So from the sound of it, a slightly less optimal version of Method A gets used. It will keep one tape mounted until all running or MediaW sessions get their crack at it, but while those other sessions are waiting for access to the tape they won't move on to attempt getting data from other tapes.
>>> [EMAIL PROTECTED] 08/18/06 11:30 AM >>> TSM will mount and start as many sessions as possible, and the rest will be in 'wait media' state until the tape they need (or a tape drive) becomes available. Given your scenarion, you may have one session reading tape and the other four waiting for access to the same tape. When the first session has retrieved ALL the files it needs from the first tape, it will go to the second (if not in use) and the session that has been waiting the longest will now get access to that first tape. Tom Kauffman NIBCO, Inc -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Troy Frank Sent: Friday, August 18, 2006 12:23 PM To: [email protected] Subject: server restore behavior This is more of a curiosity question than a problem. In a multiple-client restore scenario where you start up say 5 restores at once from different nodes (with 4 tape drives, and resourceutilization set to 4 on nodes), how does the server process the request? Technically, data from all 5 nodes are probably on a lot of the same tapes. Does it.... A) mount each tape exactly once, getting all data for all running restores off that tape before unmounting. B) Process the restores relatively serially for each node, giving each all 4 drives until completed. Unmounting/remounting the same tapes multiple times. C) Only give each node 1 tape drive to work with, which will effectively ellicit behavior very similiar to option B. Or does it do something different than any of these? Confidentiality Notice follows: The information in this message (and the documents attached to it, if any) is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken, or omitted to be taken in reliance on it is prohibited and may be unlawful. If you have received this message in error, please delete all electronic copies of this message (and the documents attached to it, if any), destroy any hard copies you may have created and notify me immediately by replying to this email. Thank you. CONFIDENTIALITY NOTICE: This email and any attachments are for the exclusive and confidential use of the intended recipient. If you are not the intended recipient, please do not read, distribute or take action in reliance upon this message. If you have received this in error, please notify us immediately by return email and promptly delete this message and its attachments from your computer system. We do not waive attorney-client or work product privilege by the transmission of this message. Confidentiality Notice follows: The information in this message (and the documents attached to it, if any) is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken, or omitted to be taken in reliance on it is prohibited and may be unlawful. If you have received this message in error, please delete all electronic copies of this message (and the documents attached to it, if any), destroy any hard copies you may have created and notify me immediately by replying to this email. Thank you.
