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• Wireless Network Issue, Disconnecting Randomly From Network

  - by Surfer513

  I'm having an odd problem with my wireless network. Here is the background information: Server (Windows Server 2008) 1 to 10 end user machines connecting to the network Layer 3 Access Point (Asus WL-330 gE) connected to ethernet of Server and all machines connect to the network via the AP The end user machines get a connection to the server with no problems initially. But then connections are randomly lost throughout the day to the server/network. The wireless NICs of the machines still see the wireless network but are unable to connect to it. Then after some time the connection is regained automatically. I initially thought there was a problem with this particular AP, but then I took the same make/model AP out of storage and still ran into the problem. Any ideas what could be causing this??? Very confusing that the wireless nics on the end user machines can still see the network but not connect, and that the connections are randomly lost/gained. Thanks in advance!

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• Recover a lost IBM DS4300 SAN password?

  - by Daniel

  I have a pair of IBM DS4300 SAN units that I need to perform a firmware upgrade on. Unfortunately the admin passwords on these units have been lost and now need to be reset. I had hoped the default password of 'infiniti' would work but it seems that it must have been changed. I know the method here is to contact IBM but the cost of that phone call is ludicrous if someone out here knows what they're going to tell me to do. These units are out of warranty and the cost of support is beyond what we have the budget for. Is there an interrupt I can enter during the boot process (similar to a cisco password recovery) or is there a hardware/software tool I require? Please, if anyone has ever gone through the process of an IBM password recovery I’m asking for a little help. EDIT: Just to clarify, the password I need to reset is the one used for serial cable access and not for storage manager. Sorry if I have caused more confusion.

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• Directory name for non-generic Proprietary stuff

  - by George Bailey

  Is there a common or standard directory name for the company-specific stuff that exists in a server? This would include any crons, scripts, webserver docroots, programs, non-database storage areas, service codebases, etc. We could of course put crons in /etc/cron.d, put docroots in /home/webservd, scripts in one of the bin directories, but that would be messy. If XYZ Technology Corp wanted to have all the non-generic stuff in one place, would they make a directory /xyz or /home/xyz or is there an alternative directory name that is not company-specific, but intended for company-specific stuff? What is most common?

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• what is acceptable datastore latency on VMware ESXi host?

  - by BeowulfNode42

  Looking at our performance figures on our existing VMware ESXi 4.1 host at the Datastore/Real-time performance data Write Latency Avg 14 ms Max 41 ms Read Latency Avg 4.5 ms Max 12 ms People don't seem to be complaining too much about it being slow with those numbers. But how much higher could they get before people found it to be a problem? We are reviewing our head office systems due to running low on storage space, and are tossing up between buying a 2nd VM host with DAS or buying some sort of NAS for SMB file shares in the near term and maybe running VMs from it in the longer term. Currently we have just under 40 staff at head office with 9 smaller branches spread across the country. Head office is runnning in an MS RDS session based environment with linux ERP and mail systems. In total 22 VMs on a single host with DAS made from a RAID 10 made of 6x 15k SAS disks.

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• Finding all IP ranges blelonging to a specific ISP

  - by Jim Jim

  I'm having an issue with a certain individual who keeps scraping my site in an aggressive manner; wasting bandwidth and CPU resources. I've already implemented a system which tails my web server access logs, adds each new IP to a database, keeps track of the number of requests made from that IP, and then, if the same IP goes over a certain threshold of requests within a certain time period, it's blocked via iptables. It may sound elaborate, but as far as I know, there exists no pre-made solution designed to limit a certain IP to a certain amount of bandwidth/requests. This works fine for most crawlers, but an extremely persistent individual is getting a new IP from his/her ISP pool each time they're blocked. I would like to block the ISP entirely, but don't know how to go about it. Doing a whois on a few sample IPs, I can see that they all share the same "netname", "mnt-by", and "origin/AS". Is there a way I can query the ARIN/RIPE database for all subnets using the same mnt-by/AS/netname? If not, how else could I go about getting every IP belonging to this ISP? Thanks.

