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• How to resolve virtual disk degraded in Windows Server 2012

  - by harrydev

  I am using the new Storage Spaces feature in Windows Server 2012. I have the following disks: FriendlyName CanPool OperationalStatus HealthStatus Usage Size ------------ ------- ----------------- ------------ ----- ---- PhysicalDisk2 False OK Healthy Auto-Select 2.73 TB PhysicalDisk3 False OK Healthy Auto-Select 2.73 TB PhysicalDisk4 False OK Healthy Auto-Select 2.73 TB PhysicalDisk5 False OK Healthy Auto-Select 2.73 TB There is also a separate OS disk. The above disks are part of a single storage pool: FriendlyName OperationalStatus HealthStatus IsPrimordial IsReadOnly ------------ ----------------- ------------ ------------ ---------- Pool OK Healthy False False Within this storage pool some virtual disks are defined, see below: FriendlyName ResiliencySettingNa OperationalStatus HealthStatus IsManualAttach Size me ------------ ------------------- ----------------- ------------ -------------- ---- Docs Mirror OK Healthy False 500 GB Data Mirror Degraded Warning False 500 GB Work Mirror Degraded Warning False 2 TB Now the virtual disks are all running normal 2-way mirror, but two of the virtual disks are degraded. This is probably because one of the physical disks was offline for a short period of time. However, now the virtual disk cannot be repaired, even though, all physical disks are healthy. There is plenty of available space in the storage pool. This I cannot understand so I was hoping for some help, on how to resolve this? Below I have listed the full output from the Get-VirtualDisk CmdLet for the "Work" disk: ObjectId : {XXXXXXXX} PassThroughClass : PassThroughIds : PassThroughNamespace : PassThroughServer : UniqueId : XXXXXXXX Access : Read/Write AllocatedSize : 412316860416 DetachedReason : None FootprintOnPool : 824633720832 FriendlyName : Work HealthStatus : Warning Interleave : 262144 IsDeduplicationEnabled : False IsEnclosureAware : False IsManualAttach : False IsSnapshot : False LogicalSectorSize : 512 Name : NameFormat : NumberOfAvailableCopies : 0 NumberOfColumns : 2 NumberOfDataCopies : 2 OperationalStatus : Degraded OtherOperationalStatusDescription : OtherUsageDescription : Disk for data being worked on (not backed up) ParityLayout : PhysicalDiskRedundancy : 1 PhysicalSectorSize : 4096 ProvisioningType : Thin RequestNoSinglePointOfFailure : True ResiliencySettingName : Mirror Size : 2199023255552 UniqueIdFormat : Vendor Specific UniqueIdFormatDescription : Usage : Other PSComputerName :

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• Can many addon domains slow down cPanel or create problems?

  - by Marco Demaio

  I actually resell hosting plans by using one single cPanel account and many addon domains under it. Basically for each new user I don't create a new cP account, but I simply create a new ADDON domain and give him the necessary space. I know in this way the final user won't be able to manage his emails and he want be able to access all cPanel features, but that's ok. My only question is: "is there a limit on the number of cPanel addon domain that can be added?". I know in my account I'm allowed to add unlimited addon domains, but is there something that might happen that slows down cPanel or could create problems? I mean is there any suggestions you could give me about the way i'm using cPanel which might not be the usual way of using it. (As for instance: "be aware that Awstast could run very slow or crash", or "be aware that mails from different addon domains under the same cp account could create many problems.", etc.) Many thanks!

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• Determining the Source of a Given File System Mount on Unix [migrated]

  - by phobos51594

  Background Recently I have run into a bit of a snag on my home FreeBSD server. I recently upgraded it to the latest stable release, and I have noticed some strange behavior with the /var partition. Originally, I had the system configured such that /var had its own partition with /var/run and /var/log in memory disks (/tmp, too). After the upgrade, I notice there is a new, fourth memory disk mounting directly to /var that I had not set up manually and is not in my fstab. It is only 28 megs or so in size and is causing problems when trying to update my ports collection. The ramdisk mounts atuomagically at boot and cannot be unmounted while in multi-user mode. If I drop to single user mode, I am able to unmount it without issue, however rebooting causes it to pop right back up. System specifications have been included at the end of the post. Question Is there any way to determine exactly what is mounting a given memory disk (or any filesystem, for that matter) after it has been mounted? Alternately, does anybody have any ideas what might have caused the new /var ramdisk to pop up? System Specification # uname -a FreeBSD sarge 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #0: Thu Nov 22 14:02:13 PST 2012 donut@sarge:/usr/obj/usr/src/sys/GENERIC i386 # df Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/da0s1a 515612 410728 63636 87% / devfs 1 1 0 100% /dev /dev/da0s1d 515612 287616 186748 61% /var /dev/da0s1e 6667808 2292824 3841560 37% /usr /dev/md0 63004 32 57932 0% /tmp /dev/md1 3484 8 3200 0% /var/run /dev/md2 31260 8 28752 0% /var/log /dev/md3 31260 512 28248 2% /var <-- This # cat /etc/fstab # Device Mountpoint FStype Options Dump Pass# /dev/da0s1a / ufs rw,noatime 1 1 /dev/da0s1d /var ufs rw,noatime 2 2 /dev/da0s1e /usr ufs rw,noatime 2 2 md /tmp mfs rw,-s64M,noatime 0 0 md /var/run mfs rw,-s4M,noatime 0 0 md /var/log mfs rw,-s32M,noatime 0 0 Thank you in advance for any assistance.

