We've isolated the issue to the client side. We were able to restore the
directory to a different system with zero issues. We suspect it has
something to do with their filesystem layout on the client... But since they
don't give us lowly backup people accounts on their systems we can't
confirm.

Thanks everyone for the great input on this one.

Kevin Denton

-----Original Message-----
From: william.d.brown AT GSK DOT COM [mailto:william.d.brown AT GSK DOT COM] 
Sent: Thursday, October 28, 2004 8:33 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] How to troubleshoot slow restore


Maybe the chunk size you are writing to tapes.   Keep that to 2GB on the 
storage unit.  Otherwise I guess you can have very long sections written 
by one of the multiplexing clients.   Is the delay (a) before any data 
comes off the tape (b) after you reckon it is all off, keeps looking down 
the tape for more or (c) just low data rate off the tape?

Maybe a bad tape, with lots of soft errors.
Maybe a DLT tape that has lost the directory at the BOT, so cannot fast 
position.  Can't recall just how you fix it, but the symptom is a tape 
that takes forever to position to the start of the data, i.e. may take 40 
minutes to  get the first block off the tape, instead of the usual 2-5 
minutes or less.

You did not say if this was a particular restore of one tape or if all 
your restores just went over a performance cliff.

William D L Brown
Ext Tel: +44 1438 762681 Fax +44 1438 762336 Mobile: +44 7717 800241

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