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• SD to PCI adapter

  - by vy32

  We are looking for a way to plug a SD card into a PCI slot without going through a USB interface. We want to read the SD card's serial number directly and issue SD commands. The Chumby and the Google Android G1 phones both have SD slots that you can read from Linux without going through USB, but the Chumby only has a single SD card that's used for booting, and the G1 doesn't have any other reasonable storage if you use the SD card for that purpose. I'd really like a desktop with a few SD slots that are directly accessible. Anybody know of anything??

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• ipvsadm lists a few hosts by IP only, rest by name

  - by dmourati

  We use keepalived to manage our Linux Virtual Server (LVS) load balancer. The LVS VIPs are setup to use a FWMARK as configured in iptables. virtual_server fwmark 300000 { delay_loop 10 lb_algo wrr lb_kind NAT persistence_timeout 180 protocol TCP real_server 10.10.35.31 { weight 24 MISC_CHECK { misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.31" misc_timeout 30 } } real_server 10.10.35.32 { weight 24 MISC_CHECK { misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.32" misc_timeout 30 } } real_server 10.10.35.33 { weight 24 MISC_CHECK { misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.33" misc_timeout 30 } } real_server 10.10.35.34 { weight 24 MISC_CHECK { misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.34" misc_timeout 30 } } } http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.fwmark.html [root@lb1 ~]# iptables -L -n -v -t mangle Chain PREROUTING (policy ACCEPT 182G packets, 114T bytes) 190M 167G MARK tcp -- * * 0.0.0.0/0 w1.x1.y1.4 multiport dports 80,443 MARK set 0x493e0 62M 58G MARK tcp -- * * 0.0.0.0/0 w1.x1.y2.4 multiport dports 80,443 MARK set 0x493e0 [root@lb1 ~]# ipvsadm -L IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn FWM 300000 wrr persistent 180 -> 10.10.35.31:0 Masq 24 1 0 -> dis2.domain.com:0 Masq 24 3 231 -> 10.10.35.33:0 Masq 24 0 208 -> 10.10.35.34:0 Masq 24 0 0 At the time the realservers were setup, there was a misconfigured dns for some hosts in the 10.10.35.0/24 network. Thereafter, we fixed the DNS. However, the hosts continue to show up as only their IP numbers (10.10.35.31,10.10.35.33,10.10.35.34) above. [root@lb1 ~]# host 10.10.35.31 31.35.10.10.in-addr.arpa domain name pointer dis1.domain.com. OS is CentOS 6.3. Ipvsadm is ipvsadm-1.25-10.el6.x86_64. kernel is kernel-2.6.32-71.el6.x86_64. Keepalived is keepalived-1.2.7-1.el6.x86_64. How can we get ipvsadm -L to list all realservers by their proper hostnames?

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• XenServer 5.5 Error adding additional Server to Ressource Pool

  - by SideShowCoder

  I'm running Citrix XenServer 5.5 as a testsetup, with Openfiler providing Storage via NFS. I tried to setup a Ressource Pool to test Live migration but I'm unable to a my 2. Server to the Pool. It fails after about 10sec with the Error: 4/26/2010 2:54:52 PM Error: Adding server 'u-173-c047.XXX.XXX' to pool 'Portland' - Internal error: Stunnel.Stunnel_error("") I'm kind of lost right now where to look whats causing this, and the Error is not really of any help. Are there logs availible somewhere besides in XenCenter, which might be helpful? Any Ideas what is causing this? Thanks

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• Best way to automatically synchronize files between Linux and Windows

  - by Gregory

  My first choice was rsync but it caused some issues and is too manual. My second choice, currently under evaluation is Unison. Are there any other good options for bi-directional auto-syncing? The synching tool cannot add it's own files to the directories to be synched. Which removes CVS/SVN as a choice. Plus they are too manual. The requirements are user-level program on both sides, no root account access available. Only scanning on linux. On windows it could be a virtual drive/path. Very fast and efficient like rsync. Some other requirements include: machines are not on the same network, files cannot fall into the wrong hands, nor can they be handled by 3rd parties, this pretty much excludes all online storage sites.

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• Can single ESXi host make use of two separete iSCSI box?

