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• mpirun -np N, what if N is larger than my core number?

  - by Daniel

  Say I have a 4-core workstation, what would linux (Ubuntu) do if I execute mpirun -np 9 XXX Q1. Will 9 run immediately together, or they will run 4 after 4? Q2. I suppose that using 9 is not good, because the remainder 1, it will make the computer confused, (I don't know is it going to be confused at all, or the "head" of the computer will decide which core among the 4 cores will be used?) Or it will be randomly picked. Who decide which one core to call? Q3. If I feel my cpu is not bad and my ram is okay and large enough, and my case is not very big. Is it a good idea in order to fully use my cpu and ram, that I do mpirun -np 8 XXX, or even mpirun -np 12 XXX. Q4. Who decides all of these effciency optimization, Ubuntu, or linux, or motherboard or cpu? Your enlightenment would be really appreciated.

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• MySQL-Cluster or Multi-Master for production? Performance issues?

  - by Phillip Oldham

  We are expanding our network of webservers on EC2 to a number of different regions and currently use master/slave replication. We've found that over the past couple of months our slave has stopped replicating a number of times which required us to clear the db and initialise the replication again. As we're now looking to have servers in 3 different regions we're a little concerned about these MySQL replication errors. We believe they're due to auto_increment values, so we're considering a number of approaches to quell these errors and stabilise replication: Multi-Master replication; 3 masters (one in each region), with the relevant auto_increment offsets, regularly backing up to S3. Or, MySQL-Cluster; 3 nodes (one in each region) with a separate management node which will also aggregate logs and statistics. After investigating it seems they both have down-sides (replication errors for the former, performance issues for the latter). We believe the cluster approach would allow us to manage and add new nodes more easily than the Multi-Master route, and would reduce/eliminate the replication issues we're currently seeing. But performance is a priority. Are the performance issues of MySQL-Cluster as bad as people say?

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• Windows Server 2008 R2 DNS - One IP, multiple servers

  - by Blu Dragon

  I need opinions and examples on how to best to accomplish the setup I am looking for. I have a public-facing AD domain server with one public IP address. I have setup an external zone for example.com and I successfully have my own name servers pointing to it at ns0.example.com and ns1.example.com. I also have an internal zone for my private network at home.example.com. I am behind a router with the domain server in the DMZ. I want dev.example.com to be accessible from the outside world over https and to point to internal IP address 192.168.1.78. Likewise, I want www.example.com to be accessible from the outside world and point to internal IP address 192.168.1.79. Both dev and www servers are CentOS 5.6 VMs running inside of Hyper-V on the domain server (bad idea I know but I am limited on hardware atm). What is best way to achieve this? From what I have read and researched on Google, I may need to setup a reverse proxy but I am not sure how well that will work with SSL.

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• You need to format the disk in drive

  - by Sab

  I was copying some files over to my external hard disk and suddenly a message popped up saying that some file was open and it could not continue.It asks me whether I want to cancel the operation and I said cancel(The other operation was continue.) After that whenever I plug in the usb into the same computer it does not work. It keeps saying that I need to format the disk to continue. Luckily for me it opened on another computer and am backing up all my data. But now I am wondering why exactly this happened. Is it that the hard disk is weak. Also as an addon I currently use http://www.dtidata.com/windowssurfacescanner/ program to check for bad sectors. Is this the recommended way or is there some other better more reliable way to check if my hard disk is failing? Also could the above problem be because the hard disk is failing? If not why does it happen.Even if the hard disk is interrupted in the middle of a read write cycle doesnt there exist error handling code to enable gracefull recovery?

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• How to fix Browser Blue Screen of Death?

  - by WilliamKF

  I am running Windows XP SP3 and Firefox v3.6.2 and Internet Explorer and have an issue with Firefox and IE causing the Blue Screen of Death. If I run in Windows safe mode, it does not occur, but running normally, it seems my firefox profile is going bad and results in certain web pages causing the BSOD. IE is also getting BSOD on some pages. For example, presently, if I visit ebay.com in Firefox, it gets BSOD. It also fails when visiting http://www.google.com/ig?hl=en&source=iglk. IT removed my Firefox profile and that seemed to fix the issue for a while. However, now it has started occurring again. I turned off all firefox extensions and it still occurs. I'd like to fix my system so this does not occur. The IT folks don't seem to be able to solve this, so I am trying to fix it on my own. The BSOD is about something like (from memory) DRIVER_IRQL_NOT_LESS_OR_EQUAL. Why would safe mode avoid the issue and what does that tell us about the probable cause? I don't want to have to keep deleting my profile, so I'd like to find out the cause of the corruption.