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• split virtualization design based on environment or server role?

  - by Dan

  I'm setting up the server environment for a new software development group, which will include 4 test environments. These are web applications, so each environment will have an application server and a database server. I'm planning on buying two physical servers (e.g. 6-core CPU each with 12GB or so of RAM), and I'm thinking virtualization is appropriate here. With that in mind, I've thought of a couple ways that I could organize the virtualization strategy: - Separated by server role: Server 1 has all the application servers, each in their own guest VM. Server 2 has all the databases. OR - Separated by environment: Server 1 has a VM for two of the environments, with the VM containing both the app server and the database server. Server 2 would also contain two test environments, with the same style (app server and database in same VM). The advantages I see with all the app servers on one server and all the databases on another server is that I could probably be more efficient with the database server (one instance running multiple databases). But the other option seems easier to manage (archives/restorations would be contained in a single VM). Any recommendations? TIA.

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• iptables to block non-VPN-traffic if not through tun0

  - by dacrow

  I have a dedicated Webserver running Debian 6 and some Apache, Tomcat, Asterisk and Mail-stuff. Now we needed to add VPN support for a special program. We installed OpenVPN and registered with a VPN provider. The connection works well and we have a virtual tun0 interface for tunneling. To archive the goal for only tunneling a single program through VPN, we start the program with sudo -u username -g groupname command and added a iptables rule to mark all traffic coming from groupname iptables -t mangle -A OUTPUT -m owner --gid-owner groupname -j MARK --set-mark 42 Afterwards we tell iptables to to some SNAT and tell ip route to use special routing table for marked traffic packets. Problem: if the VPN failes, there is a chance that the special to-be-tunneled program communicates over the normal eth0 interface. Desired solution: All marked traffic should not be allowed to go directly through eth0, it has to go through tun0 first. I tried the following commands which didn't work: iptables -A OUTPUT -m owner --gid-owner groupname ! -o tun0 -j REJECT iptables -A OUTPUT -m owner --gid-owner groupname -o eth0 -j REJECT It might be the problem, that the above iptable-rules didn't work due to the fact, that the packets are first marked, then put into tun0 and then transmitted by eth0 while they are still marked.. I don't know how to de-mark them after in tun0 or to tell iptables, that all marked packet may pass eth0, if they where in tun0 before or if they going to the gateway of my VPN provider. Does someone has any idea to a solution? Some config infos: iptables -nL -v --line-numbers -t mangle Chain OUTPUT (policy ACCEPT 11M packets, 9798M bytes) num pkts bytes target prot opt in out source destination 1 591K 50M MARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 MARK set 0x2a 2 82812 6938K CONNMARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 CONNMARK save iptables -nL -v --line-numbers -t nat Chain POSTROUTING (policy ACCEPT 393 packets, 23908 bytes) num pkts bytes target prot opt in out source destination 1 15 1052 SNAT all -- * tun0 0.0.0.0/0 0.0.0.0/0 mark match 0x2a to:VPN_IP ip rule add from all fwmark 42 lookup 42 ip route show table 42 default via VPN_IP dev tun0

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• GA 8KNXP Rev1.0: 4GB installed, only 3.5 recognized by BIOS

  - by hurikhan77

  I've installed 2x 1 GB and 4x 512 MB memory into my GA-8KNXP system which would sum up to 4GB. The specs from the manual say: Maximum memory support: 4GB. If all six slots are utilized, slot 5+6 may only equipped with single-sided RAM modules. And so I did. Anyway: The BIOS counts up to 3.5 GB and finishes there. Also my linux system reports only 3.5 GB of memory although 4 GB memory support is activated in the kernel. So I suppose this is a memory mapping issue or a hardware issue. I've tried removing only on of the 512 MB memory modules leaving 5 modules in place. But that just stopped the system from powering on correctly (screen stays black although fans and leds come to live). Dual Channel was detected and enabled so the system technically found all 6 modules. "dmidecode" in linux reports only memory in slots 1 to 4 and ignores slots 5+6, so it only detects 3 GB of memory. It also says the system would support up to 16 GB of memory with 4 GB modules per slot. I think technically the chipset should be able to offer and utilize the complete 4 GB memory range. Any clues what else I could check? Or do I have just to live with 0.5 GB wasted memory?

