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System Hang on busy NFS server
by James A. Peltier 26 Aug '13

26 Aug '13

On a busy NFS server I've started receiving the following error messages and the system hangs with high load but no work being done. The system is a Dell R510 with 12 x 3TB drives in a RAID-50 configuration. The RAID-50 device is a full disk LVM (no partitions) and one large (36TB) data volume and the system is running CentOS 6.4 fully patched for OS and firmware. Anyone have any hints as to what might be causing this. It looks to me like the system is starting to swap and then failing and then XFS starts to throw a hissy fit because it can't start allocating pages for it's buffers. Eventually then the system just deadlocks. I'm just looking for someone to confirm my findings and let me know if this is a bug or not. I've posted the dmesg output onto pastebin http://pastebin.com/YQbhsN6a Any help is very much appreciated! -- James A. Peltier Manager, IT Services - Research Computing Group Simon Fraser University - Burnaby Campus Phone : 778-782-6573 Fax : 778-782-3045 E-Mail : jpeltier(a)sfu.ca Website : http://www.sfu.ca/itservices “A successful person is one who can lay a solid foundation from the bricks others have thrown at them.” -David Brinkley via Luke Shaw

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Missing terminal bell
by adrian＠pa0rda.nl 26 Aug '13

26 Aug '13

Hi, After I started using my new desktop I miss my terminal bell. Yes, pcspkr is loaded, yes, sound works fine. BUt the terminal beep is missing. Any hints? Adrian -- Adri P. van Bloois Antonlaan 104 email: adrian(a)pa0rda.nl 3701 VG Zeist voice: +31-(0)-30-6912741 The Netherlands fax: NONE 52 05'15.77"N 5 4'44.56"E QTH-locater JO 22 OC The whole point of cooking is to get as much flavour out of the ingredients as possible. -- Delia Smith

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Is X79 Motherboard supported by latest "Centos 5.9" version?
by Steve Brooks 26 Aug '13