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• Kerberos & localhost

  - by Alex Leach

  I've got a Kerberos v5 server set up on a Linux machine, and it's working very well when connecting to other hosts (using samba, ldap or ssh), for which there are principals in my kerberos database. Can I use kerberos to authenticate against localhost though? And if I can, are there reasons why I shouldn't? I haven't made a kerberos principal for localhost. I don't think I should; instead I think the principal should resolve to the machine's full hostname. Is that possible? I'd ideally like a way to configure this on just one server (whether kerberos, DNS, or ssh), but if each machine needs some custom configuration, that'd work too. e.g $ ssh -v localhost ... debug1: Unspecified GSS failure. Minor code may provide more information Server host/[email protected] not found in Kerberos database ... EDIT: So I had a bad /etc/hosts file. If I remember correctly, the original version I got with Ubuntu had two 127.0. IP addresses, something like:- 127.0.0.1 localhost 127.0.*1*.1 hostname For no good reason, I'd changed mine a long time ago to: 127.0.0.1 localhost 127.0.*0*.1 hostname.example.com hostname This seemed to work fine with everything until I tried out ssh with kerberos (a recent endeavour). Somehow this configuration led to sshd resolving the machine's kerberos principal to "host/localhost@\n", which I suppose makes sense if it uses /etc/hosts for forward and reverse dns lookups in preference to external dns. So I commented out the latter line, and sshd magically started authenticating with gssapi-with-mic. Awesome. (Then I investigated localhost and asked the question)

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• Is it ever good to share a userid?

  - by Ladlestein

  On Un*x, Is it ever a good idea to have one userid that many different people log into when they do stuff? Often I'm installing software or something on a Linux or BSD system. I've developed software for 24 years now, so I know how to make the machine do what I want, but I've never had responsibility for maintaining a multi-user installation where anyone really cared about security. So my opinions feel untested. Now I'm at a company where there's a server that many people log into with a single userid and do stuff. I'm installing some software on it. It's not really a public-facing server, and is only accessible via VPN, but it's used by many people nonetheless, to run tests on custom software, things like that. It's a staging server. I'm thinking that at the very least, using a single user obscures an audit trail, and that's bad. And it's just inelegant, because people don't have their own spaces on the server. But then again, with more userids, maybe there's a greater chance that one can be compromised, allowing attackers to gain access. ?

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• Is "DSLAM congestion" a legitimate reason for slow DSL?

  - by Jay Bazuzi

  My DSL has been extremely slow in the evenings recently. To test it, I telnet to my DSL Modem, and ping the gateway. This way I eliminate internet congestion and local network issues. In the mornings I get 30ms - 50ms pings. In the evenings, it bounces around a lot, but 10000ms pings are common. I complained to Qwest support, and they said it was a known issue on their end, their engineers were working on it, and wouldn't say anything else. A couple days later I complained again, and they sent out a technician. He tested my house wiring and found that one of them had a short. It was an unused line, so we disconnected it, and he said things looked better and left. My daytime speeds improved at this point, but evening is still bad. I complained to Qwest support again, and they said it was a problem with DSLAM congestion at their end, and that they were working on it, but no ETA. My neighbor has Qwest DSL and doesn't seem to have these problems. That seems strange. I go use her network when I absolutely must get online and mine is behaving badly. I can't tell if they're yanking my chain or not. Regardless, these speeds are crap. I'm paying for 7Mpbs but am lucky if I get 1/10th that in the evenings. My kids like to watch Netflix streaming movies, and it's just impossible after 5pm or so. Should I wait it out? Will complaining again produce any results? Should I change my subscription to a lower speed until they fix their end? Or switch to cable?

