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34758 discussions

openldap missing modules
by wessel van der aart 31 Oct '11

31 Oct '11

Hi List, I'm currently setting up an openldap server and included the following lines in my slapd.conf : modulepath /usr/lib/ldap moduleload back_hdb after finishing up my config and i run slaptest on it i get an error saying that the modulepath doesn't exist. I checked and it indeed isn't there , in fact i can find it anywhere on my system (centos 5.7). the packages i've installed through yum are openldap openldap-servers and openldap-client. does anyone know where to find this folder? or do i have to install some package to get this module? Thanks, Wessel

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CentOS Download Mirrors
by Jonathan Vomacka 31 Oct '11

31 Oct '11

Guys, Is there a difference between CentOS 6.0 and centos 6 on the mirror list? Each mirror seems to have a folder for 6.0 and 6 separately. http://mirrors.lga7.us.voxel.net/centos/

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c6-cr kernel update -- joystick enabled?
by Frank Cox 31 Oct '11

31 Oct '11

Does the new kernel in the Centos 6 cr repository have the joystick enabled again, or is the rpm from elrepo still required to use one? -- MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com www.creekfm.com - FIFTY THOUSAND WATTS of POW WOW POWER!

1 0

read failed after messages of non existing harddisks
by Götz Reinicke 31 Oct '11

31 Oct '11

Hi, some time ago I removed some physical disks from a server and now I'm still getting dmesg messages like: sd 0:2:2:0: SCSI error: return code = 0x00040001 end_request: I/O error, dev sdc, sector 0 And all lvm tools still grumbel about that disks too: /dev/sdb: read failed after 0 of 4096 at 0: Eingabe-/Ausgabefehler /dev/sdb: read failed after 0 of 4096 at 1746969493504: Eingabe-/Ausgabefehler How may I tell the lvm and the system, that it is ok that this disk do not exist any more? Thnaks for hints and suggestion . Götz -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 420 Fax +49 7141 969 55 420 E-Mail goetz.reinicke(a)filmakademie.de Filmakademie Baden-Württemberg GmbH Akademiehof 10 71638 Ludwigsburg www.filmakademie.de Eintragung Amtsgericht Stuttgart HRB 205016 Vorsitzender des Aufsichtsrats: Jürgen Walter MdL Staatssekretär im Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg Geschäftsführer: Prof. Thomas Schadt

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Upgrading MySQL
by Jack Fredrikson 31 Oct '11

31 Oct '11

Hi; Upon trying to run django, I get this error: ImproperlyConfigured: MySQLdb-1.2.1p2 or newer is required; you have 1.2.1 If I run yum update mysql I don't upgrade (expected). What do? TIA, Jack

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CentOS 6 Bug Fix Announcements
by Ian Stirling 31 Oct '11

31 Oct '11

Are there going to be any CentOS 6 announcements made about bug fixes etc made to CentOS Announce mailing list ? CentOS 6 has been around for a while now, has many fixes available, yet I haven't seen a single announcement. Perhaps I am just not subscribed to the correct list . Ian

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C6: ssh X-forwarding does not work
by Rainer Traut 30 Oct '11

30 Oct '11

Hi all, I have C6 i386 with cr repo enabled; problem is, I can't get x-forwarding to work, xorg-x11-auth rpm is installed, have checked sshd config for #X11Forwarding no X11Forwarding yes #X11DisplayOffset 10 Here is a verbose ssh logon, I can't see any difference to a working server: debug1: Authentication succeeded (password). debug1: channel 0: new [client-session] debug3: ssh_session2_open: channel_new: 0 debug2: channel 0: send open debug1: Entering interactive session. debug2: callback start debug2: x11_get_proto: /usr/bin/xauth list unix:10.0 2>/dev/null debug1: Requesting X11 forwarding with authentication spoofing. debug2: channel 0: request x11-req confirm 0 debug2: client_session2_setup: id 0 debug2: channel 0: request pty-req confirm 0 and netstat does not show the open ports in the 60xx range: # netstat -antp|grep 60 tcp 0 0 192.168.200.31:22 192.168.200.30:58604 VERBUNDEN 2537/sshd: xxx [ Display var is not set...: [root@tr-centos ~]# env|grep -i DISPLAY [root@tr-centos ~]# Any obvious mistake? Thx Rainer