  - by user71061

  Hi! I have problem with using multiply iSCSI targets with single ESXi host (in my case they are two FreeNAS hosts, but I suspect that this problem will occur with any two iSCSI box of that same type/model). If I configure two FreeNAS hosts as iSCSI targets (say iSCSI A and iSCSI B), then I can use both of them with my ESXi host, but only one at a time (i.e only iSCSI A or only iSCSI B, but not both of them simultaneously). If I try to add second iSCSI target to my iSCSI adapter (of course it has unique iqn name), then in a details pane of this adapter (it is iSCSI software adapter), I see that total number of paths has increased accordingly, but not total number of devices (so I can't use it as another storage). What should I do? It is impossible to attach two iSCSI targets to single adapter? I'm using free version of ESXi 4.1. Maybe it is an limitation of free version? Thanks in advance for any sugestion.

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• Can you use a USB hard drive in ESXI?

  - by semi

  I know that you can install ESXi 4.0 on a thumbdrive, but I was wondering if you could plug in an external harddrive to give extra storage to one of your VMs? We run a fileserver inside of ESXi that needs a space upgrade, but we're thinking of migrating to a different fileserver solution and would rather stick to external media to ease the later transition. edit: Ideally I'd like the drive to show up to the VM directly and not have ESXi control it, so that I could move it to a different machine and still have all of the data appear the same.

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• How to understand the LSI HBA connector specs?

  - by Sandra

  When reading the specifications for the LSi SAS 9206-16e HBA, it says Storage Connectivity; Data Transfer Rates * 16 ports; 6Gb/s SAS 2.1 compliant SAS Bandwidth * Half Duplex 2400MB/s, x4, 6Gb/s SAS lanes Port Configurations * 16 ea, x1 ports (individual drives) * 4 ea, x4 wide ports * 2ea, x8 wide ports Connectors * Four (x4) mini-SAS HD external connectors (SFF8644) So there are 4 physical connectors. Question What is the bandwidth for each of the connectors? I would be temped to say 6Gb/s * 4, but then it mentions the "Port Configurations" and 2ea, 4ea, 16ea, which I don't understand what is. Does this mean, that the 4 physical connectors are not identical?

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• best practice to removing DC from Site that no longer connects via vpn in another city

  - by dasko

  hi i am looking for a recap of what i have done already to see if i missed anything. i had two cities connected by wan using a ipsec persistent tunnel between gateways. i had one DC (DOMAIN CONTROLLER) in each city that was a global catalog server (GC) they were set up to replicate and i had them configured under Sites and Servers with their own subnet etc... about 6 months ago the one city was removed and i was not able to gracefully remove, through dcpromo, the server that was there. it is no longer used and cannot be brought back. the company went from two sites down to single site. Problem is i had a whole bunch of kcc errors and replication bugs in the event viewer. i wanted to clean up my active directory and decided to use the ntdsutil metadata cleanup commands. i removed the server from the specifed site based on a procedure from petri website. I then removed the instances of the old DC and site from Sites and Servers. Then i went and cleaned up the DNS by removing Host A records, NS server name from both the local DNS forward lookup zone and the _msdcs i also removed the reverse lookup zone for the subnet that no longer exists. is there anything i missed? thanks in advance for any help. gd

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• Private cloud solution [Eucalyptus,OpenStack, Nimbus] for Java deployments [Glassfish, Tomcat]

  - by Tadas D.

  I am interested in a way to have private cloud which would host Glassfish (or Tomcat) server. Which option from Eucalyptus, Openstack or Nimbus would be best to deploy java applications on it? Or maybe there is something other and I am looking wrong at the problem? The way I imagine this, that I should have some shared storage that I could expand by introducing new nodes to this cluster and have easy management for glassfish instances: something like virtual machines images that I can start and stop on demand and that image is shared among nodes. I don't need concrete step-by-step solution here but guidelines how this should be done are very welcome.

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• Dedicated NIC or dedicated port for iSCSI?

  - by Newt

  When spec'ing and configuring a machine that will utilise shared iSCSI storage, I've read a lot of documentation which suggests a dedicated network adapter should be used for iSCSI communication. That makes a lot of sense and I have no problem with it. The question I do have, is this - should that suggestion be taken to mean that a separate physical NIC should be used, or will a dedicated port/ports on a dual/quad port NIC be just as good? My suspicion is that simply using dedicated port(s) on a shared NIC would be just as good. Any input greatly appreciated.

