Re: [Networker] Restore questions

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 youhave 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:\. Whenyou restore the saveset from Day 1 you're going to get FileA, FileB, andFileC. When you restore the saveset from Day 2 you're going to get theupdated version of FileC.

What you're left with is FileA which shouldn't be there after Day 2anyway. In other words, when restoring using multiple savesets dependingon your backup strategy it is possible to end up with extra files thatwere deleted.

As far as index scanning goes, savesets are faster because the up fronttime to calculate what files need restoring isn't done however with anindex based recovery you eliminate the problems of extra files showingup. As far as I've seen the index scanning only takes place PRIOR to thefile copies off the tape to the disk. Once the files start moving offthe tapes the index based recovery doesn't appear any slower or fasterthan a saveset recovery.

All based on observation and experience. I should really read themanuals some day. ;)


--
Scott Russell <lnxgeek AT us.ibm DOT com>
IBM Linux Technology Center System Admin

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