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You suggestion for 'big' filesystem management Best Practice?
by Götz Reinicke 28 Oct '11

28 Oct '11

Hi, we plan to set up a big file storage for media files like uncompressed movies from student film projects, dvd images etc. It should be some sort of archive and will not bee accessed by more than may be 5 people at the same time. The iSCSI RAID we have is about 26TB netto and I'm again faced with the question: How many partitions, which filesystem, which mount options etc. For the User it would be the most simpel thing, to have one big filesystem she/he could fill with all the data and dont has to search e.g. on multiple volumes. On the other hand, if one big filesystem crashes or has do be checked it will destroy a lot of data or the check will take hours ... Any suggestions pro or cons are welcome! :-) My favourite for now is 3 to 4 filesystems with the default ext4 settings. (Redhat EL 5.7, may be soon 6.1) Thanks and best regards. Götz -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 420 Fax +49 7141 969 55 420 E-Mail goetz.reinicke(a)filmakademie.de Filmakademie Baden-Württemberg GmbH Akademiehof 10 71638 Ludwigsburg www.filmakademie.de Eintragung Amtsgericht Stuttgart HRB 205016 Vorsitzender des Aufsichtsrats: Jürgen Walter MdL Staatssekretär im Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg Geschäftsführer: Prof. Thomas Schadt

5 9

ps locking up
by James Shupe 27 Oct '11

27 Oct '11

I have a client running a CentOS 6.0 machine with cPanel. The machine is fully updated with both cPanel (RELEASE) and the OS. At first, I noticed that after cPanel's dcpumon ran (even once), applications that depend on ps lock up and iowait jumps to around 50%. Load averages start out around 20 when this happens and slowly crawl up into the hundreds. Aside from not being able to run commands like ps and some nrpe scripts, everything still seems to respond fine even with the insanely high load. We've had it online with customers hitting it with a load of 400 waiting for a convenient time to reboot, without complaints. Clarification: If you run ps, it kills your terminal session. dcpumon, ps, etc, will hang around and you can see them under top (top doesn't seem to be affected.) If you try to kill any of these, (-9, anything) they do not respond. They're indefinitely blocked. They begin producing "processes being blocked for more than 120 seconds errors" in the logs. The server runs for days between this happening without issues and it always seems to be related to dcpumon. I wrote a script that checks to see if dcpumon exists in crontab and remove it. The script runs every minute. cPanel's automatic updates tend to put it back every once in a while, and it's possible that updates ran and that dcpumon ran before my script could remove it. I see that it removed it last night (it logs removals) but don't know for sure if it ran. It probably did. It's currently running 2.6.32-71.29.1.el6.x86_64 and I am considering trying vanilla kernel build to see if that corrects the issues. The hardware is HP DL145G3, and we have several other (non-cPanel) servers that are identical running CentOS 6.0 without issue. Any ideas? Thank you, -- James Shupe, OSRE developer/ engineer BSD/ Linux support & hosting jshupe(a)osre.org | www.osre.org O 9032530140 | F 9032530150 | M 9035223425

