Discuss April 2010

discuss@lists.centos.org

265 participants
237 discussions

OT: Caching synchronous writes
by Ray Van Dolson 24 Apr '10

24 Apr '10

[ Wish there was a generic, active Linux "storage" mailing list out there -- something other than the kernel lists I mean ] To frame the discussion, we use VMware ESX (vSphere) quite a bit with NFS datastores. Often times with NetApp, but lately, more often with Solaris 10 + ZFS + SSD's for ZIL (intent log or write cache). The ZIL lets us use synchronous writes (safer) without the normal delay. Were we to try and get the same level of performance with Linux, we'd need to use async mode for our NFS shares -- and we'd lose some reliability. However, given the latest rumblings and ruminations about Oracle potentially no longer selling entitlements for Solaris 10 on non-Sun hardware -- and then turning around and no longer allowing you to run Solaris 10 "freely", we're left with either OpenSolaris or looking at Linux again (we run Solaris 10 on Silicon Mechanics hardware). My question is, what are the various options for getting NFS in "sync" mode to run fast on Linux? Obviously we can buy a really nice disk controller with lots of cache, but I'm thinking more at the filesystem, volume manager or block driver layer. Is there a way to shunt write requests to a quicker medium like an SLC-based SSD (or NVRAM)? I don't see a way to do this with LVM, ext3/ext4 or even xfs... maybe btrfs will have some options along this line down the road, but that's tomorrow and not today. So is a beefy disk controller our best option? Even using our 3Ware 9650's w/ BBU so we can enable write-back doesn't seem to give us as good of write performance via NFS as ZFS+ZIL-on-SSD does... Ray

7 19

Problem shuting down server.
by Enrique Verdes 24 Apr '10

24 Apr '10

Have Centos 5.3 installed in a HP ML110 server. After cloning disk using Clonezilla, if I issue a shutdown -h now, or any other command to shut down the server (i.e. init 0 or poweroff), instead of shutting down the server reboots. I googled but could't find any answer. ¿Does anybody has a clue about why this is happening? -- Enrique Verdes <EVerdes(a)conatel.com.uy> Depto. de Ingeniería - CONATEL S.A. Este mensaje es privado y confidencial y tiene como único destinatario la persona a la que va dirigida. La responsabilidad de su contenido es del remitente y no de CONATEL. Si usted ha recibido este mensaje por error, tenga presente que le está prohibido revelarlo, copiarlo o distribuirlo, debiendo avisar de inmediato al remitente y borrarlo de su sistema. El error de transmisión no implica renuncia a la privacidad y confidencialidad. This email is private and confidential and intended solely for the use of the individual to whom it is addressed. The responsibility of its content is the sender's and not CONATEL'S. If you have received this email by mistake please notify the sender immediately and delete it from your system. Its disclosure, copy or distribution is absolutely forbidden. The transmission error does not imply a waiver of privacy and confidentiality.

2 1

iptables
by cahit Eyigünlü 24 Apr '10

24 Apr '10

how could i add / remove iptable rules on cet os 5.4 final for tcp / udp base on ports

7 9

Can no longer print
by Anne Wilson 23 Apr '10

23 Apr '10

My server has CentOS 5.4. I had hplip-2.7.12 installed and running, as earlier versions didn't work with my printers, and was able to print to a networked printer. As far as I'm aware, that's the version that was still running last time I printed. Recently I decided to add a local USB printer, and at that point discovered that I can no longer print. I've no idea how long this has been so. Rightly or wrongly, I decided that something must have seriously upset hplip, so I removed it and re-installed it. Unfortunately it hasn't cured anything. I have the correct ppd files for both printers, and CUPS lists them. If I step through the CUPS Modify Printer pages everything looks correct, but when I try to send a test page I see "usr/lib/cups/filter/foomatic-rip failed". Running 'hp-check -t' tells me that libcrypto is a required dependency and I don't have it. 'rpm --redhatprovides libcrypto' says that no package provides it, and no package of that name is listed. Where can I get it? Similarly, ppdev and ReportLab are essential but missing. I have printed from this server in the past, but I can't get it sorted this time. I can't even find any uninstall file for hplip, and it doesn't appear in the rpm database. Is there any way I can get this working again? Thanks Anne

5 5

Adding ps2pdf support on centos
by premrajm＠digilink.in 23 Apr '10

23 Apr '10

Hi, I wanted to install the ghostscript for ps2pdf support. I wanted to know the required rpms for this and also the order of installation. As of now i don't have this support on my system. Please provide me with information on this. Disclaimer : This message is proprietary to Smartlink Network Systems Ltd. and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. The company accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus. ______________________________________________________________________________ This email has been scrubbed for your protection by SecureMX. For more information visit http://securemx.in ______________________________________________________________________________