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• Hostname and SSL (apache) issue on Debian

  - by user105566

  I have been trying to setup SSL virtual host ServerAdmin [email protected] ServerName moclm.tap.pt DocumentRoot /var/www/tapme/ <Directory /> Options FollowSymLinks AllowOverride All Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> <Directory /var/www/tapme/> Options -Indexes FollowSymLinks MultiViews AllowOverride All #Order allow,deny #allow from all </Directory> SSLEngine on SSLCertificateFile /etc/ssl/moclm.cer SSLCertificateKeyFile /etc/ssl/moclm.pem </VirtualHost> For some reason, the server automatically redirect to SSL (http:// to https://). The apache is not configured to redirect and application was working fine on port 80 only. I have no knowledge how the internal network works as i am working remotely. The SSL error logs show: [Tue Oct 02 22:40:32 2012] [error] Hostname linemnt01.tap.pt provided via SNI and hostname moclm.tap.pt provided via HTTP are different I thought may be the hostname has some issue and have changed the hostname of the server from "linemnt01.tap.pt" to "moclm.tap.pt" but the issue is still there. I am getting the following error on browser: Bad Request Your browser sent a request that this server could not understand. i have /etc/hosts: 127.0.0.1 localhost.localdomain localhost moclm.tap.pt moclm and openssl returns: openssl verify -CAfile cert-CA.cer moclm.cer moclm.tap.pt.cer: OK I have been trying to troubleshoot the issue but no luck. Need help Thanks

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• USB mouse disconnecting and reconnecting in windows and linux

  - by Kalak

  I have a problem similar to what is described at "Why is my USB mouse disconnecting and reconnecting randomly and often?" except is is happening in both Windows 7 and Linux (Ubuntu 12/04TLS, fully patched), multiple mice, multiple OSs. It stops responding to input for about 3-5 seconds, then starts responding again. It's more frequent and lasts longer when running games (TF2, L4D, Dishonored, Borderlands 2, and more), but happens when just running the OS as well. I was hoping it was the motherboard so I bought a USB 2.0 PCI card to try that, but it's still happening. I've stripped it down to just the keyboard and mouse (different keyboard too just in case the keyboard was the problem), but it's still happening. All the hardware (mice and keyboards) work fine on other computers. I have literally pulled the mouse and keyboard out and plugged them into another computer (laptop) and re-joined the online game and had no problem with the keyboard and mouse combo that just failed on my gaming rig. Please no driver / Windows or Linux only suggestions, as that wouldn't effect both OSs. edit: known good mice I've brought home are now going bad. I suspect the hardware is messed up (voltage?) and has been frying the mice.

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• Weird connectivity issue wtih USB Wifi stick.

  - by Carlos Nunez

  Hi, all! I'm not sure if this is the appropriate place to throw this question out there, but I'll give it a shot. I'm setting up two PCs, and I've been having massive troubles getting a USB wireless dongle working. I have two Sony VAIOs (Windows XP, SP2) that I found second-hand, and since they will be in a location too far to connect by Ethernet (no, can't do patch panels here :p), I need to connect them by wireless. Easiest and cheapest way to do that at the moment is by using two USB wireless sticks that I've had for a while, but never used. One of the computers is using a SMC-manufactured card, whereas the other is using a Belkin F5D7050. The box with the SMC card can see and authenticate with my router just fine, and has no problem obtaining a DHCP lease. The box with the Belkin, on the other hand, isn't so lucky. While it can see my router and associate with it, it will not obtain a DHCP-issued address. Worse, when I assign a static IP address to the NIC, it can ping the entire network and access the internet (meaning it can authenticate with the router), but no computer can ping to it UNLESS that computer pinged the computer that's pinging it first. Confused? Well, so am I. Has anyone had this issue before? Is this just a sign of a bad card? (For the moment, I have it connected by Ethernet, as I haven't moved it yet. However, this will be a problem when I set it up in its new home later.) Thanks! -Carlos Nunez

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• Why does ATI 5570 HD video card driver installation cause Windows 7 To Blue Screen?

