[Lustre-discuss] client I/O

[Ben Evans]

Will the fix be back-ported into 1.6?

--
Ben Evans  ben at terascala.com
Principal Engineer
Terascala Inc.
Office:  508-588-1501 x223
www.terascala.com

-----Original Message-----
From: lustre-discuss-bounces at lists.lustre.org
[mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Andreas
Dilger
Sent: Thursday, January 07, 2010 6:10 PM
To: Michael Robbert
Cc: lustre-discuss at lists.lustre.org; Mag Gam
Subject: Re: [Lustre-discuss] client I/O

On 2010-01-07, at 13:32, Michael Robbert wrote:
> People may want to be a little careful when trying to utilize the  
> "exports" directory that you mention. I just tried the cat the stats  
> file for a random client on my MDS and it caused a kernel panic. The  
> exact command I used was:
> cat mgs/MGS/exports/172.16.44.30\@o2ib/stats
>
> Could this be a known bug or should I file a bug report on it? We  
> are running Lustre 1.6.7.2 on RedHat 4.5. I didn't get a full kernel  
> dump, but I did get a picture of the screen before I rebooted. The  
> last line of the panic reads:
>
> RIP [<ffffffff8868a07b.] :obdclass:lprocfs_stats_seq_show+0xcb/0x210

This looks like bug 21420, fixed in 1.8.2.


> Mike Robbert
>
> On Dec 4, 2009, at 11:39 PM, Andreas Dilger wrote:
>
>> On 2009-12-04, at 20:18, Mag Gam wrote:
>>> Is it possible to figure out what client is taking up the most I/ 
>>> O? We
>>> have 8 OSS and 200 clients and it seems 5 to 6 clients are taking up
>>> all the bandwidth and I am trying to figure out who it is...
>>
>>
>> In newer versions of Lustre (1.8 definitely, and later 1.6.x) there  
>> is
>> an "exports" directory that contains statistics about each client,
>> including brw_stats.
>>
>> Alternately, you can just enable the RPC statistics and then dump the
>> debug logs after a some seconds and check for the OST_READ(3) and
>> OST_WRITE(4).
>>
>> lctl set_param debug=+rpctrace
>> sleep 20
>> lctl dk /tmp/debug
>> grep "Handled.*:[34]$" /tmp/debug
>>
>> Cheers, Andreas
>> --
>> Andreas Dilger
>> Sr. Staff Engineer, Lustre Group
>> Sun Microsystems of Canada, Inc.
>>
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>
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Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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