[dm-devel] memory consumption of multipathd after Upgrade SLES 10 SP2 -> SLES 11
Hannes Reinecke
hare at suse.de
Mon Oct 19 06:16:51 UTC 2009
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 at suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
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