We do regular backup/restore verifications.  We also restore live data to
test from tapes as required.  I haven't run into any issues on restoration.

Paul

-----Original Message-----
From: Darren Dunham [mailto:ddunham AT TAOS DOT COM]
Sent: Wednesday, April 14, 2004 12:36 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] volume capacity part 2


>
> On my LTO2 tapes I am getting anything from 160GB to over680GB per tape.
> The backups that are primarily unix are getting the highest compression.
> Compression is done on the drives, not at the server/client level.

Do you verify those volumes periodically?

In the past (probably 5.5) I had some issues with very high compression
tapes appearing (DLT 7000s with over 150GB reported), and it turned out
that the tapes had become corrupted, with some data being overwritten.
Networker never told me about it, but if you checked the volume with
scanner, it would complain that the first file on the tape was file #62
(as an example).  I never was able to determine if it was a problem with
Networker, the OS tape drivers, or the tape drives themselves.

Ever since I've run periodic scans on my very high compression tapes
just to make certain things haven't gone south.

--
Darren Dunham                                           ddunham AT taos DOT com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
         < This line left intentionally blank to confuse you. >

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