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Re: [Networker] Scanner command taking soooooooooooo long
2009-08-10 17:26:19
On 11/08/2009, at 07:08 , Chester Martin wrote:
I'm running the scanner command against 4 800gb compressed volumes to
see if a user's home share was in this particular backup. The scanner
command has been running for 3 hours and just now called for the 2nd
tape.
Is there a way to tell the scanner to pull in information on a
particular folder? I've looked at the scanner man page and nothing
jumps
out as to being the solution.
(FWIW the scanner command will take as long as a full start<->finish
write/read of the media - hence it's usually 2-3 hours per tape for
most tapes).
You can't restrict scanner to sub-saveset ranges, but you can, if the
tape has multiple savesets, restrict the scanning operation to only
those savesets that you are interested in -
e.g.,
scanner -i -N /home /dev/nst0
Also if there's multiple clients on the volume(s) you can restrict to
just those clients that will have the saveset - e.g.,
scanner -i -c client -N /home /dev/nst0
Other than that it's just a case of scanning through the "bare
minimum" of what needs to be rescanned; given that NetWorker's media
database doesn't really work with the notion of "partial" savesets
(they're declared unrecoverable), it's understandable in these
circumstances why scanner doesn't allow you to drill down to lower
levels.
The other option of course if you just want to recover the data no
matter what is to combine scanner and uasm to just pull the data back
as you find it. Obviously this results in not indexing the data, but
if it's a one-off recovery that *may* be acceptable. (My blog covers
this at http://nsrd.wordpress.com/2009/04/22/recovering-with-scanner-and-uasm/)
Not the exact answer you were looking for, but hope it helps.
Cheers,
Preston.
--
Preston de Guise
"Enterprise Systems Backup and Recovery: A Corporate Insurance Policy":
http://www.amazon.com/Enterprise-Systems-Backup-Recovery-Corporate/dp/1420076396
http://www.enterprisesystemsbackup.com
NetWorker blog: http://nsrd.wordpress.com
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