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MSL6030 LTO Ultrium II tape copy performance

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CARLOS SOUSA
Occasional Advisor

MSL6030 LTO Ultrium II tape copy performance

We want to use a MSL6030L2 2 drives Ultrium II tape library to copy tapes. What are the expected performance to copy a LTO II tape (400GB) using Data Protector 5 ?
4 REPLIES
Leif Halvarsson_2
Honored Contributor
Solution

Re: MSL6030 LTO Ultrium II tape copy performance

Hi,

If 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.
Leif Halvarsson_2
Honored Contributor

Re: MSL6030 LTO Ultrium II tape copy performance

Hi,

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.

Dragan Krnic_3
Occasional Advisor

Re: MSL6030 LTO Ultrium II tape copy performance

Data Protector is probably not the right
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.
CARLOS SOUSA
Occasional Advisor

Re: MSL6030 LTO Ultrium II tape copy performance

Hi,
Many thanks for your reply. Any clue for W2K environments ?