The real figure - 32-34 MB/s per LTO drive in IBM 3583 with drive
compression.

The "theoretical" comment - most of the times *source* disks cannot supply
data fast enough to feed more than 1-2 LTO drives. For different locations
the bottleneck is at different place but disk reading is the top one -
very rarely the read rate is over 80-100 MB/s and often is 20-30 MB/s.
Next poor-performer is bad disk layout - data is split for performance but
ends and same disks. The result in both cases is well-known -
"shoe-shining" (write, stop, write, stop, ...)

Zlatko Krastev
IT Consultant






Markus Veit <markus.veit AT BAYERBBS DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
17.01.2003 13:05
Please respond to "ADSM: Dist Stor Manager"


        To:     ADSM-L AT VM.MARIST DOT EDU
        cc:
        Subject:        Statistical data LANFREE


Hi,
has anyone got any statistical info on how many GB/hour a LANFREE setup
can
backup / restore with multiple mount points available to the storageagent.
It would be highly appreciated if you clould give me a short summary of
your
setup, because we use different SAN technologies, such as Compaq, EMC, and
would
like to implement LANFREE backup for these systems. The TSM servers run on
2
different platforms AIX and W2k.
Another question would be if anyone uses a LANFREE backup / restore
solution
where 2 TSM servers are involved each sharing each others Library for
copypool
backup?
Please only real figuers, which are actually observed in real life, no
theoretical numbers.
Thanks for your time.

Best Regards

Markus Veit