David,
Your question is a good one. On our EMC Disk Libraries we
emulate LTO1 tape drives, with 50GB maximum tapes. I believe this
improves overall disk utilization for just the reason you mention. You
can reclaim the smaller tapes sooner. TSM won't have to wait until
~250GB of data, which may have been written over a period of weeks,
expires before the virtual tape is ready to reclaim.
Best Regards,
John D. Schneider
Lead Systems Administrator - Storage
Sisters of Mercy Health Systems
Email: [EMAIL PROTECTED]
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of
David E Ehresman
Sent: Thursday, November 29, 2007 8:01 AM
To: [email protected]
Subject: [ADSM-L] Sizing virtual tapes
How large are you making the max size of your virtual tapes? Why?
I let my TS7520 emulating 3592E tapes default to a max size of 460GB but
I'm starting to think a smaller size would make more sense. The median
size of occupancy for my nodes is around 40GB so I'm thinking that might
be a better max size to facilicate reclamination.
David