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• What is the ideal way to set up multiple FTP enabled web accounts on Fedora?

  - by Nicholas Flynt

  I'm setting up a test server for use as a web development platform, and I'd like to mimic as closely as I can a typical shared hosting setup. That is, I'd like my server to have multple user FTP accounts, each of which links to a directory containing the webroot of the site, and I'd like apache to be able to easily see and manupulate these files. I'll admit: I'm not as familiar with Fedora as I'd like, I run Ubuntu on my home box and SElinux is giving me some grief. My initial plan was to have each user FTP into their home directory, and put the web directory there as well, but SElinux throws a hissy fit when apache tries to access anything outside of its web directory, so that plan was a no go. Would it be wise to continue this route, and perhaps mount web directories in user home folders so that FTP could still be used to access them, even though apache saw them in var/www like it expects? Would it make more sense to set up custom FTP accounts and use a single FTP user on the server box? What's the general course of action on something like this? I'm using vsftpd right now to host web directories, which is why I'm liking the home directory approach (it's simple and secure) but of course there's bound to be a better way to go about it. Thanks. (I'll leave other things, like restricted DB access and such, to another post. I'm interested right now with just getting FTP and apache to play nice in a multi-user environment.) PS: For the record, an issue I ran into when doing all of this was that if apache isn't running as the same user as the FTP account is saving as, there are permissions errors when FTP creates files, requiring the remote user to chmod the files to fix it. A logical fix would be to run apache in a special group, put all web users in this group, and have FTP access default to giving this group read/write access to everything like apache would expect, but I never could figure out how to accomplish this. Bonus points and cake if you know a solution.

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• Tridion 2011 SP1 Core Service - expose to live server within PROD env

  - by Neil

  We have a requirement to allow our users to submit information about their "projects" - a small piece of text and single image they upload. Ultimately we'll have a listing page of user contributed projects that others can comment on and rate. We've decided to user Tridion's UGC for rating & comments site-wide for this first phase which has got me thinking - UGC is tied to Tridion published pages & components, if we want UGC on our user-submitted projects, they'll have to be created within Tridion as components themselves, not be sat in some custom db table? Is this where the Core Service could come in? My understanding is that the CD Web Service is for retrieval, not for interacting with the Content Manager. Is it OK (!) architecturally to expose the Core Service only to our live application servers so our backend .NET code can create "project components" that can be then be published by editors allowing them to be commented on? Everything sounds pretty neat and tidy apart from the "exposing Core Service to live servers" bit. Without this though I'd have to write a custom way to "transfer" it back over to the Content Manager - maybe like Audience Manager Sync works? Anyone done this before?

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• adding a custom user folder on Ubuntu

  - by Narcolapser

  Question: How do you add a custom folder to the collection of user folders that come with Ubuntu? Info: I just loaded my netbook with Ubuntu Desktop 10.04LTS (Desktop because it is an aspire one and the Apocalypse seems to follow when ever i try to install netbook remix onto it). It comes with standard folders like Documents, Music, Pictures, Downloads(though this one doesn't appear until you actually download something), Videos, etc etc. These are handly little folders because they have little symbols on them and are nicely located in my file browser. it is basically like the folder lay out the windows had in vista. I do a lot of little programing on this computer so i have a folder in which i keep all these single kb code files. Obviously named "Code" that I keep in my home folder. But I would really like to it over listed next to my other user folders. In summary, how do you add a folder to the listing on the file browser. And, if possible, how do you give it an icon? (I understand fully that I will probably have to make said Icon) those two things are what I'm seeking to do. ~n P.s. please correct me if I'm using the wrong name. I just guessed and called them "User Folders" because they were folders the user uses. made sense. but if they have another name like "libraries" please say so. Thanks

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• Migrate users from one Active Directory domain to another?

  - by Matt

  I work for a company that hosts desktops for a number of different companies. At the moment, all the clients access a single domain controller called HOSTING. Under that are groups for each company. Each of the hosting servers exist on the same network and so are therefore potentially browseable by other terminal servers. This has raised some security issues and I've found it a little tricky to manage the security. As well, it's possible to see who the other hosted companies are even though other users cannot see their data. What I'd like to do is isolate each clients terminal server/s into their own VLAN. In addition, I'm thinking that each TS would have it's own DC which could just run on the TS for that company. Overhead for a DC is fairly minimal. This would isolate users on that TS from seeing the other companies completely. Firstly, does this sound like a sensible plan? Second... if it is sensible, how would I go about pulling the accounts from the HOSTING domain to a new domain? ideally, without the need for users to change their passwords?