  - by Mort

  This one is for the hive mind. I have a brand new Dell Optiplex 760 workstation with 4 gigabytes of RAM running Windows 7 Professional (32bit). This is a new box with nothing installed other than what was provided for directly by Dell. I installed a Saphire ATI PCI Express 5570 HD. Upon trying to install the 10.4 Catalyst drivers the system will blue screen. It blue screens during the hardware detection phase of the installation process. I have already performed the following trouble shooting steps: Changed system RAM Installed only 2 gigabytes of RAM Installed different versions of Catalyst drivers (10.4 - 9.12) Tried to install video only component of driver (vs entire Catalyst suite) Made sure Windows 7 was fully updated Flashed mother board BIOS to current version Removed and re-seated video card Contacted ATI Support (We all know how this went......) Verified supply outputting properly The blue screen error (via Windows BugCheck entry in event log) is a 0x000000CA and refers to a plug and play error most likely caused by a bad driver. The problem is that the driver installation process never gets far enough to actually install a driver. The resolution center in Windows provides a solution of installing the 10.4 Catalyst driver to resolve issue (which fails). Looking for some alternate views to resolve.

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• apache-user & root access

  - by ahmedshaikhm

  I want to develop few scripts in php that will invoke following commands; using exec() function service network restart crontab -u root /xyz/abc/fjs/crontab etc. The issue is that Apache executes script as apache user (I am on CentOS 5), regardless of adding apache into wheel or doing good, the bad and the ugly group assignment does not run commands (as mentioned above). Following are my configurations; My /etc/sudoers root ALL=(ALL) ALL apache ALL=(ALL) NOPASSWD: ALL %wheel ALL=(ALL) ALL %wheel ALL=(ALL) NOPASSWD: ALL As I've tried couple of combination with sudoer & httpd.conf, the recent httpd.conf look something as follows; my httpd.conf User apache Group wheel my PHP script exec("service network start", $a); print_r($a); exec("sudo -u root service network start", $a); print_r($a); Output Array ( [0] => Bringing up loopback interface: [FAILED] [1] => Bringing up interface eth0: [FAILED] [2] => Bringing up interface eth0_1: [FAILED] [3] => Bringing up interface eth1: [FAILED] ) Array ( [0] => Bringing up loopback interface: [FAILED] [1] => Bringing up interface eth0: [FAILED] [2] => Bringing up interface eth0_1: [FAILED] [3] => Bringing up interface eth1: [FAILED] ) Without any surprise, when I invoke restart network services via ssh, using similar user like apache, the command successfully executes. Its all about accessing such commands via HTTP Protocol. I am sure cPanel/Plesk kind of software do use something like sudoer or something and what I am trying to do is basically possible. But I need your help to understand which piece I am missing? Thanks a lot!

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• Windows 7 doesn't boot when second hard disk is connected

  - by kenshin9786

  I'm sorry for my bad english on beforehand. I have two hard disks, one SATA and another IDE. I have windows XP and 7 on the SATA one, and Ubuntu on the IDE. Both of them boots and works, bios recognizes them, just works. After I installed Windows 7, and connected the IDE drive, it freezes on "Starting Windows" (the black screen with the Windows logo). I unplug the IDE drive, and it starts normally. Windows XP starts normally on both situations (with or without the IDE one connected), same for Ubuntu (it works with both disks connected or just the IDE where it is). The IDE drive is on good status according to SMART. The IDE is first on boot order. It goes to the Ubuntu's grub first, then by default it goes to the Windows 7 bootloader, and then to XP. I think the problem is not about the bootloader or grub. I just read that it can be solved formatting the "problematic" hard disk because Windows 7 cannot handle so many active partitions or something like that. But that's not an option for me, I don't want to lose my Ubuntu nor have it unbootable. How can I solve this without this consecuences I mentioned? Any help would be appreciated.

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• 32bit SQLServer with AWE NOT enabled. Buffer Cache Hit Ratio High, Disk Read Queue VERY HIGH, WHY?

