[OpenAFS] Understanding questions backup volume

Lars Schimmer l.schimmer@cgv.tugraz.at
Thu, 09 Feb 2006 11:43:45 +0100

Hash: SHA1


I start using backup volumes ;-)
It is fairly easy to create one and mount them.
But: Where is the difference between RO copies and a backup volume?
I know, backup volumes should be used for backup, RO for distributing
data all over the cell.
A backup should be made of the backup volumes, because this doesn't lock
the RW volumes for a long time.

And if I vos dump the backup volumes to a backup server (amanda-afs or
just plain dump) I could rebuild the backup volumes. Does this help me
in case of a lost RW volume?
At least a RO copy could be converted to a RW volume in nearly NO time,
but a backup volume?

Our cell is designed to have a RO copy of every RW volume.
And if one RO copy of a RW volume resist on a file server housed in a
datacenter "far away" I've got a quick and easy 1-day-backup in case of
big error here. With the ROtoRW convert the cell is back up very fast.
So why use backup volumes?

Are backup volumes built incremental?

Because with only RO copies, I get a 1-day-backup, but I need a
long-term-backup with incremental backups.

Lars Schimmer
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