4 3

vmcore on 5.4
by My LinuxHAList 23 Apr '10

23 Apr '10

Information: 5.4 kernel (2.6.18-164.el5). I have a vmcore (from kdump), if the developers are interested, let me know a place to upload the vmcore file. I used the crash command to do a backtrace. I manage to get machines with later 5.4 and 5.5 to panic the same way. Broadcom or Intel NICs panic the same way. This is an NFS client where the NFS server is restarting several times; NFSv3, mount it with defaults,noatime. The client was busy writing things on NFS-mounted space while the NFS servers was restarting several times. So far, if I mount it with udp option, I've not managed to panic the machines. The bad news is that NFSv4 is strictly TCP, if I were to go down that route. >From the backtrace, it seems the crash is TCP-related. I'll be trying couple Linux TCP settings changes. It's a possibility that the issues are with TCP in general (not NFS). I would like to enlist community's help in further understanding this and potential work-arounds with this TCP issues. crash> sys KERNEL: vmlinux DUMPFILE: vmcore CPUS: 4 DATE: Tue Apr 20 15:04:09 2010 UPTIME: 18:55:25 LOAD AVERAGE: 0.13, 0.09, 0.03 TASKS: 340 RELEASE: 2.6.18-164.el5 VERSION: #1 SMP Thu Sep 3 03:28:30 EDT 2009 MACHINE: x86_64 (2660 Mhz) MEMORY: 23.6 GB PANIC: "Oops: 0000 [1] SMP " (check log for details) crash> bt -a PID: 0 TASK: ffffffff802ffae0 CPU: 0 COMMAND: "swapper" #0 [ffffffff8043ef20] crash_nmi_callback at ffffffff8007a3bf #1 [ffffffff8043ef40] do_nmi at ffffffff8006585a #2 [ffffffff8043ef50] nmi at ffffffff80064ebf [exception RIP: acpi_processor_idle+579] RIP: ffffffff8019765e RSP: ffffffff803f1f48 RFLAGS: 00000093 RAX: 000000000073111a RBX: 000000000073111a RCX: 0000000000000808 RDX: 0000000000000815 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffff81063e480100 R8: ffffffff803f0000 R9: ffffffff804b5e2c R10: 0000000000000046 R11: 0000000000000046 R12: 0000000000000000 R13: ffff81063e480000 R14: 0000000000000000 R15: 0000000000000000 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 --- <exception stack> --- #3 [ffffffff803f1f48] acpi_processor_idle at ffffffff8019765e #4 [ffffffff803f1f90] cpu_idle at ffffffff8004939e PID: 0 TASK: ffff810115f11100 CPU: 1 COMMAND: "swapper" #0 [ffff810115f38f20] crash_nmi_callback at ffffffff8007a3bf #1 [ffff810115f38f40] do_nmi at ffffffff8006585a #2 [ffff810115f38f50] nmi at ffffffff80064ebf [exception RIP: acpi_processor_idle+579] RIP: ffffffff8019765e RSP: ffff810115f2fea8 RFLAGS: 00000093 RAX: 0000000000731145 RBX: 0000000000731145 RCX: 0000000000000808 RDX: 0000000000000815 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffff81063f173900 R8: ffff810115f2e000 R9: ffffffff804b5e2c R10: 0000000000000046 R11: 0000000000000046 R12: 00000000000000ff R13: ffff81063f173800 R14: 0000000000000100 R15: ffffffff803ea280 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 --- <exception stack> --- #3 [ffff810115f2fea8] acpi_processor_idle at ffffffff8019765e #4 [ffff810115f2fef0] cpu_idle at ffffffff8004939e PID: 0 TASK: ffff810115f20080 CPU: 2 COMMAND: "swapper" #0 [ffff810115f6bbc0] crash_kexec at ffffffff800ac5b9 #1 [ffff810115f6bc80] __die at ffffffff80065127 #2 [ffff810115f6bcc0] do_page_fault at ffffffff80066da7 #3 [ffff810115f6bdb0] error_exit at ffffffff8005dde9 [exception RIP: pskb_copy+307] RIP: ffffffff8022486b RSP: ffff810115f6be60 RFLAGS: 00010282 RAX: ffff81062cd5f540 RBX: ffff81062cac3980 RCX: ffff81046fb1e550 RDX: 0000000000000000 RSI: ffff81062cd5f550 RDI: 0000000000000004 RBP: ffff810466f54a80 R8: 00000000081f02b4 R9: 0000000000000000 R10: ffff81062cac3980 R11: 00000000000000c8 R12: 0000000000000220 R13: ffff810466f54a80 R14: 0000000000000002 R15: ffffffff803ea2a0 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #4 [ffff810115f6be78] tcp_transmit_skb at ffffffff800217b7 #5 [ffff810115f6bec8] tcp_retransmit_skb at ffffffff80250ccd #6 [ffff810115f6bf08] tcp_write_timer at ffffffff80252652 #7 [ffff810115f6bf28] run_timer_softirq at ffffffff800968be #8 [ffff810115f6bf58] __do_softirq at ffffffff8001235a #9 [ffff810115f6bf88] call_softirq at ffffffff8005e2fc #10 [ffff810115f6bfa0] do_softirq at ffffffff8006cb14 #11 [ffff810115f6bfb0] apic_timer_interrupt at ffffffff8005dc8e --- <IRQ stack> --- #12 [ffff810115f67df8] apic_timer_interrupt at ffffffff8005dc8e [exception RIP: acpi_processor_idle+628] RIP: ffffffff8019768f RSP: ffff810115f67ea8 RFLAGS: 00000282 RAX: ffff810115f67fd8 RBX: ffff81063f173100 RCX: 0000000080184973 RDX: ffff81063f173000 RSI: 0000000000000082 RDI: ffffffff804b5e2c RBP: ffff810115f67ee8 R8: ffff810115f66000 R9: ffff810115f67ecc R10: 0000000000000046 R11: ffff810115f67ee8 R12: ffff81063f6e1180 R13: 0000000010008040 R14: ffff81063f6e1180 R15: ffff81063f6e1180 ORIG_RAX: ffffffffffffff10 CS: 0010 SS: 0018 #13 [ffff810115f67ea0] acpi_processor_idle at ffffffff80197685 #14 [ffff810115f67ef0] cpu_idle at ffffffff8004939e PID: 0 TASK: ffff810115f94100 CPU: 3 COMMAND: "swapper" #0 [ffff810115fbbf20] crash_nmi_callback at ffffffff8007a3bf #1 [ffff810115fbbf40] do_nmi at ffffffff8006585a #2 [ffff810115fbbf50] nmi at ffffffff80064ebf [exception RIP: acpi_processor_idle+579] RIP: ffffffff8019765e RSP: ffff810115fb9ea8 RFLAGS: 00000097 RAX: 0000000000731169 RBX: 0000000000731169 RCX: 0000000000000808 RDX: 0000000000000815 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffff81063f174900 R8: ffff810115fb8000 R9: ffff810115f942f0 R10: 0000000000000046 R11: 0000000000000046 R12: 00000000000000ff R13: ffff81063f174800 R14: 0000000000000300 R15: ffffffff803ea2c0 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 --- <exception stack> --- #3 [ffff810115fb9ea8] acpi_processor_idle at ffffffff8019765e #4 [ffff810115fb9ef0] cpu_idle at ffffffff8004939e crash> quit