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• Network Load Balancing and AnyCast Routing

  - by user126917

  Hi All can anyone advise on problems with the following? I am planning on installing the following setup on my estate: I have 2 sites that both have a large amount of users. Goals are to keep things simple for the users and to have automatic failover above the database level. Our Database will exist at the primary site and be async mirrored to the secondary site with manual failover procedures.The database generate sequential ID's so distributing it is not an option. I plan to site IIS boxes at both sites with all of the business logic on them and heavy operations. The connections to SQL will be lightweight and DB reads will be cached on IIS. On this layer I plan to use Windows network load balancing and have the same IP or IPs across all IIS boxes at both sites. This way there will be automatic failover and no single point of failure. Also users can have one web address regardless of which site they are in automatically be network load balanced to their local IIS. This is great but obviously our two sites are on different subnets and as this will be one IP address with most of our traffic we can't go broadcasting everything across the link between the sites. To solve this problem we plan to use AnyCast routing over our network layer to route the traffic to the most local box that is listening which will be defined by the network load balancing. Has anyone used this setup before? Can anyone think of any issues with this? Also some specifics I can't find anywhere at the moment. If my Windows box is assigned an IP and listening on that IP but network load balancing is not accepting specific traffic then will AnyCast route away from that? Also can I AnyCast on a socket level?

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• Turn Excel spreadsheet into a formula

  - by ?????? ??????????

  I have an Excel spreadsheet that has a complex computation that is not trivial to turn into a macro or a single-cell formula. The spreadsheet has a about 10 different inputs (values a human enters in different cells of the spreadsheet) and then it outputs 5 independent calculations (in different 5 cells) based on that input. There calculation is using some pre-entered data in the spreadsheet (about 100 different constants) and doing some look-ups on them. Now I would like to use this whole spreadsheet as a formula on a different spreadsheet to calculate a set of input values and produce the corresponding set of output values. Imagine this as creating different table with 10 columns for the input variables and 5 columns for the outputs, then copying each input into the other spreadsheet and copying back the output in the results table. For instance: - A1, A2, A3,... A10 are cells where someone enters values - through a series of calculations B1, B2, B3, B4 and B5 are updated with some formulas Can I use the whole series of calculations from A1..A10 into B1..B5 without creating one massive huge formula or a VBA macro? I want to have a set of input values in 100 rows from A100, B100, C100,... J100 onward. Then do some Excel magic that will: 1. copy the values from A100...J100 into A1 to A10 2. wait for the result to appear in B1 to B5 3. copy the values from B1 to B5 into K100 to O100 4. repeat steps 1 to 3 for all rows from 100 to 150

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• Removing/modifying LDAP objectclasses/attributes using olc