  - by chenwq

  We have a "SQLServer 2005 SP3 32bit Enterprise Edition" running on a 32 bit Windows 2003 32bit Enterprise Edition 12GB RAM with AWE enabled using RAID5(5 pysical disks). We tuned AWE to enabled and restart sqlserver this afternoon after work, hope the performance will be better than old time. But there is something that we are very confused. On working days, SQLServer has a very bad performance. When we are looking for reasons, we check Windows Performance counter. Avg. Disk Read Queue Lenght > 140 Avg. Disk Write Queue Length < 1 SQL Server Buffer Cache Hit Ratio > 96% %Processor Time < 30% SQL Server Total Server Memory < 1.8G Obviously, without AWE enabled, SQL Server can use only less than 2G memory. My Question is: why "SQL Server Total server Memory" is less than 2G?I think SQL Server will use all 2G process address space. Does this counter count anything out? we known that sql server is sufferring lack of memory, but why "buffer hit ratio“ is as high as 96? Any advice is welcomed!

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• Managing a test iSCSI target server

  - by dyasny

  Hi all, I am using a RHEL server with a few hard drives, and tgtd as the iscsi target software. I a looking for a way to allocate and deallocate space and targets with that space, without restarting my system, or harming other LUNs. Currently, all my HDDs are PVs in a single VG, and I lvcreate/lvremove as required, and then export the allocated LVs using a tgt script: usr/sbin/tgtadm --lld iscsi --op new --mode target --tid=1 --targetname iqn.2001-04.com.lab.gss:300gb /usr/sbin/tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/mapper/iscsi_vg-iscsi_300Gb /usr/sbin/tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL /usr/sbin/tgtadm --lld iscsi --op new --mode target --tid=2 --targetname iqn.2001-04.com.lab.gss:200gb /usr/sbin/tgtadm --lld iscsi --op new --mode logicalunit --tid 2 --lun 1 -b /dev/mapper/iscsi_vg-iscsi_200Gb /usr/sbin/tgtadm --lld iscsi --op bind --mode target --tid 2 -I ALL /usr/sbin/tgtadm --lld iscsi --op new --mode target --tid=3 --targetname iqn.2001-04.com.lab.gss:100gb /usr/sbin/tgtadm --lld iscsi --op new --mode logicalunit --tid 3 --lun 1 -b /dev/mapper/iscsi_vg-iscsi_100Gb /usr/sbin/tgtadm --lld iscsi --op bind --mode target --tid 3 -I ALL tgtadm --mode target --op show So in order to remove a LUN, I stop the tgtd service, lvremove the lv, and remove the entry from the iscsi target script When I add a lun, I run lvcreate, and then add an entry to the script and run it. This is not quite optimal, since restarting the service is a bad idea while other LUNs are busy, so I am looking for a more scalable and safer way. Thanks

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• VoIP setup for one external PSTN line

  - by Jcl

  I'm completely new to VoIP and the likes, and I'm trying to find information about what could be the best setup for this. I need 4 (maybe more in the future, but maximum 5 or 6) wireless extensions, connected to 1 PSTN line, and maybe 2 in the future. I've been trying to gather information about the gear needed but everything I find seems too much over-the-top (and extremely expensive). The main problem is that the physical place we are on doesn't have possibilities of having a decent internet connection, so using a external VoIP "virtual PBX" is not an option. Thing is, even if small, phone is critical to this organization. I currently have an analog DECT/GAP PBX which does what I need, however the PBX is very bad and the call quality is horrible, and that's why I want to change it. The requirements would be: 4 wireless terminals (routing cable is not an option), all of them ringing on incoming PSTN calls. Ability to do internal calls (4 separate offices) and ability to pass calls between terminals. The 4 terminals should be able to access the external PSTN line without dialing any special codes. Very important: terminals should be able to issue commands on the PSTN line to the external operator in the form *nn*nnnnnnnn# . Don't know wether this could face to be a problem, but I've had problems with analog PBX which would take any * as a PBX command and wouldn't allow terminals to send it to the external lines. Not so important, but would be nice to have: call waiting music Could anyone recommend such a setup? I need to be able to do this on a EXTREMELY LIMITED budget (that is: I don't have a limit, but all should get as much to zero as possible). I have enough spare powerful computers and a 300mbps wireless network which works just fine, so that's not to include in the budget. Don't really know if this is the best place to ask, but it's the most StackExchange-related site I've found to this subject.

