[dm-devel] memory consumption of multipathd after Upgrade SLES 10 SP2 -> SLES 11

[Sebastian Reitenbach]

Hi,

On Monday 19 October 2009 09:04:11 am Sebastian Reitenbach wrote:
> Hi,
>
> On Monday 19 October 2009 08:16:51 am Hannes Reinecke wrote:
> > 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.
>
> I thought I have all available updates installed, need to check, refresh my
> update sources, and see again whether updates are available.

Not perfectly sure what you mean with latest maintenance release. However, I 
just synched again the SLES 11 updates from:
https://nu.novell.com/repo/\$RCE/SLES11-Updates/sle-11-x86_64/
however, no new multipath-tools or kernel update is available. 
Do you know which version is supposed to work?

regards
Sebastian