From mboxrd@z Thu Jan  1 00:00:00 1970
From: malahal@us.ibm.com
Subject: Re: multipath: Determine which device to use for
 grubdevice.map file
Date: Fri, 19 Feb 2010 16:04:34 -0800
Message-ID: <20100220000434.GA7527@us.ibm.com>
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> mpatha (36006016094511600449d92ae1937d611) dm-0 DGC,DISK
> [size=50G][features=1 queue_if_no_path][hwhandler=1 emc][rw]
> \_ round-robin 0 [prio=2][active]
> \_ 2:0:1:0 sdd 8:48  [active][ready]
> \_ 3:0:1:0 sdf 8:80  [active][ready]
> \_ round-robin 0 [prio=0][enabled]
> \_ 2:0:0:0 sdc 8:32  [active][ready]
> \_ 3:0:0:0 sde 8:64  [active][ready]
>
> Out of the 4 paths, only two (sdd and sdf) are active. This output is 
> not very good to parse through in a script to determine which disks I 
> can specify in my device.map file. Is there a command or better way to 
> determine which underlying paths I can use in my device.map file.

You can probably get it from "dmsetup status <device>", but it may be
even harder to parse!

Thanks, Malahal.