Discuss April 2011

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283 discussions

Two cleanly installed CentOS 5.6 servers but with different Xen kernel versions
by Hans Vos 15 Apr '11

15 Apr '11

Hello, Earlier this week I installed a test server with CentOS 5.6 with Virtualization enabled during the installer. Today I installed another server using the same method (they are identical servers). I just did a yum update and I found something curious. Both servers have a different kernel. Server 1 is at 9.1 version and server 2 at 5.1. How can this be? How to I get the latest version on server 2? If I run yum update there are none available. If I input xm info I get this one server 1: host : server1 release : 2.6.18-238.9.1.el5xen version : #1 SMP Tue Apr 12 18:53:56 EDT 2011 machine : x86_64 nr_cpus : 4 nr_nodes : 1 sockets_per_node : 1 cores_per_socket : 4 threads_per_core : 1 cpu_mhz : 2400 hw_caps : bfebfbff:20100800:00000000:00000940:0000e3bd:00000000:00000001 total_memory : 4095 free_memory : 383 node_to_cpu : node0:0-3 xen_major : 3 xen_minor : 1 xen_extra : .2-238.9.1.el5 xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : unavailable cc_compiler : gcc version 4.1.2 20080704 (Red Hat 4.1.2-50) cc_compile_by : mockbuild cc_compile_domain : centos.org cc_compile_date : Tue Apr 12 18:01:03 EDT 2011 xend_config_format : 2 And on server 2 it is this: host : server2 release : 2.6.18-238.5.1.el5xen version : #1 SMP Fri Apr 1 19:35:13 EDT 2011 machine : x86_64 nr_cpus : 4 nr_nodes : 1 sockets_per_node : 1 cores_per_socket : 4 threads_per_core : 1 cpu_mhz : 2400 hw_caps : bfebfbff:20100800:00000000:00000940:0000e3bd:00000000:00000001 total_memory : 4095 free_memory : 383 node_to_cpu : node0:0-3 xen_major : 3 xen_minor : 1 xen_extra : .2-238.5.1.el5 xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : unavailable cc_compiler : gcc version 4.1.2 20080704 (Red Hat 4.1.2-50) cc_compile_by : mockbuild cc_compile_domain : centos.org cc_compile_date : Fri Apr 1 18:30:53 EDT 2011 xend_config_format : 2 -- Met vriendelijke groet / With kind regards, Hans Vos

3 10

[OT] ups advice
by admin lewis 15 Apr '11

15 Apr '11

Hi I have a Dell PowerEdge T310 *tower* server.. I have to buy an ups by apc... anyone could help me giving an hint ? a simple "smart ups 1000" could be enough ? thx so much!! lewis.

12 22

php53 and MSSQL
by John Beranek 15 Apr '11

15 Apr '11

[Reposted now I've joined the list, so I hopefully don't get moderated out] Hi, I've upgraded lots of machines to 5.6 (thanks!) and there was one particular machine that I'd also like to upgrade to PHP 5.3. Unfortunately it seems I can't. On the machine I have php-mssql installed, and it appears that there is no php53-mssql. php-mssql is built from the php-extras SRPM, so is there going to be a php53-extras SRPM? I've checked upstream, and they also don't have a php53-mssql package, so if there _were_ to be solved it'd have to be in the 'Extras' repository I guess... Cheers, John. -- John Beranek To generalise is to be an idiot. http://redux.org.uk/ -- William Blake

2 3

php53 and mcrypt
by Geoff Galitz 15 Apr '11

15 Apr '11

More PHP fun! I can see in the spec files that php-mcrypt support was removed by Redhat. I tried to find out why but I don't have sufficient access to redhat bugzilla. I am wondering if it is actually necessary as I have also run across a post or two that indicates applications that rely on mcrypt still work with the new php53. Perhaps mcrypt was superceded by another module or PHP core code?

3 2

php53 and eacclerator
by Geoff Galitz 15 Apr '11

15 Apr '11

Hi. There does not seem to be a php53-eaccelerator in standard Centos yum channels, from what I can see. That is a mainstay for us. Has anyone found that any particular php53-eacclerator from other locations play well with it? Thanks.