  - by Foezjie

  I'm having trouble using openldap's olc to modify a schema without shutting down the server. To test some things out, I made the following schema: objectIdentifier tests orgUlyssisOID:4 objectIdentifier testAttribute tests:1 objectIdentifier testObjectClass tests:2 attributeType ( testAttribute:1 NAME 'attr1' DESC 'attribuut 1' SYNTAX '1.3.6.1.4.1.1466.115.121.1.40' ) attributeType ( testAttribute:2 NAME 'attr2' DESC 'attribuut 2' SUP userPassword SINGLE-VALUE ) objectclass ( testObjectClass:1 NAME 'class1' DESC 'objectclass 1' SUP top STRUCTURAL MUST (attr1 $ attr2 ) ) And added it to a new schema called test. (cn={9}test.ldif in cn=schema). Now I can't seem to figure out how to delete class1 from that schema. I use the following LDIF (and tried lots of variations too, to no avail) dn : cn={9}test,cn=schema,cn=config changetype: modify delete: olcObjectClasses olcObjectClasses: ( testObjectClass:1 NAME 'class1' DESC 'objectclass 1' SUP top STRUCTURAL MUST ( attr1 $ attr2 ) ) Running ldapmodify -x -W -D cn=admin,cn=config -f test.ldif -d 0 gives no output. -d 1 gives this: ldap_create ldap_sasl_bind ldap_send_initial_request ldap_new_connection 1 1 0 ldap_int_open_connection ldap_connect_to_host: TCP localhost:389 ldap_new_socket: 4 ldap_prepare_socket: 4 ldap_connect_to_host: Trying 127.0.0.1:389 ldap_pvt_connect: fd: 4 tm: -1 async: 0 ldap_open_defconn: successful ldap_send_server_request ber_scanf fmt ({it) ber: ber_scanf fmt ({i) ber: ber_flush2: 38 bytes to sd 4 ldap_result ld 0x7f2a8ccf3430 msgid 1 wait4msg ld 0x7f2a8ccf3430 msgid 1 (infinite timeout) wait4msg continue ld 0x7f2a8ccf3430 msgid 1 all 1 ** ld 0x7f2a8ccf3430 Connections: * host: localhost port: 389 (default) refcnt: 2 status: Connected last used: Mon Sep 10 11:29:57 2012 ** ld 0x7f2a8ccf3430 Outstanding Requests: * msgid 1, origid 1, status InProgress outstanding referrals 0, parent count 0 ld 0x7f2a8ccf3430 request count 1 (abandoned 0) ** ld 0x7f2a8ccf3430 Response Queue: Empty ld 0x7f2a8ccf3430 response count 0 ldap_chkResponseList ld 0x7f2a8ccf3430 msgid 1 all 1 ldap_chkResponseList returns ld 0x7f2a8ccf3430 NULL ldap_int_select read1msg: ld 0x7f2a8ccf3430 msgid 1 all 1 ber_get_next ber_get_next: tag 0x30 len 12 contents: read1msg: ld 0x7f2a8ccf3430 msgid 1 message type bind ber_scanf fmt ({eAA) ber: read1msg: ld 0x7f2a8ccf3430 0 new referrals read1msg: mark request completed, ld 0x7f2a8ccf3430 msgid 1 request done: ld 0x7f2a8ccf3430 msgid 1 res_errno: 0, res_error: <>, res_matched: <> ldap_free_request (origid 1, msgid 1) ldap_parse_result ber_scanf fmt ({iAA) ber: ber_scanf fmt (}) ber: ldap_msgfree ldap_free_connection 1 1 ldap_send_unbind ber_flush2: 7 bytes to sd 4 ldap_free_connection: actually freed So no real indication of an error. Where am I doing it wrong? Bonus question: If I have some entries of a certain objectclass, can I modify it (add/remove attributeTypes) without removing the entries? Thanks in advance for all help.

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• Why does my exchange message filtering rule not work?

  - by Jon Cage

  I have two rules set up to sort incoming bug reports. The first is specific to a single device: Apply this rule after the message arrives sent to SMS Distribution and with <source_device_number>: in the body move it to the BugReports\<source_device_number> folder ..and the second is a catch-all for everything else: Apply this rule after the message arrives sent to SMS Distribution move it to the BugReports folder For some reason though, the first rule never seems to act even though it's higher in the list. So for some reason an email like the following doesn't seem to get caught by the first rule: From: <SourceDeviceUID> To: SMS Distributor Subject: Message from <SourceDeviceUID> Message: <source_device_number>: Device encountered a problem. Details below... ...where <source_device_number> is an integer. The second rule works fine. But for some high-priority devices, I want them automatically sorted. Why might that first rule fail?

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• Daisy-chainable DisplayPort Monitors

  - by thepurplepixel

  I am the proud new owner of a MacBook Pro with a mini-DisplayPort. My desk setup used to allow me to position the screen of my old MacBook beside an external monitor, essentially allowing dual-head. It was also advantageous that my old MBP and my external monitor had the same resolution, 1440x900. Now, I'm searching for a set of two monitors that I can use a HengeDock with. Unfortunately, the MacBook Pro suffers from having only one mini-DisplayPort. Looking up the spec for DisplayPort 1.2 (which the MBP supports), DisplayPort daisy chaining is supported. What I'm looking for is a monitor that has two DisplayPorts so I can daisy chain two monitors off the single mini-DisplayPort. What I don't want is a USB-based video solution. I need full acceleration on both monitors; an external video card won't cut it. I hope I don't have to wait a few years for these monitors to come out. TL;DR: I need two monitors with two DisplayPorts each that I can daisy-chain. Thanks!

