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Date: Thu, 19 Mar 2009 13:00:25 -0600
From: vu pham <vu@sivell.com>
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Subject: [linux-lvm] multipath question
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I set up multipath on /dev/sda and /dev/sdb which are mapped from a 
remote single disk, which has two partitions.

Below are some output.
[root@vm5 mpath]# ls -l
total 0
lrwxrwxrwx 1 root root 7 Mar 19 10:34 mpath0 -> ../dm-2
lrwxrwxrwx 1 root root 7 Mar 19 10:34 mpath0p1 -> ../dm-3
lrwxrwxrwx 1 root root 7 Mar 19 10:34 mpath0p2 -> ../dm-4

[root@vm5 mpath]# multipath -ll
mpath0 (16465616462656166313a3100000000000000000000000000) dm-2 
IET,VIRTUAL-DISK
[size=5.0G][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][active]
  \_ 0:0:0:1 sda 8:0   [active][ready]
\_ round-robin 0 [prio=0][enabled]
  \_ 1:0:0:1 sdb 8:16  [active][ready]
[root@vm5 mpath]#


 From the multipath command, I know dm-2 is mapped from two devices 
/dev/sda and /dev/sdb as expected.

But how can I know if dm-3 is mapped from /dev/sda1 and /dev/sdb1, and 
dm-4 from /dev/sda2 and /dev/sdb2 ?

The command "multipath -ll" only gives info on mpath0 or dm-2.

I tried  multipath -ll /dev/mpath/mpath0p1 but does not show anything.

Thanks,

Vu