Darth Keller wrote:
Bruce Black wrote:
If you have to recover one or a few datasets from a backup, restore
from
a -27 can take longer than from a -3. Can be an issue when some
over-excited application manager is watching over your shoulder.
I dare to disagree. Restore from backup does not depend on volume size.
It depends on dataset size, tape technology, >backup application and many
other things, but why volume size ?
BTW: I'm using HSM, maybe this is the point.
--
Radoslaw Skorupka
IIRC, we were talking about full-volume DR type backups here. If you have
to spin the backup to the end to find the dataset you're looking for, I
would think it would affect the recovery time if the volume were a mod-27
as opposed to a mod-3.
dd keller
OK, I now I understand. However IMHO this time increase is simply irrelevant.
DR (full volume) backups are for DR (full volume) restores. Time to restore mod-27 is longer than time to restore mod-3, but time to restore 2TB in mod-3's should be comparable or *longer* than time to restore 2TB of data on mod-27's.
BTW: Regardless of volume size, RTO and RPO are very poor when restoring from
tape. Possibly, time to start the process is as long as time of recovery.
--
Radoslaw Skorupka
Lodz, Poland
--
BRE Bank SA
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