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тАО04-01-2004 11:37 PM
тАО04-01-2004 11:37 PM
Slow Restore from an Ultrium Tape
What could be responsible for this?
One observation is a directory with 21000 files took about 10 hours in the course of the restore.
Any help will be appreciated.
Thanks.
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тАО04-01-2004 11:41 PM
тАО04-01-2004 11:41 PM
Re: Slow Restore from an Ultrium Tape
Are you using fbackup ? you didnt say which backup tool you are using. If it is fbackup there are some configuration options you can set to make restores faster (more checkpoints etc.). Here is the one we use which is a nice balance between backup speed and decent recovery speed;
blocksperrecord 128
records 32
checkpointfreq 256
readerprocesses 4
maxretries 1
retrylimit 0
maxvoluses 1000
(/var/adm/fbackupfiles/config)
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тАО04-01-2004 11:45 PM
тАО04-01-2004 11:45 PM
Re: Slow Restore from an Ultrium Tape
check this doc,
http://www.hp.com/products1/storage/products/tapebackup/ultrium_tapedrives/ultrium230/infolibrary/whitepapers/ultperfpress.pdf
I don/t know if you are using parallelism for faster backups, disadvantage can be that the restore is slow.
Hope this helps,
Robert-Jan
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тАО04-01-2004 11:48 PM
тАО04-01-2004 11:48 PM
Re: Slow Restore from an Ultrium Tape
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=45872
We would not use fbackup for full server backup. For that, we use OBII/DP and there is not much differences between backup time and restore time.
Regards,
Jean-Luc
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тАО04-02-2004 12:07 AM
тАО04-02-2004 12:07 AM
Re: Slow Restore from an Ultrium Tape
- Creation of files takes time. Especially on vxfs filesystems. So if you have lots of small files, they are slow to recover
- having verbosely output what you restore to a slow terminal session, for instance a 9600 baud console, can slow down a restore really good ;-(
These two are reasons I've seen, next to the other reasons the others gave, for slow restores.