SCIENTIFIC-LINUX-USERS Archives

February 2010

SCIENTIFIC-LINUX-USERS@LISTSERV.FNAL.GOV
Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
Re: kernel stack size problems with xfs & NFS4 for i386 arch.
From:
Thomas Kress <[log in to unmask]>
Reply To:
Thomas Kress <[log in to unmask]>
Date:
Wed, 10 Feb 2010 15:02:00 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (59 lines) 
Hi Matthias (and Brent),

thanks for the reply.

We have upgraded some of our 5y old P4 disk servers with 16 disks with 1 TB each. The one P4 CPU (plus reasonable network, Raid controllers, RAM, ...) is still ok for NFS but requires 32 bit.

       Cheers, Th.


Am 10.02.2010 um 14:52 schrieb Matthias Schroeder:

> Thomas Kress wrote:
>> Hello All,
>> at RWTH Aachen, Germany, we are experiencing frequent kernel
>> freezings of our (a bit older) data servers when using (SL5,) the xfs
>> file system and NFS4 with i386 data server architectures. No problems
>> with 64 bit servers.
> 
> You are aware that xfs is not really supported on 32 bit systems?
> 
>> From the /var/log messages we think that the problem is due to a
>> smaller stack size for the i386 kernel as described here: http://www.mythtv.org/pipermail/mythtv-users/2005-May/089314.html
>> Any chance that for future SL kernel upgrades 8k instead of 4k stack
>> size is used also for the 32 bit architecture (kernel parameter
>> CONFIG_4KSTACKS=n)
> 
> Epsilon, I would say.
> 
>> or any idea how to cure the problem ?
> 
> Go to 64 bit.
> 
>> In our
>> opinion ext3 is not a very good choice for big data servers in case
>> of fs crashes.
> 
> Why insist on a 32 bit system for 'a big data server'???
> 
> Matthias
> 
>> I found this issue discussed already in Jan 2006 on this list but I
>> wonder whether there was any progress during the last four years.
>> Thanks & cheers, Thomas.
>> -- Mit besten Gruessen/With kind regards,
>> Thomas Kress, RWTH Aachen, III. Physikalisches Institut, Lehrstuhl B Office Aachen:  28A 206, Phone: +49 241 80 27281, Fax: ... 22244 Office CERN: B40 4-A16, Phone: +41 22 76 71682,   Fax: ... 78940 Email:
>> [log in to unmask]<mailto:[log in to unmask]>
>> ; [log in to unmask]<mailto:[log in to unmask]> Signed with a
>> certificate issued by GridKa-CA (GermanGrid)
> 

--
              Mit besten Gruessen/With kind regards,

Thomas Kress, RWTH Aachen, III. Physikalisches Institut, Lehrstuhl B
Office Aachen:  28A 206, Phone: +49 241 80 27281, Fax: ... 22244
Office CERN: B40 4-A16, Phone: +41 22 76 71682,   Fax: ... 78940
Email: [log in to unmask] ; [log in to unmask]
            Signed with a certificate issued by GridKa-CA (GermanGrid)

ATOM RSS1 RSS2