Hi Steve.
Our 2 level tape strategy is within the same silo, but we are using both
STK 9840 and Timberline drives.
We have only recently got the the 9840s and are using them for our large Netware
Data Servers. We are seeing a range of capacity on the 9840s from about 23 gb.
to about 33gb. This is still about 20 times better than we wre getting before.
Have only been using move data between the two types of tapes, because I have
been
moving to a different policy domain but you could use migration if you were
within the same domain.
We get ADSM to choose the desired tape devices via specifying the required
destination in the backup copy groups and we control the tape usage within our
tape management system using device class to assign a different data set name
prefix.
Have not seen any major problems so far.
John
Steve Harris <steveh AT WESLEY.COM DOT AU> on 02/12/99 05:32:48
Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
cc: (bcc: John Naylor/HAV/SSE)
Subject: Two Level Tape Hierachies
Hi all.
Regular readers will know that I'm looking at strategies for increasing capacity
of my 3575-l06 library. I'm reasonably sure that I don't want to go down the
road of having active tapes racked outside the library because of the amount of
manual intervention that would be required (I'll happily listen to anyone who is
doing this successfully!). One alternative that occurred to me is that I could
have a second library of higher capacity/lower performance tapes and use ADSM to
migrate data automatically from one tapepool to the other as required, and for
copypool tapes.
This has the advantage of reducing the amount of tape swapping in the 3575,
thereby allowing the 14 Bulk IO slots to be configured as storage (a 23%
improvement less pending tapes), and if the new library is DLT it will allow the
reuse of the DLT media that we are currently using in stand-alone drives. We
might also be able to get an old Stotek DLT silo second hand...
Is anyone using a multi-level tape pool scheme? Any war stories, gotchas or
pitfalls?
Thanks
Steve Harris
AIX/ADSM/Oracle/HACMP Guy
The Wesley Hospital, Brisbane Australia
...
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