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• Opera 10.5 RAM usage and Google Reader?

  - by David

  Hi all, Today I upgraded to Opera 10.5 from Google Chrome and I have two really important questions about it. 1) Is it normal for it to use SO MUCH RAM!!!!? Closing tabs doesn't help, but opening new ones add on to the usage. I can have just 4 tabs open and it goes up to the 300MB mark and I only have 1.5GB in my laptop, 596MB of it used by the graphics card so this really unacceptable. Is there a way to fix it? 2) Why does Google Reader feel so slow and unresponsive on it? It lags so bad when I just try scrolling through the page. I know Opera is known for being really smooth while scrolling through pages. There's also a white bar at the bottom of the page that I can get rid of. It blocks the "Next" and "Previous" buttons. The test between articles is also sort of intersecting each other and that just looks completely unattractive and that's something i'm not used with any web browser. I realize there's a built-in RSS reader, but it doesn't sync across multiple computers and is very late at updating. Here are my specs: Windows 7 Ultimate (x86), Intel Pentium M 1.86 GHz, 1.5GB RAM, ATI Mobility Radeon X600 (64MB dedicated, 596MB shared)

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• Apache wont start after attempting to install SSL

  - by yummm

  Below is what my VirtualHosts look like in httpd.conf <VirtualHost *:80> # Admin email, Server Name (domain name) and any aliases ServerAdmin [email protected] ServerName mydomain.com ServerAlias www.mydomain.com # Index file and Document Root (where the public files are located) DirectoryIndex index.php DocumentRoot /home/mydomain/public_html/mydomain.com/public # Custom log file locations LogLevel warn ErrorLog /home/mydomain/public_html/mydomain.com/log/error.log CustomLog /home/mydomain/public_html/mydomain.com/log/access.log combined </VirtualHost> <VirtualHost *:443> SSLEngine on SSLCertificateFile /etc/httpd/conf/ssl.crt/mydomain.com.crt SSLCertificateKeyFile /etc/httpd/conf/ssl.key/mydomain.com.key ServerName mydomain.com DirectoryIndex index.php DocumentRoot /home/mydomain/public_html/mydomain.com/public </VirtualHost> I'm using the latest version of Apache on CentOS and there isn't any error being generated. Apache just will not start. Any ideas what I'm doing wrong? UPDATE - Found these messages in the error log: [Tue Mar 16 02:07:57 2010] [error] Init: Private key not found [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218710120 error:0D094068:asn1 encoding routines:d2i_ASN1_SET:bad tag [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218529960 error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218595386 error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218734605 error:0D09A00D:asn1 encoding routines:d2i_PrivateKey:ASN1 lib

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• How to eliminate the downtime when a dynamic IP address changes?

  - by xenon

  We currently have a number of client computers linked up to a database server (MS SQL 2008) for replication. The database server recognises the computers based on their Windows hostname. We are using dynamic IP addresses at this time because we tend to change the computers’ hardware quite frequently, and so the MAC address may be different. Unless static IP has a good way for us to manage frequent changing of MAC addresses, we are keeping it to dynamic IP. The problem with dynamic IP addresses, however, is that when a client fetches an new IP from the DHCP, ie, there is a change in the IP address, there is going to have a downtime for the hostname to reflect the new IP address, the client’s DNS cache of the hostname to reload, and also the server’s DNS cache to reload to see the new IP from the hostname. All of these have different timings and the delay can be really bad at times. Restarting the computer doesn't work all the time too. The clients are on Windows 7. How can I eliminate the amount of downtime required when there is a change in IP in the case of dynamic IP addresses?

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• Apache httpd LDAP integration

  - by David W.

