Bug#580972: multipath-tools: unnecessary call to multipath in /etc/udev/rules.d/z60_multipath.rules

[Guido Günther]

Hi Ritesh,
On Mon, May 02, 2011 at 04:09:19AM +0530, Ritesh Raj Sarraf wrote:
> On 05/01/2011 11:33 PM, Faidon Liambotis wrote:
> > Ping? From experience, this is quite a serious issue on large multipath
> > setups, the problem being in a Debian-specific modification that can
> > easily be fixed.
> HI,
> 
> I've recently taken up multipath maintenance from Guido.
> 
> I totally agree with the large number of LUNs rescan issue. It will
> bring your machine down immediately.
> 
> What I'd like you to confirm is is if this issue is seen on squeeze/sid?
> The bug report is against the  version in lenny where I'm not sure what
> adverse effects this change could bring. Workaround for lenny could be
> to simply comment that rule.

Please see the comment in 4f8a5d1dff1dc4590f83395a31c3eb997a4cca57. It
was added to make sure we discover slow devices in the initramfs. It
might make sense to either use this rule as part of the initramfs only
or to check if multipathd is running before running /sbin/multipath
within in the rule.
Cheers,
 -- Guido

> 
> If you see this problem with sid, please confirm on this bug report. I'd
> like to fix this. Meanwhile I'll see if I can reproduce this issue in my
> sid setup.
> 
> 
> Ritesh
> 
> -- 
> Ritesh Raj Sarraf | Linux SAN Engineering | NetApp Inc.
> 
>