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• Apache httpd processes and PHP out of memory

  - by Ofri

  I have a VPS running apache-php-mysql on centos and a single drupal website installed. The VPS has 256MB of RAM (could be the root cause of all my problems... maybe I just need more). Whenever I try to open my website from multiple browser tabs (about 8... not 800) all at once, apache crashes! I have this on the log: [Wed Oct 24 11:26:31 2012] [error] [client xxx] PHP Fatal error: Out of memory (allocated 28049408) (tried to allocate 201335 bytes) in xxx on line 2139, referer: xxx I have read many many posts here, but I think there is something fundamental that I'm missing - If I understand correctly some php script tried to allocate 200K after allocating 28MB, and fails to do so. First question is: should this cause the apache to crash??? Next, I tried to look at 'top' command while I do my little test. Indeed I see 7 httpd processes, each reserving about 30MB - which explains why my RAM runs out. How do I prevent apache from creating new processes until it's out of memory? I tried configuring /etc/httpd/conf/httpd.conf like this: <IfModule prefork.c> StartServers 1 MinSpareServers 1 MaxSpareServers 1 ServerLimit 1 MaxClients 1 MaxRequestsPerChild 100 </IfModule> But got the same exact result! What am I missing? Thanks a lot!

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• 2011 i7 Macbook Pro unable to boot from any Windows CD?

  - by Craig Otis

  I'm encountering issues installing Windows alongside my Lion install. I'm attempting to install from the internal SuperDrive, after using Boot Camp to partition what was a single, HFS+ volume. When holding down Option at boot, the CD appears in the startup list, but upon selecting it, I get a gray screen for 5 minutes, then a flashing white folder. I tried installing rEFIt and using this to boot the CD, but I receive an error about "Not Found" being returned from the "LocateDevicePath", and a mention of the firmware not supporting booting using legacy methods. In the Console, when opening the StartupDisk preference pane (which never presents the CD as a selectable option), I see: 11/25/11 4:39:31.159 PM System Preferences: isCDROM: 0 isDVDROM:1 11/25/11 4:39:31.159 PM System Preferences: mountable disk appeared: /Volumes/GRMCPRFRER_EN_DVD 11/25/11 4:39:33.214 PM System Preferences: - So far so good, passing disk to System Searcher. 11/25/11 4:39:33.218 PM System Preferences: OSXCheck: No boot.efi in System Folder or volume root. 11/25/11 4:39:33.220 PM System Preferences: WinCheck: Not a valid windows filesystem: /Volumes/GRMCPRFRER_EN_DVD 11/25/11 4:39:33.220 PM System Preferences: WinCheck: Not a valid windows filesystem: /Volumes/GRMCPRFRER_EN_DVD I'm at a loss here. I've done my research, but it sounds like most of the rEFIt errors of this nature are caused by installing from a thumbdrive, or an external drive. I'm using the internal SuperDrive. Also, I've tried this with two different disks: A Windows XP SP2 CD A Windows 7 x86 DVD Both are disks I've had around for years, and I've used them reliably in the past. The system is an early 2011 15" Macbook Pro, all firmware updates installed.

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• v2v of RHEL5 box - issues with retaining MAC address

  - by Alex Berry

  For the last week we have been troubleshooting a customer's Red Hat Virtual Machine running on ESXi. We've been using Veeam to try to create a replica off-site and have been having getting it to work on a decent schedule and recently we noticed that there were issues with orphaned snapshots while looking at the datastore. You can see several snapshots in the same folder and it's causing issues with replication and backup, so we decided the cleanest way was to v2v the machine to another datastore so that we had a clean single-vmdk setup to work with, this is where our trouble started. We first started off with a v2v using vmware converter and connecting to the powered on machine as we were having issues doing an offline v2v. This copied fine but when I tried to set a static MAC using this article http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=507 the new VM wouldn't take the address, it simply obtained a new MAC, received a dhcp lease and then would only boot up to a blank red screen, never the login screen. So the next step was to do an offline v2v, once we finally got it working. Same thing, followed the kb to the letter and still it wouldn't take the MAC. I then tried it again and upon completion I compared both old and new VMX file, copying every identifier and variable possible, then unregistered both VMs, uploaded the new VMX file and booted, only to see the same results. Finally I did the same as above but I copied the disk using DD to a second attached vmdk and then attached this to the new VM, and still no luck. After downloading the modified VMX file after the first boot and comparing it to the original I created I found that the bios uuid had changed from the one I typed in manually, so I'm assuming this may be the snagging point, but I have no idea. I've never had this issue before on a P2V and I'm just wondering if someone could shed some light on this, maybe it's to do with RHEL licencing?

