Check out the "Maximum Size Threshold" that is defined for the disk pool in question. Perhaps you are trying to back up a file larger than the threshold and now TSM needs to mount a tape to handle that file...
-Jeff Nast SMDC Health Systems Duluth MN -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[email protected]] On Behalf Of John D. Schneider Sent: Friday, April 30, 2010 10:33 AM To: [email protected] Subject: Re: mediawait during backup to disk Keith, You could mitigate this somewhat by creating more disk storage pool volumes, and spreading them across more physical disks. I don't entirely agree with Allen that your disk pool is going to be slower than your incoming networks. It is certainly possible to build a disk storage pool environment that can respond that fast. However, you have to decide whether it is worth spending any money to do so. How close are you to running outside your backup window? If you are getting all your backups done in a timely manner, then the actual speed doesn't matter. But if you are pressing your window, you might have justification for some engineering improvements. Best Regards, John D. Schneider The Computer Coaching Community, LLC Office: (314) 635-5424 / Toll Free: (866) 796-9226 Cell: (314) 750-8721 -------- Original Message -------- Subject: Re: [ADSM-L] mediawait during backup to disk From: "Allen S. Rout" <[email protected]> Date: Fri, April 30, 2010 10:14 am To: [email protected] >> On Fri, 30 Apr 2010 11:07:35 -0400, Keith Arbogast <[email protected]> said: > What does it mean when a node incurs mediawait during a backup to > disk? It means that the process was blocking on disk writes. Your disk (usually) can't write as fast as your various networks can pass you data. So there's some fraction of media wait, on a fine granularity. - Allen S. Rout This e-mail communication and any attachments may contain confidential and privileged information for the use of the designated recipients named above. If you are not the intended recipient, you are hereby notified that you have received this communication in error and that any review, disclosure, dissemination, distribution or copying of it or its contents is prohibited. As required by federal and state laws, you need to hold this information as privileged and confidential. If you have received this communication in error, please notify the sender and destroy all copies of this communication and any attachments.
