> Has anybody out there gone from 3 years of nocollocation and then >changed to collocation for better restores. We are currently at 2-3+ TB of >info on 540 tapes (this is all in our 1 TAPEPOOL). We have about 410 >scratch tapes and the uppers are worried about making the global switch to >collocate will cause TSM to crash due to no scratch tapes.
Bill, I made this move last year myself. The main thing I had to consider was how many scratch tapes I had, and extra library slots available, compared to the number of nodes that were now going to now grab tapes. I don't know the inner working of TSM related but I can say I planned for the worst. I may have had any number of tapes in filling status but I went on the assumption that none were going to be used once co-location was turned on. For me that meant 180 tapes off the top. I also assumed that over time reclamation would clean things up and free up tapes, which it did. For us that was ok because I also had around 400 blank tapes to work from. Something I've had to keep an eye out for since then though is tapes going unavailable/read-only. If that happens then the affected node will automatically grab a new tape. In cases like that I always move the data to free up that extra tape. The bottom line is it went off without a hitch. Geoff Gill TSM Administrator NT Systems Support Engineer SAIC E-Mail: [EMAIL PROTECTED] Phone: (858) 826-4062 Pager: (877) 905-7154
