Re: DLT 7000 Performance
1997-05-19 11:35:40
>What other server parameters have you set up? I am transferring my data
>from non collocated to the collocated tapes and the transfer rate is
>extremely poor for 6 DLT 4000 drives in the STK 9710 library. It has been
>over 24 hours and only 843,388,247 bytes of data has been transferred
>though MOVESIZETHRESH is set to 1000 and MOVEBATCHSIZE is set to 40.
Transferring data from a non-collocated tape to a collocated tape can
be very slow because the server makes multiple passes through the database
and the source volume. This allows files to be transferred by node/filespace
without requiring excessive tape mounts of the target media.
You should be able to achieve much better performance by using Move Data
to transfer files from the non-collocated tape to a disk storage pool
and then allowing the files to migrate from disk to the collocated tape
storage pool.
Dave Cannon
ADSM Server Development
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