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• Website hosting from home - IIS6

  - by Paul

  I'm wanting to host a few websites from home, primarily because I'm using some BETA Microsoft software (.NET 4 and EF) and don't want to install it on my production server which is hosted at eukhost.com. Basically, I'm completely new to this sort of thing. So far, here is what I've done: Registered the domain name at namecheap.com (let's call it mydomain.com) Gone to "Nameserver Registration" in the panel and entered my IP address for the NS1 and NS2 records (let's say the IP is 0.0.0.0). Gone to "Domain Name Server Setup" and entered ns1.mydomain.com & ns2.mydomain.com Forwarded requests from port 80 to my internal IP (let's say 192.168.1.254) Created the website in IIS (I'm just testing with a single website so far, so have not created any host header values) Now, if I type in the IP address (http://0.0.0.0) I get the site as expected. However, if I enter http://www.mydomain.com I get an error saying "DNS Error - Cannot find server". I'm aware that there is a service from DynDNS that will automatically change the IP if I have a dynamic address, however my IP has remained static since I installed the ISP (since October) so I don't need this. Is there any way that I can get the DNS to work just by configuring IIS or something in Windows? I don't really want to have to pay for any 3rd party service. Thanks,

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• WWNs,WWPNs and Fibre Channel addresses

  - by user238230

  Lots of contradictory on these subjects and I don't know why. My first question is about the 64 bit WWN. One reference claims the terms WWN and WWPN are synonymous. An online source seems to refute this. They say: A WWPN (world wide port name) is the unique identifier for a fibre channel port where a WWN (world wide name) the unique identifier for the node itself. A good example is a dual port HBA. There will be two WWPN's (one for each port) and only a single WWN for the card itself. Question #1: Which is correct? I’m almost positive I read that every “Port” has a WWN. My next question is about the 24 bit FC address that is dynamically allocated to a port when it is introduced to the switch. The Domain ID field is defined as: "a unique number provided to each switch in the fabric." Question #2: Do Domain IDs only apply to switch ports? For example what would the Domain ID be for a HBA? None? The same as the switch port it is connected to? Question #3: My last question is about the Name Server of a switch. A book example shows the routing of a message through the switch. It uses the WWNs of the source and destination ports to route the message. I am assuming that the Name Server must associate the WWN and the FC address in some way in order to route the message, correct?

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• TCP Server Memory management: #Connections Vs. #Requests

  - by Andrew

  Given that, there is no theoretical limit to number of concurrent TCP connections a Windows 2008 server can handle. Only thing will happen is, with each connection there will be memory consumption in server. Unfortunately, memory is not unlimited (and I want to utilize only physical memory). For example, lets say we've 2GB server memory. Now there are two extreme cases: Case 1: If we've allocated 64KB buffer for each connection (only to receive incoming request), then 32768 connections can consume all the 2GB of memory. This will not leave any memory to queue/process incoming requests from those connections. Case 2: On the other hand, lets say a single (or very few) connections continuously keeps sending request buffers (for example, video streaming from one connection to other) and server cannot process them within time, those buffers will get piled up in server and eventually will occupy most of the servers memory. And it will not leave any memory for new connection thereafter. This is the real dilemma in server design bugging me badly for last many days. If I can decide on max size of request buffer per connection and max number of requests to allow in queue per connection. Then, based on available server memory, it will then automatically set limit on max number of concurrent connections. How to decide on these limits to achieve best performance and throughput? I am just looking for perfect utilization of server resources. Are there any standard guidelines or empirical data available with someone who can share with me please.

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• How to take screenshots of WPF applications in correct size and content

  - by Thomas W.

  I usually take screenshots of single windows via the built-in key combination Alt+Print. Unfortunately this does not work well for more and more applications - all of them are WPF applications. Usually the screen shots have at least one of the following properties: the screenshot is larger than expected and contains parts of the screen around the actual window the screenshot has the correct size but includes parts of other windows, e.g. the Windows task bar. Of course the task bar might be in front of the window, but taking screen shots of "normal" programs works fine. How do I take screenshots of WPF application which are correct in size and content? I'd like to avoid the extra effort of checking all the screenshots for correctness, reproducing the situation, taking them again in case of issues or repairing/faking them manually in any pixel manipulation program (e.g. Paint.NET). I observe this on Windows 7 x64 SP 1, all official updates installed, but it might apply to other Windows versions as well (not tested yet). .NET 4.5 is installed. The application itself might only need the built-in .NET 3.5.1. It's reproducible on a virtual machine with the same settings. Examples: Screenshot of an application running in maximized mode. The screen shot includes parts of the task bar. Screenshot of a progress dialog which is behind the task bar. The screenshot also includes the task bar, while it doesn't for non WPF applications.