3 2

ssd quandry
by John R Pierce 27 Oct '11

27 Oct '11

On a CentOS 6 64bit system, I added a couple prototype SAS SSDs on a HP P411 raid controller (I believe this is a rebranded LSI megaraid with HP firmware) and am trying to format them for best random IO performance with something like postgresql. so, I used the raid command tool to build a raid0 with 2 SAS SSDs # hpacucli ctrl slot=1 logicaldrive 3 show detail Smart Array P410 in Slot 1 array C Logical Drive: 3 Size: 186.3 GB Fault Tolerance: RAID 0 Heads: 255 Sectors Per Track: 32 Cylinders: 47869 Strip Size: 256 KB Status: OK Array Accelerator: Enabled Unique Identifier: 600508B1001C2EDB6026F9ADF9F88A09 Disk Name: /dev/sdc Mount Points: /ssd 186.3 GB Logical Drive Label: AF36B716PACCRCN810E1R9J646A # hpacucli ctrl slot=1 show config Smart Array P410 in Slot 1 (sn: PACCRCN810E1R9J) .... array C (Solid State SAS, Unused Space: 0 MB) logicaldrive 3 (186.3 GB, RAID 0, OK) physicaldrive 1I:1:23 (port 1I:box 1:bay 23, Solid State SAS, 100 GB, OK) physicaldrive 1I:1:24 (port 1I:box 1:bay 24, Solid State SAS, 100 GB, OK) # hpacucli ctrl slot=1 show ssdinfo detail Smart Array P410 in Slot 1 Total Solid State Drives with Wearout Status: 0 Total Smart Array Solid State Drives: 2 Total Solid State SAS Drives: 2 Total Solid State Drives: 2 array C physicaldrive 1I:1:23 Port: 1I Box: 1 Bay: 23 Status: OK Drive Type: Data Drive Interface Type: Solid State SAS Size: 100 GB Firmware Revision: 1234 Serial Number: 999999999999999999 Model: XYZZY M2011 Current Temperature (C): 30 Maximum Temperature (C): 37 SSD Smart Trip Wearout: Not Supported PHY Count: 2 PHY Transfer Rate: 6.0GBPS, Unknown physicaldrive 1I:1:24 Port: 1I Box: 1 Bay: 24 Status: OK Drive Type: Data Drive Interface Type: Solid State SAS Size: 100 GB Firmware Revision: 1234 Serial Number: 999999999999999999 Model: XYZZY M2011 Current Temperature (C): 29 Maximum Temperature (C): 36 SSD Smart Trip Wearout: Not Supported PHY Count: 2 PHY Transfer Rate: 6.0GBPS, Unknown # tail /var/log/messages Oct 22 22:56:24 svfis-dl180b kernel: sd 0:0:0:3: Attached scsi generic sg3 type 0 Oct 22 22:56:24 svfis-dl180b kernel: sd 0:0:0:3: [sdc] 390611040 512-byte logical blocks: (199 GB/186 GiB) Oct 22 22:56:24 svfis-dl180b kernel: sd 0:0:0:3: [sdc] 8192-byte physical blocks Oct 22 22:56:24 svfis-dl180b kernel: sd 0:0:0:3: [sdc] Write Protect is off Oct 22 22:56:24 svfis-dl180b kernel: sd 0:0:0:3: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA Oct 22 22:56:24 svfis-dl180b kernel: sdc: unknown partition table Oct 22 22:56:24 svfis-dl180b kernel: sd 0:0:0:3: [sdc] Attached SCSI disk Oct 22 22:56:36 svfis-dl180b cmaeventd[2540]: Logical drive 3 of Array Controller in slot 1, has changed from status Unconfigured to OK # mkfs.ext4 /dev/sdc mke2fs 1.41.12 (17-May-2010) /dev/sdc is entire device, not just one partition! Proceed anyway? (y,n) y Filesystem label= OS type: Linux Block size=8192 (log=3) Fragment size=8192 (log=3) Stride=1 blocks, Stripe width=0 blocks 12210528 inodes, 24413190 blocks 1220659 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=4311218176 373 block groups 65528 blocks per group, 65528 fragments per group 32736 inodes per group Superblock backups stored on blocks: 65528, 196584, 327640, 458696, 589752, 1638200, 1769256, 3210872, 5307768, 8191000, 15923304, 22476104 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done # mount -t ext4 /dev/sdc /ssd mount: wrong fs type, bad option, bad superblock on /dev/sdc, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so # tail /var/log/messages ... Oct 22 23:54:36 svfis-dl180b kernel: EXT4-fs (sdc): bad block size 8192 ok, so lets try 4K blocks? # mkfs.ext4 -b 4096 /dev/sdc mke2fs 1.41.12 (17-May-2010) /dev/sdc is entire device, not just one partition! Proceed anyway? (y,n) y mkfs.ext4: Invalid argument while setting blocksize; too small for device hmmm. can't do that either? can I configure this 64bit system for large pages or something so it will support 8K blocks? -- john r pierce N 37, W 122 santa cruz ca mid-left coast

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