You have two options:
Partition the library, with LTO1 drives and media as one logical library and
LTO4 drives and media as the second. If you have ALMS, you can over-commit
slots in both libraries. If not, I'd check out as many LTO1 as possible before
partitioning and swap tapes as you migrate off the old ones.
Or - mark all LTO1 tapes read-only and check them out as you move the data off
of them. This will still be problematic, as TSM *may* shove an LTO1 tape into
an LTO4 drive in this case. This is because TSM is managing the tapes and
drives at the device class level, and you'll only have one device class in the
library. If this does happen, the tape will most likely get marked
'unavailable' because it could not be read.
Tom Kauffman
NIBCO, Inc
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
TSM User
Sent: Thursday, June 05, 2008 9:35 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: LTO1 to LTO4 migration question
I'm trying to find the best way to migrate a 3584 library from LTO1 to LTO4
media. For a period of time, both drive types will be installed. I know
the library can be partitioned, but capacity is already pretty tight, and it
would almost certainly require continuous "redrawing the borders" as the
relative proportion of media types shifted, in order to make everything
fit. Would there be any gotchas if I defined both device classes to the
same library, and then assigned the LTO4 scratch media to the appropriate
storage pools immediately on checkin? Or am I required to do some kind of
library partitioning to make this work? I've done some searching online,
but can't find anything explicit one way or the other.
Thanks,
Kathy
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