I agree with John. We are currently using 100Gb. volumes in out DL700, but I'm frequently called by user who's restore seems to hang. In most cases the tape is in use by another restore or in use by a backup storagepool/reclamation which first has to finish the file it's backing up or reclaiming. Kindest regards, Eric van Loon KLM Royal Dutch Airlines
-----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Schneider, John Sent: donderdag 29 november 2007 15:55 To: [email protected] Subject: Re: Sizing virtual tapes 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 ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. Koninklijke Luchtvaart Maatschappij N.V. (also known as KLM Royal Dutch Airlines) is registered in Amstelveen, The Netherlands, with registered number 33014286 **********************************************************************
