Re: memory consumption of multipathd after Upgrade SLES 10 SP2 -> SLES 11

[Hannes Reinecke <hare@suse.de>]

Sebastian Reitenbach wrote:
> Hi,
> 
> I use multipath tools to manage the multiple ways through the SAN connected 
> via FC. The server sees two paths per LUN. There are 15 LUNs presented to the 
> server.
> 
> I upgraded two server to SLES 11, installed latest patches, running kernel:
> Linux server1 2.6.27.29-0.1-xen #1 SMP 2009-08-15 17:53:59 +0200 x86_64 x86_64 
> x86_64 GNU/Linux
> 
> multipath-tools-0.4.8-40.4.1
> 
> There I recognized a fairly large amount of memory used by multipathd:
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>  5367 root      RT   0  238m 140m 2804 S    0 28.1   0:34.70 multipathd
> 
> I see the huge memory consumption on both of the servers. 
> 
> 
> On a different server, not yet upgraded, running SLES 10 SP2, with different 
> SAN storages applied, there I run kernel:
> Linux server2 2.6.16.60-0.34-xen #1 SMP Fri Jan 16 14:59:01 UTC 2009 x86_64 
> x86_64 x86_64 GNU/Linux
> with multipath tools:
> multipath-tools-0.4.7-34.40
> There I have 20 LUNs presented, and the server sees 4 paths per LUN, I in top 
> a much fewer memory consumption:
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>  4796 root      RT   0 11928 4808 2220 S    0  1.6   0:01.37 multipathd
> 
> 
> However, both of the servers running SLES 11 work fine so far, no "errors" 
> recognized. I still wonder whether the large memory consumption is correct, as 
> I expected sth. similar as on the SLES10 SP2 hosts. 
> Below the configuration file I use on the SLES 11 servers.
> 
This is a known regression with SLES11. Please update to the latest
maintenance release.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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