  I am configuring a CollabNet Subversion integration. I have the following collabnet_subversion.conf file: <Location /svn> DAV svn SVNParentPath /mnt/svn/new_repos SVNListParentPath on AuthName "VegiBanc Source Repository" AuthType basic AuthzLDAPAuthoritative off AuthBasicProvider ldap AuthLDAPURL ldap://ldap.vegibanc.com/dc=vegibanc,dc=com?sAMAccountName" NONE AuthLDAPBindDN "CN=SVN-Admin,OU=Service Accounts,OU=VegiBanc Users,OU=vegibanc,DC=vegibanc,DC=com" AuthLDAPBindPassword "swordfish" </Location> This works great. Any user in our Active Directory can access our Subversion repository. Now, I want to limit this to only people in the Active Directory group Development: <Location /svn> DAV svn SVNParentPath /mnt/svn/new_repos SVNListParentPath on AuthName "VegiBanc Source Repository" AuthType basic AuthzLDAPAuthoritative off AuthBasicProvider ldap AuthLDAPURL ldap://ldap.vegibanc.com/dc=vegibanc,dc=com?sAMAccountName" NONE AuthLDAPBindDN "CN=SVN-Admin,OU=Service Accounts,OU=VegiBanc Users,OU=VegiBanc,DC=vegibanc,DC=com" AuthLDAPBindPassword "swordfish" Require ldap-group CN=Development OU=Security Groups OU=VegiBanc, dc=vegibanc, dc=com </Location> I added Require ldap-group, but now no one can log in. I have LogLevel set to debug, but all I get is this in my error_log (Single line broken up for easier reading): [Thu Oct 11 13:09:28 2012] [info] [client 10.55.9.45] [6752] vauth_ldap authenticate: user dweintraub authentication failed; URI /svn/ [ldap_search_ext_s() for user failed][Bad search filter] And, I get this in my access_log: 10.55.9.45 - - [11/Oct/2012:13:09:27 -0500] "GET /svn/ HTTP/1.1" 401 401 10.55.9.45 - dweintraub [11/Oct/2012:13:09:28 -0500] "GET /svn/ HTTP/1.1" 500 535 Yes, I am in that group. (Or, at least how can I confirm that just to make sure that's not the issue. I have the SysinternalsSuite ADExplorer. It's where I'm getting all of my info.)

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• Disk IO slow on ESXi, even slower on a VM (freeNAS + iSCSI)

  - by varesa

  I have a server with ESXi 5 and iSCSI attached network storage(4x1Tb Raid-Z on freenas 8.0.4). Those two machines are connected to each other with Gigabit ethernet. The raid-z volume is divided into three parts: two zvols, shared with iscsi, and one directly on top of zfs, shared with nfs and similar. I ssh'd into the freeNAS box, and did some testing on the disks. I used ddto test the third part of the disks (straight on top of ZFS). I copied a 4GB (2x the amount of RAM) block from /dev/zero to the disk, and the speed was 80MB/s. Other of the iSCSI shared zvols is a datastore for the ESXi. I did similar test with time dd .. there. Since the dd there did not give the speed, I divided the amount of data transfered by the time show by time. The result was around 30-40 MB/s. Thats about half of the speed from the freeNAS host! Then I tested the IO on a VM running on the same ESXi host. The VM was a light CentOS 6.0 machine, which was not really doing anything else at that time. There were no other VMs running on the server at the time, and the other two "parts" of the disk array were not used. A similar dd test gave me result of about 15-20 MB/s. That is again about half of the result on a lower level! Of course the is some overhead in raid-z - zfs - zvolume - iSCSI - VMFS - VM, but I don't expect it to be that big. I belive there must be something wrong in my system. I have heard about bad performance of freeNAS's iSCSI, is that it? I have not managed to get any other "big" SAN OS to run on the box (NexentaSTOR, openfiler). Can you see any obvious problems with my setup?

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• SQL Server Installation: Is it 32 or 64 bit?

