Interesting question. I would simply measure tape throughput. A question is, where to get tape throguhput stats. You could scan the activity log for migration and reclamation completed stats, and also look for backup sessions that mounted a tape and grab their accounting stats.
Is anybody from someplace like Quantum or the LTO consortium listening? I wonder if the tape drives many of us use (LTO and SDLT) collect any of this information. In the old days, you could watch and listen to tape drives, and a drive that was shoeshining made a distinctive "wheeee, wheeee, wheeee" sound, whereas one that was effectively streaming made more of a motorized, productive, grrurrurrurr. Now they're imprisoned in libraries and you can't even see the blinking lights anymore, much less listen to them. Hmmm, This gives me an idea - on our ATL/Quantum tape libraries, you can open a door on the back and have access to the back of the tape drives. I should borrow a doctor's stethescope and see if I can hear anything from the back. Roger Deschner University of Illinois at Chicago [EMAIL PROTECTED] On Tue, 17 Apr 2007, Peter Billam wrote: > >> when the client is too slow to keep the tape drive streaming, the tape >> stops and starts - shoeshining. This really wears out your tapes. They >> say that DLT and LTO tapes are good for some huge number of passes in >> the millions, but once you start shoeshining you can reach those numbers >> real quick. >> ... >> The only way to positively prevent shoeshining is to buy more disks, >> and insure that all tape writing is done via TSM Migration from local >> server disk. > >Is there a good way of collecting daily shoeshining statistics ? > >Regards, Peter > >AUS/TAS/DPIW/CIT/Servers hbt/lnd/l8 6233 3061 http://www.pjb.com.au >Pasari, pasarimos dice el agua y canta la verdad contra la piedra > -- Pablo Neruda >