swap mirrored disks using ServiceGuard

[Roman_11]

We currently have a cluster sharing a mirrored set of disks. I need to replace the 18gb disks with 36gb drives. These disk are part of a external JBOD and the root filesystems are not affected. Could someone please provide the necessary steps to do this.

[A. Clay Stephenson]

Hi:

You are not going to like my answer but I assume that you wish to take advantage of the extra size of your disks. When a volume group is created, the maximum number of PE's and the PE size is fixed. If you attempt to add these disks to your existing volume group, you will be limited to the largest surrent disk - 18GB.

You are going to have to start from scratch and backup your existing filesystems; vgexport your existing VG from all SG nodes; then create a volume group; make lvols and filesystems, and then restore the data from backup. You will then need to vgimport to the remaining nodes.

[Jeff Schussele]

Roman,

Check this thread from last week - same request, same basic responses:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xaed094f22a31d6118fff0090279cd0f9,00.html

You'll have to recreate the VGs to get full capacity from the new drives.

Rgds,
Jeff