Re: [Networker] Restore questions
2005-06-23 00:29:10
Werth, Dave wrote:
The restore of E:\ took about 11 hours. The restore of F:\ took about 8.5
hours (including restoring the 2 incrementals that followed it). Since the
two drives are of similar size (F being 3.6% larger) that is a substantial
difference.
Right here is the potential trap with saveset recoveries. Suppose you
have the following situation:
Day 1: Full back up drive E:\
Later that day after the full backup:
.. Existing FileA deleted
.. New FileB added
.. Existing FileC modified
Day 2: Incremental backup of drive E:\
Now let's say on Day 3 you have to restore the entire drive E:\. When
you restore the saveset from Day 1 you're going to get FileA, FileB, and
FileC. When you restore the saveset from Day 2 you're going to get the
updated version of FileC.
What you're left with is FileA which shouldn't be there after Day 2
anyway. In other words, when restoring using multiple savesets depending
on your backup strategy it is possible to end up with extra files that
were deleted.
As far as index scanning goes, savesets are faster because the up front
time to calculate what files need restoring isn't done however with an
index based recovery you eliminate the problems of extra files showing
up. As far as I've seen the index scanning only takes place PRIOR to the
file copies off the tape to the disk. Once the files start moving off
the tapes the index based recovery doesn't appear any slower or faster
than a saveset recovery.
All based on observation and experience. I should really read the
manuals some day. ;)
--
Scott Russell <lnxgeek AT us.ibm DOT com>
IBM Linux Technology Center System Admin
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