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KVM, virsh attach-disk error
by Jussi Hirvi 23 Apr '11

23 Apr '11

I try to add a fresh, unformatted disk partition to a KVM guest. I follow the directions given here: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Vi… First I check that the module acpiphp is present on the guest. It is. On the host I write: virsh attach-disk test1 /dev/sdb1 sda --driver tap --mode shareable - test1 is my guest domain - /dev/sdb1 is the name of the unformatted partition on the host - sda is what it is supposed to be called on the guest (the name is unused on the guest) - the example in RHEL Virtualization guide says "--mode readonly". This does not sound right for a hard disk; hence I try "--mode shareable"; the error (see below) however is the same, whichever I use Now, the command above produces this error. I find no google results with this error text. Can someone tell, what causes the error? > error: Failed to attach disk error: operation failed: adding scsi > disk controller failed: type scsi not a hotpluggable PCI device. > failed to add if=scsi - Jussi -- Jussi Hirvi * Green Spot Suvilahdenkatu 1 B 78 * 00500 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

2 4

can not install CentOS as VM in KVM
by Michael Zoet 23 Apr '11

23 Apr '11

Hi to all, I am trying to install CentOS 5.5 as VM on a KVM server running Ubuntu 10.04. The Problem: the installer does not find the iso image. (Direct copy from website downlod.) I can start CentOS from the iso and can even do some disk checks. But when I go further the installer says "no CDROm found". Pretty weird. I tried all CentOS 5.5. image available (Live CD, net install, bin 1 of 8, 32 bit and 64 bit). Other installation (Debin, Ubuntu, SLES, Windows XP, Windows 7, Windows Server 2008) worked fine. Perhaps somebody can help me in setting things up for that. Michael

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Valgrind/Callgrind 3.6.1 does not appear to work on Centos Linux 5.5
by Frank Chang 22 Apr '11

22 Apr '11

Hi, For the last day or two I having been trying to get Valgrind/Callgrind 3.6.1 to work on Centos Linux 5.5 using a simple Fibonacci C++ program(shown below). After compiling the program using g++ -g -o MatchUpAccurate MatchUpAccurate.cpp, we run: /home/frankc/DQTTest/valgrind-3.6.1/coregrind/valgrind --tool=callgrind --dump-instr=yes --simulate-cache=yes --collect-jumps=yes ./MatchUpAccurate.exe. Then we get an error message from callgrind(shown below). A programmer sent me an email showing me that my test program is profiled correctly on Ubuntu. I received an email from a programmer yesterday who thinks the reason that callgrind is not able to profile my C++ program on Centos Linux Version 5.5 is because of an libc conflict. "what is the version of libc on the host? Is it a vm or physical? I guess it is gonna be a ABI/version conflict of libc. If you cannot figure it out, just report it. Chances are, a dev will be able to tell you in 5 seconds." In order to determine what version of libc is on the Centos Linux 5.5 host, I tried: rpm -qa | grep glibc. The answer was: glibc-devel-2.5-49.el5_5.7 glibc-2.5-49.el5_5.7 glibc-headers-2.5-49.el5_5.7 glibc-common-2.5-49.el5. We were wondering if anyone has been able to run Valgrind/Callgrind 3.6.1 on Centos Linux 5.5? Thank you. // Callgrind error message ==18130== Callgrind, a call-graph generating cache profiler ==18130== Copyright (C) 2002-2010, and GNU GPL'd, by Josef Weidendorfer et al. ==18130== Using Valgrind-3.6.1 and LibVEX; rerun with -h for copyright info ==18130== Command: ./MatchUpAccurate.exe ==18130== --18130-- warning: Pentium 4 with 12 KB micro-op instruction trace cache --18130-- Simulating a 16 KB I-cache with 32 B lines ==18130== For interactive control, run 'callgrind_control -h'. std::ios_base::Init::Init() BB# 215387 Callgrind: jumps.c:164 (new_jcc): Assertion '(0 <= jmp) && (jmp <= from->bb->cjmp_count)' failed. ==18130== at 0x3801E4C8: report_and_quit (m_libcassert.c:193) ==18130== by 0x3801E69C: vgPlain_assert_fail (m_libcassert.c:267) ==18130== by 0x3800FCD9: vgCallgrind_get_jcc (jumps.c:164) ==18130== by 0x38003534: vgCallgrind_push_call_stack (callstack.c:217) ==18130== by 0x38001FDB: vgCallgrind_setup_bbcc (bbcc.c:844) ==18130== by 0x6292A7E3: ??? sched status: running_tid=1 Thread 1: status = VgTs_Runnable ==18130== at 0x3E30CB0: std::ios_base::Init::Init() (in /usr/lib/libstdc++.so.6.0.8) ==18130== by 0x3EA0125: ??? (in /usr/lib/libstdc++.so.6.0.8) ==18130== by 0x3E22BD0: ??? (in /usr/lib/libstdc++.so.6.0.8) ==18130== by 0xAE2162: call_init (in /lib/ld-2.5.so) ==18130== by 0xAE2272: _dl_init (in /lib/ld-2.5.so) ==18130== by 0xAD484E: ??? (in /lib/ld-2.5.so) // Test program MatchUpTest.cpp int fibonacci(int n){ if (n == 0) return 0; else if (n == 1) return 1; else return fibonacci(n - 1) + fibonacci(n-2); } int main(int Argc_,char *Argv_[]) { fibonacci(10); return 1; }