1 0

scripting CPAN installs
by Alan McKay 23 Apr '10

23 Apr '10

Hey folks, Maybe there is a Perl/CPAN list that is a better place to ask this? If so, maybe someone can point me to it. Anyway, I want to be able to script the installation of a bunch of CPAN modules, and the first basic problem I am coming up against is that the "cpan" command seems to always return 0 regardless of whether or not the install completed. Google does not bring up a whole lot of help for me here, but I have to think this problem has already been solved. Thanks for any guidance you can give. -Alan -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

9 25

rpm -U query
by Steve Thompson 23 Apr '10

23 Apr '10

CentOS, RHEL, all versions. Suppose I am upgrading a package foo-1.0 to foo-2.0 (assume foo is not relocatable), and both packages have %preun sections in their .spec files. It appears that foo-1.0's %preun is run after foo-2.0 has been installed. So what happens if foo-1.0 needs to run a binary that was provided as part of foo-1.0 during its %preun stage, and a binary of the same name is provided with foo-2.0? The installed binary is now foo-2.0's, right? So how to run foo-1.0's binaries during its %preun stage? Is the old binary available under a different name before it gets erased? -steve

2 2

centOS vs "the upstream vendor"
by Kevin Kempter 23 Apr '10

23 Apr '10

Hi All; I have a laptop running the "workstation" version of Linux from RedHat. I've enabled the EPEL and rpmfusion repos plus I'm subscribed to the following channels: * Red Hat Enterprise Linux Desktop (v. 5 for 64-bit x86_64) * Red Hat Network Tools for RHEL Client (v.5 64-bit x86_64) * RHEL Desktop Supplementary (v. 5 for 64-bit x86_64) * RHEL Desktop Workstation FasTrack (v. 5 for 64-bit x86_64) * RHEL Desktop Workstation (v. 5 for 64-bit x86_64) * RHEL Desktop FasTrack (v. 5 for 64-bit x86_64) I have openioffice version 3.1.1 I also have 2 employees running fully patched 5.4 CentOS. They also have the EPEL and rpmfusion repos enabled as well as the centos plus repo. They however have openoffice version 2.3.0 I *thought* that CentOS was basically the equivelant of RHEL. did we do something wrong? or is RHEL (at least in the case of openoffice) shipping a newer release than CentOS? Thanks in advance...

2 1

RHEL 6 beta manuals online
by Radu Radutiu 23 Apr '10

23 Apr '10

Hi, I've just noticed that the RHEL 6 beta manuals are online at http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6-Beta/ I thought you might be interested :) Regards, Radu

10 17

← Newer
1
2
3
4
5
6
7
8
9
...
24
Older →

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Discuss April 2010