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:[EMAIL PROTECTED] On Behalf Of TSM User Sent: Thursday, June 05, 2008 9:35 AM To: ADSM-L@VM.MARIST.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 CONFIDENTIALITY NOTICE: This email and any attachments are for the exclusive and confidential use of the intended recipient. If you are not the intended recipient, please do not read, distribute or take action in reliance upon this message. If you have received this in error, please notify us immediately by return email and promptly delete this message and its attachments from your computer system. We do not waive attorney-client or work product privilege by the transmission of this message.