  - by CapBBeard

  Recently I was performing an OS upgrade on one of our DB servers, moving from Server 2003 to Server 2008. The DBMS is SQL Server 2005. While reinstalling SQL on the new Windows installation, I went to another of our DB servers to verify a couple of settings. Now, I always thought this second server was Server 2003 x64 + SQL 2005 x64 (from what I'd been told), but I now have my doubts about this. I now suspect that it is in fact only 32 bit SQL, however I'd like to verify this. Here's some details: The OS is definitely 64 bit. xp_msver shows Platform as NT INTEL X86 SELECT @@VERSION shows Microsoft SQL Server 2005 - 9.00.4035.00 (Intel X86)... However sqlservr.exe is not shown with '* 32' in taskmgr, does anyone know why this is the case, if it is in fact 32 bit as claimed? Despite this, it does seem to be running out of the x86 program files folder. If I do the same checks on a confirmed 64 bit installation, it does give back the expected 64 bit readings, which can only prove that this server in question is only running in 32 bit. Now, that being the case, the question arises about how much memory this '32 bit' install can use. Task manager reports about 3.5GB memory usage for sqlservr.exe (The server has 16GB physical). I suspect that AWE has not been configured at all, and therefore the server will be significantly under-utilised (remembering that the OS is 64 bit) if SQL is simply using a 32bit address space. Is this assumption correct? I feel the server should have SQL reinstalled as 64 bit in order to fully utilise the hardware platform, however it is currently heavily in production; this will be no easy task. I suspect we may just have to configure AWE correctly and let it be for the time being (Unless this is a bad idea?). I apologise that this question is a little vague/lost; I'm no SQL expert, just trying to get a handle on what's going on here.

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• error in auth.log but can login; LDAP/PAM

  - by Peter

  I have a server running OpenLDAP. When I start a ssh-session I can log in without problems, but an error appears in the logs. This only happens when I log in with a LDAP account (so not with a system account such as root). Any help to eliminate these errors would be much appreciated. The relevant piece from /var/log/auth.log sshd[6235]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=example.com user=peter sshd[6235]: Accepted password for peter from 192.168.1.2 port 2441 ssh2 sshd[6235]: pam_unix(sshd:session): session opened for user peter by (uid=0) pam common-session session [default=1] pam_permit.so session required pam_unix.so session optional pam_ldap.so session required pam_mkhomedir.so skel=/etc/skel umask=0022 session required pam_limits.so session required pam_unix.so session optional pam_ldap.so pam common-auth auth [success=1 default=ignore] pam_ldap.so auth required pam_unix.so nullok_secure use_first_pass auth required pam_permit.so session required pam_mkhomedir.so skel=/etc/skel umask=0022 silent auth sufficient pam_unix.so nullok_secure use_first_pass auth requisite pam_succeed_if.so uid >= 1000 quiet auth sufficient pam_ldap.so use_first_pass auth required pam_deny.so pam common-account account [success=2 new_authtok_reqd=done default=ignore] pam_ldap.so account [success=1 default=ignore] pam_unix.so account required pam_unix.so account sufficient pam_succeed_if.so uid < 1000 quiet account [default=bad success=ok user_unknown=ignore] pam_ldap.so account required pam_permit.so account sufficient pam_ldap.so account sufficient pam_unix.so

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• I/O APIC on Virtualbox

  - by RidDeBakTiYar

  I'm trying to use the PIT to do APIC timer calibration, and I want to use the PIT through I/O APIC instead of PIC. On Bochs I get interrupts from the PIT at the asked frequency from the I/O APIC, while on Virtualbox I can't receive a single interrupt. It must be an I/O APIC configuration problem because as I unmask the first PIC entry, the IRQ fires. However that's not what I want. Can you imagine any possible condition that wouldn't make Virtualbox fire the IRQ? I'm not assuming single I/O APIC configuration (even though Virtualbox has only 1). I'm not assuming identity mappings between ISA IRQs and I/O APIC GSIs (using ACPI MADT table to get I/O APIC base address and Int override). I'm setting the Trigger Mode and Polarity bits correctly (on Virtualbox they are set as '00 - default' which means edge high right?). I'm putting the BSP APIC ID into the Destination field (using Physical destination) and vector 0x20. Being the BSP APIC ID 0 on Virtualbox, it ends up with 0x0000000000000020 written to the IOREDTBL. And, just in case I'm getting the wrong values from the Interrupt Override descriptor, I'm setting this value to all the IOREDTBL entries (I know this is very very bad, and it wont be kept as I understand what's going on). The only thing I didn't check out is Local APIC configuration. Actually I'm not writing any value to the BSP LAPIC. Just reading the APIC ID and using it to boot APs through IPIs. And obviously I'm setting bit 11 in the IA32_APIC_BASE MSR to enable the LAPIC. Any ideas? Thanks in advance.

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