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• Vista Screen resolution Changes when Switching Users

  - by Benjol

  I regularly have a problem when switching between users in Vista - the screen resolution drops down to 800x600. If I try to set the resolution back to the maximum, it says nothing, but just keeps it at 800x600. I can set it back to an intermediate value. Otherwise I have to either restart the PC, or sometimes if I log off one of the users, I can then set the resolution back to max. Might it also have something to do with using sleep mode instead of performing regular shutdowns? I thought it might be related to the desktop background image taking up too much space, but even with plain colours, the problem still occurs. There is an enormous thread on this here, but not really any answers. From what I can gather from that thread, it isn't related to any particular applications, nor limited to a particular make of graphics card or monitor, so I don't think that including hardware details is useful. This is a very annoying problem, as it screws up my desktop and screen layout every single time. Has anyone here experienced this problem or found a solution? I've noticed that Windows Update has tried to install nVidia updates and apparently they've failed on several occasions. Not sure if that is of any relevance or not. UPDATE The last post on the thread: FWIW - I had this problem for about 2 years and wrote a number of posts in this thread in the past. It survived OS reinstallation, change of practically all of my hardware piece by piece (mobo, cpu, monitor, graphics card, memory, power supply...) I used to be affected by this annoying problem at least once every 24-48 hours. About 1.5 months ago I wiped out my 32 bit vista ultimate installation and installed Windows7 ultimate 64 bit from scratch and never saw this problem again. GOOD RIDDANCE. Vista was a pathetic piece of __ that felt like a flashback to the old [horrible] NT4/Windows95 days. I was seriously considering switching over to Apple/Mac OSX if this problem persisted.

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• iptables to block VPN-traffic if not through tun0

  - by dacrow

  I have a dedicated Webserver running Debian 6 and some Apache, Tomcat, Asterisk and Mail-stuff. Now we needed to add VPN support for a special program. We installed OpenVPN and registered with a VPN provider. The connection works well and we have a virtual tun0 interface for tunneling. To archive the goal for only tunneling a single program through VPN, we start the program with sudo -u username -g groupname command and added a iptables rule to mark all traffic coming from groupname iptables -t mangle -A OUTPUT -m owner --gid-owner groupname -j MARK --set-mark 42 Afterwards we tell iptables to to some SNAT and tell ip route to use special routing table for marked traffic packets. Problem: if the VPN failes, there is a chance that the special to-be-tunneled program communicates over the normal eth0 interface. Desired solution: All marked traffic should not be allowed to go directly through eth0, it has to go through tun0 first. I tried the following commands which didn't work: iptables -A OUTPUT -m owner --gid-owner groupname ! -o tun0 -j REJECT iptables -A OUTPUT -m owner --gid-owner groupname -o eth0 -j REJECT It might be the problem, that the above iptable-rules didn't work due to the fact, that the packets are first marked, then put into tun0 and then transmitted by eth0 while they are still marked.. I don't know how to de-mark them after in tun0 or to tell iptables, that all marked packet may pass eth0, if they where in tun0 before or if they going to the gateway of my VPN provider. Does someone has any idea to a solution? Some config infos: iptables -nL -v --line-numbers -t mangle Chain OUTPUT (policy ACCEPT 11M packets, 9798M bytes) num pkts bytes target prot opt in out source destination 1 591K 50M MARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 MARK set 0x2a 2 82812 6938K CONNMARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 CONNMARK save iptables -nL -v --line-numbers -t nat Chain POSTROUTING (policy ACCEPT 393 packets, 23908 bytes) num pkts bytes target prot opt in out source destination 1 15 1052 SNAT all -- * tun0 0.0.0.0/0 0.0.0.0/0 mark match 0x2a to:VPN_IP ip rule add from all fwmark 42 lookup 42 ip route show table 42 default via VPN_IP dev tun0

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• iMac 20inch (Mid 2007) SL DVD Boot Prohibitory Sign

  - by Caitlann Lloyd

  iMac 20inch (Mid 2007 Build) with Ubuntu 12.0.4 How I got in this situation I had a perfectly healthy Intel iMac running Snow Leopard several months ago. Then I got the dreaded spinning gear and several kernel panics. After getting a little frustrated (failing to find a solution online), I found an old macbook installation disk and used it to access Disk Utility. From here, I erased my entire hard drive leaving me with no OS. I then created a Ubuntu DVD and installed Ubuntu onto the system. Now, on Ubuntu, I wine installed Transmac and burned a Single layer copy (with languages, etc. removed to save space) of Snow Leopard onto a 4.7GB DVD. I tried to boot from it and was met with first the grey apple screen and a spinning cog before the grey apple shortly turned into the infamous prohibitory sign. Note: I met this problem previously when using Disk Utility to create a bootable USB of Snow Leopard, hence I severely doubt it has anything to do with the DVD created. Resources at my disposal 1 x iMac running Ubuntu 6 x 4.7GB DVDs 1 x USB Stick 12GB 1 x Windows 7 Laptop Resources I do not have Firewire cables Access to a prebuilt retail disk (Misplaced) Access to another Mac Apple Warranty I would be hugely grateful if someone was able to tell me how to install Snow Leopard again.

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