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Re: [CentOS] QT and oprofile on Centos Linux 5.5
by Frank Chang 22 Apr '11

22 Apr '11

Philip Schaffner, Thank you for your reply. I guess we will have to wait until Centos 6 arrives to get a working QT. Did you see Nicolas Thierry-Mieg's response regarding yum install oprofile-gui. We were able to install oprofile-guii.i386 0:0.9.4-15.el5.centos and oprofile.i386 0.0.9.4.15.el.5.centos. Thank you.

1 0

GFS2 performance
by Arnts, Leo 22 Apr '11

22 Apr '11

Hi, I'm trying to get more performance out of my DRBD cluster with gfs2. It seems that our gfs2 implementation is quit slow. When running the ping_pong test we get no more than a 1000 locks/sec on the disk. ./ping_pong /mnt/backup/test.dat 4 879 locks/sec The cluster config has been updated with: <dlm plock_ownership="1" plock_rate_limit="0"/> <gfs_controld plock_rate_limit="0"/> gfs2_tool getargs /mnt/backup statfs_percent 0 data 2 suiddir 0 quota 0 posix_acl 0 upgrade 0 debug 0 localflocks 0 localcaching 0 ignore_local_fs 0 spectator 0 hostdata jid=1:id=2752514:first=0 locktable lockproto gfs2_tool df -H /mnt/backup: SB lock proto = "lock_dlm" SB lock table = "cybercenter:backup" SB ondisk format = 1801 SB multihost format = 1900 Block size = 4096 Journals = 2 Resource Groups = 7451 Mounted lock proto = "lock_dlm" Mounted lock table = "cybercenter:backup" Mounted host data = "jid=1:id=2752514:first=0" Journal number = 1 Lock module flags = 0 Local flocks = FALSE Local caching = FALSE Type Total Used Free use% ------------------------------------------------------------------------ data 3T 1T 1T 47% inodes 1T 96M 1T 0% Hdparm information of the disk: hdparm -tT /dev/sdb /dev/sdb: Timing cached reads: 20988 MB in 2.00 seconds = 10512.28 MB/sec Timing buffered disk reads: 74 MB in 3.05 seconds = 24.30 MB/sec Has someone an idea about increasing the performance of my gfs2 filesystem? Kind Regards, Leo Arnts

1 0

How to merge many LDAP Servers to the One Server
by sync 22 Apr '11

22 Apr '11

Hi , all : I have many LDAP Servers which are 389 LDAP Server on different network . So I want to merge them to the one server. Could someone can give some suggestions? Thanks in advance...

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Re: [CentOS] How to install binutils-devel on Centos Linux5.5
by Frank Chang 22 Apr '11

22 Apr '11

Simon Matter and Ned Slider, Thank you for your answers. This afternoon , I installed binutils-devel on Centos Linux 5.5. Then , I installed all the QT packages except for the two QT client packages. When I ran ./configure --with-kernel-support on the OProfile Linux profiler distribution 0.9.6, I get the warning: a working QT was not found: no GUI was built. How do I resolve this issue on Centos Linux 5.5? Thank you.