5 6

Expanding RAID 10 array, WAS: 40TB File System Recommendations
by Emmanuel Noobadmin 15 Apr '11

15 Apr '11

On 4/13/11, Rudi Ahlers <Rudi(a)softdux.com> wrote: >> to expand the array :) > > I haven't had problems doing it this way yet. I finally figured out my mistake creating the raid devices and got a working RAID 0 on two RAID 1 arrays. But I wasn't able to add another RAID 1 component to the array with the error mdadm: add new device failed for /dev/md/mdr1_3 as 2: Invalid argument Googling up this indicates that it's the expected result trying to add a new device to a RAID 0 array. Could you or anybody else please share what's the trick to achieving this?

7 17

CentOS on SSDs...
by John Doe 15 Apr '11

15 Apr '11

Hi, I was just wondering if there are specific steps to take to install CentOS on SSDs... By example, no swap partition? Format with a flash fs? Sysctl parameters? Thx, JD

5 5

speed-tuning samba?
by Les Mikesell 15 Apr '11

15 Apr '11

What's the current state of the art with this black magic? It looks like there are a vast number of tuning options and the ones that typically show up in advice are: socket options = TCP_NODELAY IPTOS_LOWDELAY read raw = yes write raw = yes oplocks = yes max xmit = 65535 dead time = 15 getwd cache = yes some of which may be the defaults anyway. One thing in particular that I'd like to make faster is access to a set of libraries (boost, etc.) that are in a directory mapped by several windows boxes (mostly VM's on different machines)used as build servers. -- Les Mikesell lesmikesell(a)gmail.com

2 1

Xorg
by Michel Donais 15 Apr '11

15 Apr '11

For a few days I can't boot a server in graphical mode. The screen goes black and a have a CUI login. I can login a user and at this point 'startx' get the graphical interface up in /etc/inittab/ x: 5:respawn: /etc.X11/prefdm -nodaemon and xdmcp is alivre On this server we have 12 stations drived by LTSP as a terminal server. We can boot the stations to a point where the X graphical interface doesn't come up and the terminal stays with a grey screen with a big X in the center. Do somebody can drive me to a solution? --- Michel Donais

1 0

Re: [CentOS] 40TB File System Recommendations
by John Jasen 14 Apr '11

14 Apr '11

One was 32 bit, the other 64 bit. Christopher Chan <christopher.chan(a)bradbury.edu.hk> wrote: >On Thursday, April 14, 2011 07:26 AM, John Jasen wrote: >> On 04/12/2011 08:19 PM, Christopher Chan wrote: >>> On Tuesday, April 12, 2011 10:36 PM, John Jasen wrote: >>>> On 04/12/2011 10:21 AM, Boris Epstein wrote: >>>>> On Tue, Apr 12, 2011 at 3:36 AM, Alain Péan >>>>> <alain.pean(a)lpp.polytechnique.fr >>>>> <mailto:alain.pean@lpp.polytechnique.fr>> wrote: >>>> >>>> <snipped: two recommendations for XFS> >>>> >>>> I would chime in with a dis-commendation for XFS. At my previous >>>> employer, two cases involving XFS resulted in irrecoverable data >>>> corruption. These were on RAID systems running from 4 to 20 TB. >>>> >>>> >>> >>> What were those circumstances? Crash? Power outage? What are the >>> components of the RAID systems? >> >> One was a hardware raid over fibre channel, which silently corrupted >> itself. System checked out fine, raid array checked out fine, xfs was >> replaced with ext3, and the system ran without issue. >> >> Second was multiple hardware arrays over linux md raid0, also over fibre >> channel. This was not so silent corruption, as in xfs would detect it >> and lock the filesystem into read-only before it, pardon the pun, truly >> fscked itself. Happened two or three times, before we gave up, split up >> the raid, and went ext3, Again, no issues. > >32-bit kernel by any chance? >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos

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Discuss April 2011