[linux-lvm] How do I tell what disk a volume group reside on

Vickie Troy-McKoy vtmckoy at hotmail.com
Wed Apr 14 12:34:52 UTC 2010



For the device in question, I did: "fdisk -l /dev/md10".  I received the following output:


Disk /dev/md10: 73.2 GB, 73270689792 bytes
2 heads, 4 sectors/track, 17888352 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md10 doesn't contain a valid partition table


However, when I list out /dev/mpath, I get the following:


 ls -lrt
total 0
lrwxrwxrwx  1 root root 7 Mar 26 07:28 mpath3 -> ../dm-8
lrwxrwxrwx  1 root root 8 Mar 26 07:28 mpath3p1 -> ../dm-10
lrwxrwxrwx  1 root root 7 Mar 26 07:28 mpath2p1 -> ../dm-9
lrwxrwxrwx  1 root root 7 Mar 26 07:28 mpath2 -> ../dm-7


How do I interpret this output?  Does it mean the absence of "md10" means that it resides on the internal drive.  I know that /dev/dm-9 and /dev/dm-10 reside on the SAN.  But, I guess I was looking for a more concrete way to tie /dev/md10 to the attached devices in /proc/scsi/scsi so that I can definitely say it's on the FUJITSU drive or on the SUN StorEdge 3510.


Thank you,


From: linuxmails.lists at gmail.com
To: linux-lvm at redhat.com
Date: Wed, 14 Apr 2010 00:36:37 -0500
Subject: Re: [linux-lvm] How do I tell what disk a volume group reside on


Assuming that you are using MPIO , have you compared the output of fdisk -l to the dm device names in /dev/mpath? 


On Tue, 13 Apr 2010 20:59:40 -0400
Vickie Troy-McKoy <vtmckoy at hotmail.com> wrote:

Hi All,

I have a RedHat4 server connected to a SAN 3510 Array.  On the host

server, there are two volume groups set up--root_vg and san_vg.  I'm

assuming that root_vg resides on the internal disks and san_vg on the

SAN.  But, how can I check to make sure this is the case?

Thank you,

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