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тАО06-16-2003 03:30 AM
тАО06-16-2003 03:30 AM
Solved! Go to Solution.
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тАО06-16-2003 05:20 AM
тАО06-16-2003 05:20 AM
SolutionIf using DP 5.0 you will not get the same performance with copy as with backup. The copy process works different from backup (don't use shared memory). What performance you will get depends on your enviroment but 3-4 * backup time is perhaps possible.
This will change in DP 5.1 . Media copy is improved and, if there is no other bottlenecks, it should be possible to get the full performance out of the drive.
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тАО06-16-2003 11:48 AM
тАО06-16-2003 11:48 AM
Re: MSL6030 LTO Ultrium II tape copy performance
There is a tecnical document about this:
http://openview.hp.com/sso/ecare/getsupportdoc?docid=OV-EN010374
I should have provided the link in my first reply but could not find it on the fly.
No points for this.
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тАО06-17-2003 05:58 AM
тАО06-17-2003 05:58 AM
Re: MSL6030 LTO Ultrium II tape copy performance
choice for that. You basically need two
processes sharing a sizeable FIFO - one
reads the original and feeds the buffer, the
other empties it and writes to the second
drive. The bigger the buffer, the better the
streaming. Copying between two LTO-2s should
stream easily.
I wrote a utility like that when I had to copy
very many DLT70 cartridges to DAT4 cassettes.
It grew into a helpful tool for buffering,
reblocking and general speed up of network
backups, e.g.:
xt "| rsh hpX 'dump 0f - rdsk'" $TAPE
If you get disappointed with the performance
of DP5, maybe you can try it and see if it
fits your purpose perfectly.
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тАО06-27-2003 01:20 AM
тАО06-27-2003 01:20 AM
Re: MSL6030 LTO Ultrium II tape copy performance
Many thanks for your reply. Any clue for W2K environments ?