>timex dd if=/dev/zero of=/dev/rmt1 bs=1024 count=1000 > >The result was real 21.06 seconds. This falls way short of what I would >expect when the advertised sustained transfer rate is supposed to be >15MB/sec native (30MB/sec compressed). ... 1K seems like a very small block size. Did you try other block sizes to see if that made any difference in speed? I think I remember some discussion quite some time ago about what blocksize TSM used - the AIX setting for the tape device or some other value - I think the answer was that it used a 64K blocksize.
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