Is the bottleneck something else?   We initially got poor performance
on migration, but the problem was the updates to the ADSM database.
We put the ADSM database behind a cached SSA adapter and our migration
throughput went from <1MB/sec to about 5-7MB/sec.

--
Gene Mangum
Gene Mangum
University of Michigan Medical Center


On Sat, 5 Jun 1999, Mark Rinfret wrote:

> I'm in the process of configuring and testing ADSM and a 3590 tape drive
> with autochanger on an RS/6000 S7A system. The tape drive is connected to a
> SCSI F/W adapter. The server and client are both on the same machine and I'm
> using the SHAREDMEM communication method. I've also set the buffer sizes and
> vmtune parameters recommended by the performance guide. However, when I run
> a test archive (a half-dozen filesystems totalling around 2.5 GB), I see an
> aggregate throughput rate of about 2 MB / second and I hear lots of
> start/stop activity on the drive. I expected much better performance than
> this.
>
> I'd appreciate hearing from others who have a similar configuration and who
> might have suggestions on tuning this as well as real data on the throughput
> rates I should expect.
>
> Thanks,
>
>         Mark Rinfret
>