The library manager allocates the drives to the server instances that request mounts. If more mounts are requested than there are available drives, then the most recent mount requests have to wait until a drive becomes available. This is a pretty common occurrence in our environment at certain times of the day. It doesn't hurt anything - it just makes some processes take a little longer.
There's no need to adjust the number of tape drives available to each server, unless one server has more critical processing to do and must have priority to the drives over the other server. If all of the drives are available to both of the TSM instances, the library manager will honor mount requests on available drives as the requests come in. Robben Leaf From: Thomas Denier <[EMAIL PROTECTED]> To: [email protected] Date: 12/10/2008 03:19 PM Subject: [ADSM-L] Library manager oversubscription Sent by: "ADSM: Dist Stor Manager" <[email protected]> I support a TSM server running under mainframe Linux. The database has been growing at varying rates since we installed TSM. We are starting to think about splitting the workload between two TSM servers if there is a major growth spurt before we upgrade to 6.1 (we are currently at 5.4.2.0). If we did this we would set up a third server to act as a library manager for the other two. We would want to be able to adjust the number of tape drives available to each server to adjust to variations in the workload. This would be done by adjusting the mountlimit settings for the tape device classes. What would happen if we made a mistake in this process and ended up with the servers collectively requesting more tape drives than actually exist? U.S. BANCORP made the following annotations --------------------------------------------------------------------- Electronic Privacy Notice. This e-mail, and any attachments, contains information that is, or may be, covered by electronic communications privacy laws, and is also confidential and proprietary in nature. If you are not the intended recipient, please be advised that you are legally prohibited from retaining, using, copying, distributing, or otherwise disclosing this information in any manner. Instead, please reply to the sender that you have received this communication in error, and then immediately delete it. Thank you in advance for your cooperation. ---------------------------------------------------------------------
