On Thu, Feb 28, 2013 at 11:14 PM, Harold Pritchett harold@uga.edu wrote:
I have a system with 4 disk drives, two 512 Gb and two 1 Tb. It look like this:
CentOS release 5.9 (Final)
Disk /dev/sda: 500.1 GB, 500107862016 bytes Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes Disk /dev/sdc: 500.1 GB, 500107862016 bytes Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes =================================================================
... snipped...
One of the 512 Gb drives is failing. What I want to do is to replace the two 512 Gb drives with 3 Tb drives, expand the RAID array on them and then expand the LVM PV contained therein. This much I can do.
Make a backup. You haven't said you did, but I won't go without saying it. You're going to need a backup even _if_ you moving extents between PVs.
I then want to move all of the date from the other PV into this one, and remove the second PV, RAID array, and the two 1 Tb drives, leaving me with two 3 Tb drves, a large RAID array and a single PV containing everything (except the /boot and SWAP partitions.)
What I'm not sure about is how to move the date from the second PV to the first so I can then delete the contents of the drive and physically remove them from the system leaving me with only the two 3 Tb drives.
You add your new PVs to the VG that your existing PVs are in. Then run pvmove [0] to migrate extents from the old PV to the new one. There are a couple of examples at the link I referenced.
[0] http://www.centos.org/docs/5/html/Cluster_Logical_Volume_Manager/online_relo...
Help!
Thanks
Harold
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