Ron and Jenny Hawkins wrote:
Radoslaw,
The real bottleneck would be your source media
speed. It will be DASD, won't it ? DASD is much SLOWER then tape, when
considering sustained sequential I/O's.
This has not been true for a long time. Pre-fetching concurrently of 4 or 8
drives is much faster than a single tape drive can handle. There would have
to be some serious backend contention problems for tape to be faster than
multiple disks.
Ron,
That's contrary to my experience. Maybe in laboratory conditions, the
fastest DASD box, without any other workload could work faster, but I
never observed it in real world.
Jaguars are really fast. Typically for tapes, it can be observed on long
runs. "Sprint" is still DASD domain.
--
Radoslaw Skorupka
Lodz, Poland
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