[dm-devel] Unable to use multipath with LVM2
Magni Fabrizio
Fabrizio.Magni at rasnet.it
Tue May 3 12:49:03 UTC 2005
Hi Lars,
> It'd be helpful if you actually reported which distribution you're
> talking about ;-)
>
luckily you know my situation.
> But looking at your version, I guess you might be running SLES9. In
> which case SP2 should help address your troubles:
> http://portal.suse.com/sdb/en/2005/04/sles_multipathing.html
>
> Please try and get access to the beta via your support contact.
>
I'm going to try soon.
> > If I insert aliases in multipath.conf and modify udev.rules
> I can see
> > symbolick links wichi can be used in failover or multibus
> (tested) but
> > they are not seen by the LVM2 (even modifying the filter in
> lvm.conf and
> > specifying "types").
>
> With those changes LVM2 is supposed to recognize them. Not sure why it
> doesn't for you.
>
> > What devices should the LVM scan to use multipathed PVs?
>
> Either the /dev/disk/by-*/ files, or /dev/dm-*; either will do. It's
> just important that it only uses those paths and doesn't use the raw
> disks (/dev/sdX).
>
/dev/disk/by-*/ can be scanned but they don't work properly on top of
multipath since they are linked directly to the "basic devices"
/dev/sd*.
I really don't understand why /dev/dm-* cannot be scanned properly by
the LVM2...
Fabrizio
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