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• Can I use a SD card as cache instead of a Solid State Drive

  - by user654628

  I just installed a solid state drive a few days ago and I have been reading about how to preserve the file of it. I am running Windows 8 and my SSD has 256G of storage. I am using a laptop and cannot carry an external hard drive connected to my laptop to hold cache, temp files etc. I was wondering if a SD card would work. So I would use the SD card to hold cache, temp files and maybe index files from Windows, would this work and be effective (since I believe sd cards will also wear out)?

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• Does this file format exist?

  - by Jon Chase

  Is there a file format that handles the following use case... I'd like to create a tar file (or whatever - I'm just using tar here b/c it's a well known file format for containing multiple files) that would be usable even if I only had access to specific chunks of said file. For example, say I tar up my mp3 and photo collection into a 100GB tar file, then put the file into some long term storage somewhere. Later, I want to access a specific mp3 file. I don't want to download the entire 100GB tar file just to get to one mp3. In fact, let's say I can't download the entire 100GB tar file. Instead, I'd like to say "give me megabytes 10 through 19 of the 100GB tar file" and then have the mp3 magically extracted from those 10 megabytes. Does a file format like this exist?

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• solaris zpool SSD cache device "faulted"

  - by John-ZFS

  I am trying to get over these SATA SSD errors - smartctl command failed to read the SATA SSD - SATA is not supported what could be the reason for errors? does this mean that SSD has reached EOL & needs to be replacement? errors: No known data errors pool: zpool1216 state: DEGRADED status: One or more devices are faulted in response to persistent errors. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Replace the faulted device, or use 'zpool clear' to mark the device repaired. scan: scrub repaired 0 in 0h24m with 0 errors on Fri May 18 14:31:08 2012 config: NAME STATE READ WRITE CKSUM zpool1216 DEGRADED 0 0 0 raidz1-0 ONLINE 0 0 0 c11t10d0 ONLINE 0 0 0 c11t11d0 ONLINE 0 0 0 c11t12d0 ONLINE 0 0 0 c11t13d0 ONLINE 0 0 0 c11t14d0 ONLINE 0 0 0 c11t15d0 ONLINE 0 0 0 c11t16d0 ONLINE 0 0 0 c11t1d0 ONLINE 0 0 0 c11t2d0 ONLINE 0 0 0 c11t3d0 ONLINE 0 0 0 c11t4d0 ONLINE 0 0 0 c11t5d0 ONLINE 0 0 0 c11t6d0 ONLINE 0 0 0 c11t7d0 ONLINE 0 0 0 c11t8d0 ONLINE 0 0 0 c11t9d0 ONLINE 0 0 0 logs c9d0 FAULTED 0 0 0 too many errors cache c10d0 FAULTED 0 17 0 too many errors

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• Differencing Disks in VirtualBox

  - by PhilPursglove

  I'm struggling to understand how to do differencing disks in VirtualBox v3.1.0. I've created a Windows 2008 Server, but now I want to use that as a base image for a number of other servers. The help file has a description of what differencing disks are, but I can't find where it actually tells you how to do it. In the Storage dialog for a server I found the Differencing Disks checkbox: but when I check it, I'd expect it to then ask which image should be the parent so I could select my base image. Any pointers you can offer would be greatly appreciated!

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• Does the Win XP/7 dual boot "missing restore points" problem apply to systems with separate hard disks for each O/S?

  - by Robert Oschler

  I'm in the process of installing Windows 7/64 on a system with Windows XP/32 on it. During my research, I read about a problem that occurs in the dual boot scenario where Windows XP deletes Windows 7's restore points when it accesses the Windows 7 volume: http://support.microsoft.com/kb/926185 I found a workaround but it seems pretty painful since it appears to involve using the registry to make the Windows 7 volume appear invisible or "offline" to Windows XP, making sharing disk data between the two O/S annoying since you have to use something like an external storage device to get it done: http://www.vistax64.com/tutorials/127417-system-restore-points-stop-xp-dual-boot-delete.html I was wondering if this problem only occurs with systems that have both O/S installed on the same physical hard drive (in different partitions)? In my case, I will have each O/S on a completely separate physical hard drive. Any other tips would be appreciated. -- roschler

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• grow/shrink a zfs RAIDZ

  - by c2h2

  I'm going to build a freenas server, would like to make sure what I can do with such magical and advanced zfs. If I have 5 * 3TB disks in RAIDZ (12TB storage in total), now I am trying to add another 2 * 3TB disks to this existing array. Q: Am I able to do it without affect/touch any existing data on RAIDZ volume? What about take away some existing disk? say take away 1 disk out of the 5 disks, assuming only very small portion of data exists on the raidz.