3 2

iscsi multipath fails
by Adam Wead 22 Apr '11

22 Apr '11

Hi all, I have a Dell server running cent 5.6, new install, connecting to an IBM DS3500. I have configured iscsi connections using iscsid and can log into the targets on the IBM. I can also mount the LUNs when accessing them from their active controller path. When I throw multipath into the mix, it fails completely. Multipath is working, when I run multipath -ll it shows me the correct active path and it is mapped to a device under /dev/mapper. However, if I try to access the device from that path, no luck. A mount request just hangs and eventually there's a kernel error message. I'm using the native rdac drivers that came with the OS. Anyone using something similar? My guess is that it's either bad drivers, or a bad multipath config. I started with the default, but after tweaking different parameters, it's still not working. Any advice is greatly appreciated. thanks, Adam Wead

3 2

KVM virt-install on disk image - "no space"
by Jussi Hirvi 21 Apr '11

21 Apr '11

I guess I need the list again. I try to install my first KVM guest. Here is what I do, and finally, what I stumble on. First I created a qcow2 img: # qemu-img create -f qcow2 /var/lib/libvirt/images/test1.img 15G And I created a network bridge (not essential here) To get a text-based install, I followed this how-to: http://sysadminman.net/blog/2011/kvm-virtualization-text-centos-guest-insta… My install command was: virt-install \ --name test1 \ --os-variant=rhel5.4 \ --ram 512 \ --vcpus=1 \ --accelerate \ --nographics \ -v \ --location=/mnt/centos56/ \ --network bridge:br0 \ --disk path=/var/lib/libvirt/images/test1.img,size=15 \ --extra-args="console=ttyS0"; I tried this also without the "size" argument for "disk" Now, the install begins ok. I do a http install from a nearby mirror. BUT when it is time to do partitions, I get > Which drive(s) do you want to use for this installation? | > | [*] vda 0 MB (Unknown) ^ | > | And if I now try to create partitions, I get "no space" error. What is going on?? Cheers to CentOS! - Jussi -- Jussi Hirvi * Green Spot Suvilahdenkatu 1 B 78 * 00500 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

3 4

User accounts management for small office
by Jeff Boyce 21 Apr '11

21 Apr '11

Greetings - This may be a little off-topic here so if someone wants to point me to a more appropriate mailing list I would appreciate it. I administer the network for my small company and am preparing to install a new server in the next month or so. It will be running CentOS 6 and function primarily as a Samba file server to 10 Windows workstations (XP, Vista, 7). It will also host our OpenVPN server and possibly our FTP server; however I am hoping to move our FTP server to a gateway box when the new server is installed. The issue that I would like to be able to resolve when the new server is installed, is that currently if a user wants to change the password on their Windows workstation, I have to manually update that new password on the Linux user account, and also manually change the Samba user account. Manually updating the password in three different locations is a minor headache that I would like to correct. I have been researching and reading lots of information about account management to try and understand what is available, and what would be the best fit for my network size. Much of what I have read is related to larger networks or larger user bases, which seem to have a lot of extraneous stuff that would be unnecessary in my small user environment. I looked into OpenLDAP, and have recently been reading about Samba/Winbind. But after encountering the following statement in the Samba documentation, I am still lost about what I could, or should, be using. "A standalone Samba server is an implementation that is not a member of a Windows NT4 domain, a Windows 200X Active Directory domain, or a Samba domain. By definition, this means that users and groups will be created and controlled locally, and the identity of a network user must match a local UNIX/Linux user login. The IDMAP facility is therefore of little to no interest, winbind will not be necessary, and the IDMAP facility will not be relevant or of interest." My only goal is to be able to allow my users to change their Windows password at their workstation and have it perpetuate through the system so that it also changes their Linux User and Samba User account passwords. I don't expect to ever have more than a dozen users, so I want something that fits our size network and is simple to administer. I am not looking for a how-to to set something up, but some opinions about what I should consider using, and why it would be a good fit to achieve my goal. I can do the additional research to understand configuration once I know what I should be researching. Thanks. Please cc me directly, as I only get the list in daily digest mode. Jeff Boyce Meridian Environmental

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