26 Aug '13

Hi Guys, In a bit of a pickle.. Is anyone running the latest "Centos 5.9" or earlier version with an Intel X79 based motherboard. I have a server which needs the motherboard replacing asap and I have a spare "Sabertooth X79". I have a machine with a "Sabertooth X79" motherboard to test on which boots up fine on on "Centos 5.9 i386" image from the troubled server. However the output from "lspci" (see below) seems far less descriptive than you normally see in "Centos 5" or "Centos 6". I am just a bit worried that this might imply lack of support. I do not need audio/firewire.. but need the essential to work memory, sata etc. Also I thought "i386" installs could not see more than 3 and a bit Gigs of ram? The test machine has 32G and meminfo shows MemTotal: 3574676 kB MemFree: 3146556 kB I would really appreciate any advice. Regards Steve e.g. The output from "Sabertooth X79" and "Centos 5.9" gives 00:00.0 Host bridge: Intel Corporation Device 3c00 (rev 06) 00:01.0 PCI bridge: Intel Corporation Device 3c02 (rev 06) 00:02.0 PCI bridge: Intel Corporation Device 3c04 (rev 06) 00:03.0 PCI bridge: Intel Corporation Device 3c08 (rev 06) 00:05.0 System peripheral: Intel Corporation Device 3c28 (rev 06) 00:05.2 System peripheral: Intel Corporation Device 3c2a (rev 06) 00:05.4 PIC: Intel Corporation Device 3c2c (rev 06) 00:11.0 PCI bridge: Intel Corporation Device 1d3e (rev 05) 00:16.0 Communication controller: Intel Corporation Device 1d3a (rev 05) 00:19.0 Ethernet controller: Intel Corporation Device 1503 (rev 05) 00:1a.0 USB Controller: Intel Corporation Device 1d2d (rev 05) 00:1b.0 Audio device: Intel Corporation Device 1d20 (rev 05) 00:1c.0 PCI bridge: Intel Corporation Device 1d10 (rev b5) 00:1c.1 PCI bridge: Intel Corporation Device 1d12 (rev b5) 00:1c.2 PCI bridge: Intel Corporation Device 1d14 (rev b5) 00:1c.3 PCI bridge: Intel Corporation Device 1d16 (rev b5) 00:1c.4 PCI bridge: Intel Corporation Device 1d18 (rev b5) 00:1c.5 PCI bridge: Intel Corporation Device 1d1a (rev b5) 00:1c.7 PCI bridge: Intel Corporation Device 1d1e (rev b5) 00:1d.0 USB Controller: Intel Corporation Device 1d26 (rev 05) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a5) 00:1f.0 ISA bridge: Intel Corporation Device 1d41 (rev 05) 00:1f.2 SATA controller: Intel Corporation Device 1d02 (rev 05) 00:1f.3 SMBus: Intel Corporation Device 1d22 (rev 05) 01:00.0 VGA compatible controller: nVidia Corporation Device 104a (rev a1) 01:00.1 Audio device: nVidia Corporation Device 0e08 (rev a1) 06:00.0 USB Controller: Device 1b21:1042 07:00.0 USB Controller: Device 1b21:1042 08:00.0 USB Controller: Device 1b21:1042 09:00.0 SATA controller: Device 1b21:0612 (rev 01) 0a:00.0 FireWire (IEEE 1394): VIA Technologies, Inc. Device 3403 (rev 01) 0b:00.0 SATA controller: Device 1b4b:9130 (rev 11) ff:08.0 System peripheral: Intel Corporation Device 3c80 (rev 06) ff:08.3 System peripheral: Intel Corporation Device 3c83 (rev 06) ff:08.4 System peripheral: Intel Corporation Device 3c84 (rev 06) ff:09.0 System peripheral: Intel Corporation Device 3c90 (rev 06) ff:09.3 System peripheral: Intel Corporation Device 3c93 (rev 06) ff:09.4 System peripheral: Intel Corporation Device 3c94 (rev 06) ff:0a.0 System peripheral: Intel Corporation Device 3cc0 (rev 06) ff:0a.1 System peripheral: Intel Corporation Device 3cc1 (rev 06) ff:0a.2 System peripheral: Intel Corporation Device 3cc2 (rev 06) ff:0a.3 System peripheral: Intel Corporation Device 3cd0 (rev 06) ff:0b.0 System peripheral: Intel Corporation Device 3ce0 (rev 06) ff:0b.3 System peripheral: Intel Corporation Device 3ce3 (rev 06) ff:0c.0 System peripheral: Intel Corporation Device 3ce8 (rev 06) ff:0c.1 System peripheral: Intel Corporation Device 3ce8 (rev 06) ff:0c.2 System peripheral: Intel Corporation Device 3ce8 (rev 06) ff:0c.6 System peripheral: Intel Corporation Device 3cf4 (rev 06) ff:0c.7 System peripheral: Intel Corporation Device 3cf6 (rev 06) ff:0d.0 System peripheral: Intel Corporation Device 3ce8 (rev 06) ff:0d.1 System peripheral: Intel Corporation Device 3ce8 (rev 06) ff:0d.2 System peripheral: Intel Corporation Device 3ce8 (rev 06) ff:0d.6 System peripheral: Intel Corporation Device 3cf5 (rev 06) ff:0e.0 System peripheral: Intel Corporation Device 3ca0 (rev 06) ff:0e.1 Performance counters: Intel Corporation Device 3c46 (rev 06) ff:0f.0 System peripheral: Intel Corporation Device 3ca8 (rev 06) ff:0f.1 System peripheral: Intel Corporation Device 3c71 (rev 06) ff:0f.2 System peripheral: Intel Corporation Device 3caa (rev 06) ff:0f.3 System peripheral: Intel Corporation Device 3cab (rev 06) ff:0f.4 System peripheral: Intel Corporation Device 3cac (rev 06) ff:0f.5 System peripheral: Intel Corporation Device 3cad (rev 06) ff:0f.6 System peripheral: Intel Corporation Device 3cae (rev 06) ff:10.0 System peripheral: Intel Corporation Device 3cb0 (rev 06) ff:10.1 System peripheral: Intel Corporation Device 3cb1 (rev 06) ff:10.2 System peripheral: Intel Corporation Device 3cb2 (rev 06) ff:10.3 System peripheral: Intel Corporation Device 3cb3 (rev 06) ff:10.4 System peripheral: Intel Corporation Device 3cb4 (rev 06) ff:10.5 System peripheral: Intel Corporation Device 3cb5 (rev 06) ff:10.6 System peripheral: Intel Corporation Device 3cb6 (rev 06) ff:10.7 System peripheral: Intel Corporation Device 3cb7 (rev 06) ff:11.0 System peripheral: Intel Corporation Device 3cb8 (rev 06) ff:13.0 System peripheral: Intel Corporation Device 3ce4 (rev 06) ff:13.1 Performance counters: Intel Corporation Device 3c43 (rev 06) ff:13.4 Performance counters: Intel Corporation Device 3ce6 (rev 06) ff:13.5 Performance counters: Intel Corporation Device 3c44 (rev 06) ff:13.6 System peripheral: Intel Corporation Device 3c45 (rev 06)

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Fastest way of removing very large number of files?
by Rafał Radecki 24 Aug '13

24 Aug '13

Hi All. I currently have a problem on my backup server with very large number of small files in a large number of directories. I would like to delete them as fast as possible. Currently I use: rsync -a --delete /empty_directory/ dir_to_clean/ I've read that rsync will be faster than rm or find. Can you recommend something? I use an ext4 filesystem. Best regards, Rafal.

