David, I originally set my TS7510 to the default 300GB vtape size with dynamic allocation where only 5GB is initially allocated and the space is grown as data is written. I found out that once data is written to a vtape, the vtape will retain that size until it is scratched AND THEN written to again - at which point it will revert to the initial size. I had a bunch of scratch vtapes that were consuming 300GB of space on the VTL because they were not written to AFTER they had been scratched.
I now use 60GB 3592J vtapes on my TS7520 and it seems to work well. By the way - If you also use dynamic allocation, make sure you patch your TS7520 to Version 05F which was just released yesterday. I have experienced numerous system hangs because there is a bug that causes a race condition when two or more vtapes are being resized simultaneously. Cheers, Neil Strand Storage Engineer - Legg Mason Baltimore, MD. (410) 580-7491 Whatever you can do or believe you can, begin it. Boldness has genius, power and magic. -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of David E Ehresman Sent: Thursday, November 29, 2007 9:01 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 IMPORTANT: E-mail sent through the Internet is not secure. Legg Mason therefore recommends that you do not send any confidential or sensitive information to us via electronic mail, including social security numbers, account numbers, or personal identification numbers. Delivery, and or timely delivery of Internet mail is not guaranteed. Legg Mason therefore recommends that you do not send time sensitive or action-oriented messages to us via electronic mail. This message is intended for the addressee only and may contain privileged or confidential information. Unless you are the intended recipient, you may not use, copy or disclose to anyone any information contained in this message. If you have received this message in error, please notify the author by replying to this message and then kindly delete the message. Thank you.