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• How can I recover a huge folder that's been converted to a zero kb file on an NTFS partition?

  - by aalaap

  I have a 1TB drive with two 500GB partitions. One of them is being used as a Mac OS X Time Machine back up drive and the other one was NTFS and being used for storage. I had my entire 'iTunes Music' folder stored on it. Recently, there were some errors on the NTFS drive that caused chkdsk to run when in Windows, and it removed a lot of corrupt files. In this process, it converted my 'iTunes Music' folder into one zero KB file. How can I recover this? The partitions are intact and the other data on the disk is still accessible. It's just the 'iTunes Music' folder that's gone.

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• Puppet: array in parameterized classes VS using resources

  - by Luke404

  I have some use cases where I want to define multiple similar resources that should end up in a single file (via a template). As an example I'm trying to write a puppet module that will let me manage the mapping between MAC addresses and network interface names (writing udev's persistent-net-rules file from puppet), but there are also many other similar usage cases. I searched around and found that it could be done with the new parameterised classes syntax: if implemented that way it should end up being used like this: node { "myserver.example.com": class { "network::iftab": interfaces => { "eth0" => { "mac" => "ab:cd:ef:98:76:54" } "eth1" => { "mac" => "98:76:de:ad:be:ef" } } } } Not too bad, I agree, but it would rapidly explode when you manage more complex stuff (think network configurations like in this module or any other multiple-complex-resources-in-a-single-config-file stuff). In a similar question on SF someone suggested using Pienaar's puppet-concat module but I doubt it could get any better than parameterised classes. What would be really cool and clean in the configuration definition would be something like the included host type, it's usage is simple, pretty and clean and naturally maps to multiple resources that will end up being configured in a single place. Transposed to my example it would be like: node { "myserver.example.com": interface { "eth0": "mac" => "ab:cd:ef:98:76:54", "foo" => "bar", "asd" => "lol", "eth1": "mac" => "98:76:de:ad:be:ef", "foo" => "rab", "asd" => "olo", } } ...that looks much better to my eyes, even with 3x options to each resource. Should I really be passing arrays to parameterised classes, or there is a better way to do this kind of stuff? Is there some accepted consensus in the puppet [users|developers] community? By the way, I'm referring to the latest stable release of the 2.7 branch and I am not interested in compatibility with older versions.

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• Windows Home Server style redundancy/multi-disk-support on Windows Server 2008 R2?

  - by user19597

  I'm setting up a fileserver for our department. It'll be connected to the domain. I want it to have a very large amount of storage (several TB). Ideally, it should also preserve disk space by identifying identical files and only storing them once. It should be fault tollerant so that if one of the drives fails, that drive can be replaced without losing any data. All of these features are available in Microsoft's consumer offering - Windows Home Server. However, I can't find these kind of features within the enterprise Windows Server 2008 R2. Am I missing something? I know that I could buy a Drobo, or similar, and use this instead. However, I would prefer to use a built-in feature of Windows Server should it exist. It seems surprising to me that these features should be available in Home Server but not in an enterprise fileserver.

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• Fail rate of EBS snapshots and AMIs?

  - by user784637

  According to Amazon the fail rate of EBS volumes is: As an example, volumes that operate with 20 GB or less of modified data since their most recent Amazon EBS snapshot can expect an annual failure rate (AFR) of between 0.1% – 0.5%, where failure refers to a complete loss of the volume http://aws.amazon.com/ebs/ However, I was curious to know the fail rate of EBS snapshots and private AMIs that a system admin would take. Since the EBS snapshots and AMIs are stored in Amazon s3, is it safe to assume that the likelihood you cannot rollback to a previous snapshot or AMI the same likelihood that a file gets lost in s3? Amazon S3’s standard storage is: ... Designed to provide 99.999999999% durability and 99.99% availability of objects over a given year. http://aws.amazon.com/s3/

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