[Cluster-devel] [PATCH 2/4] mkfs.gfs2: Align resource groups to RAID stripes

[Bob Peterson <rpeterso@redhat.com>]

----- Original Message -----
| It has never been valid to assume that all the rgrps are the same size.

Well, as I said: due to gfs2_convert, we can't enforce it. However,
gfs2_grow and fsck.gfs2 were originally designed under that assumption.
Today's gfs2_grow may still be assuming it, which might be wrong, and
perhaps should be investigated. (It's been too long since I've looked at it.)
My concern here is that gfs2_grow operates properly on a gfs2_converted
file system from gfs1 with non-uniform rgrps, especially if the Nth rgrp
and N-1th rgrp are different sizes; could damage result? Worth checking.

|  - Would it be useful to introduce a flag to show the source of an rgrp
| (whether mkfs or gfs2_grow) ?

Yes, good idea.

|  - Would it be useful to add a creation date stamp to each rgrp so that
| we can see when things have happened in the past?

Another good idea.

Bob