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Looking for a tutorial or manpage describing sysctl params
by adrian＠pa0rda.nl 24 Aug '13

24 Aug '13

Hi, I'm looking for a toturial or manpage describing all the thing that you can set with sysctl on RHEL 6 or CentOS 6. It apperas the the default /etc/sysctl.conf coming with the distribution gives a couple of errors on bridgen. Any hints??? Adrian -- Adri P. van Bloois Antonlaan 104 email: adrian(a)pa0rda.nl 3701 VG Zeist voice: +31-(0)-30-6912741 The Netherlands fax: NONE 52 05'15.77"N 5 4'44.56"E QTH-locater JO 22 OC The whole point of cooking is to get as much flavour out of the ingredients as possible. -- Delia Smith

3 2

fsck.ext4 Failed to optimize directory
by Joakim Ziegler 24 Aug '13

24 Aug '13

I had a rather large ext4 partition on an Areca RAID shut down uncleanly while it was writing. When I mount it again, it recommends fsck, which I do, and I get the following error: Failed to optimize directory ... EXT2 directory corrupted This error shows up every time I run fsck.ext4 on this partition. How can I fix this? The file system seems to work ok otherwise, I can mount it and it doesn't complain, using it looks like it's ok, etc. -- Joakim Ziegler - Supervisor de postproducción - Terminal joakim(a)terminalmx.com - 044 55 2971 8514 - 5264 0864

2 2

LVM RAID0 and SSD discards/TRIM
by Joakim Ziegler 24 Aug '13

24 Aug '13

I'm trying to work out the kinks of a proprietary, old, and clunky application that runs on CentOS. One of its main problems is that it writes image sequences extremely non-linearly and in several passes, using many CPUs, so the sequences get very fragmented. The obvious solution to this seems to be to use SSDs for its output, and some scripts that will pick up and copy our the sequences in proper order once it's done. I have two 512GB SSDs, and I've used LVM to set up a RAID0 between them. I've got that part running, but since I'm on CentOS 5.8 (which is what this application officially supports), I don't have a kernel with SSD discard support, and after a few days (I told you, this application is write intensive), things get very slow. Using hdparm to secure erase the drives and recreating the LVM RAID0 gets things back to speed again, but that's obviously not ideal. So, from what I understand, if I can get this thing running on CentOS 6.4, I'll get kernel discard support, and discard support in LVM when running a RAID0. I'm using ext4. Is that correct? Will this solve my problem? I want to confirm that discard support works on a RAID0 of SSDs using LVM and ext4 before I start working on getting this legacy application to run on a newer CentOS. -- Joakim Ziegler - Supervisor de postproducción - Terminal joakim(a)terminalmx.com - 044 55 2971 8514 - 5264 0864

5 8

Setting Up LVS to Load Balance DNS
by Trevor Kates 23 Aug '13

23 Aug '13

Greetings, all: OS: CentOS 6.4 x86_64 Kernel: 2.6.32-358.14.1 I could use some assistance with setting up pulse to load balance my dns servers. I've configured tcp and udp port 53 with the piranha gui, set up arptable rules on the real servers and added the virtual ip to the bond0 interface on the real servers, but I'm still having no luck in getting things going. A dig against the virtual ip address simply times out and ipvsadm shows no servers under the UDP connection for the virtual IP I defined in lvs.cf. Nanny also complains in /var/log/messages like so: READ to x.x.x.x timed out I've attached my lvs.cf and sysctl.conf files for the lvs server and real dns servers. Any help or nudges in the right direction would be greatly appreciated! Thanks. --

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JOB | (Amsterdam, the Netherlands) | Linux Systems Administrator (take ownership of hardware procurement and supplier relationships)
by james tobin 23 Aug '13

23 Aug '13

Hello, I am working with an employer that is looking to hire a Linux systems administrator (with an automation and scripting approach) to take ownership of hardware procurement and supplier relationships. This is a permanent job based in Amsterdam, the Netherlands (relocation assistance is available). Consequently should any members of this list like to discuss with me further; they may reach me off-list using "JamesTobin (at) Linuxmail (dot) org". All the best, James

1 0

Make server reboot by itself instead of dropping to kernel debugger
by Alexander Farber 23 Aug '13

23 Aug '13

Hello, on OpenBSD if you put ddb.panic=0 into /etc/sysctl.conf, the server won't drop into debugger on kernel panic. Is there please a similar setting for CentOS 6.4 / 64 bit? The background is that I have a new dedicated server with Haswell CPU and once a month it is stuck, displaying kernel trace (the other users at my hoster have similar problems). So the users of my web site complain. I'd prefer my web server to just reboot Thank you Alex

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