Use of the VM:Tape command exit provides a means to automagically swap the mount command volsers in any order you desire. Works great for us after most operators moved to the remote campus. Now, without swapping onsite and offsite tape vaults, read mounts are swapped to the remote site where tape operators have moved. For D.R. the command exit automatically detects which campus we're running in, and mount the tape at that campus. Cool!
Mike Walter Hewitt Associates ----- Original Message ----- From: "Mark Wheeler" [EMAIL PROTECTED] Sent: 06/06/2008 06:48 PM EST To: [email protected] Subject: Re: VM:Backup: Twinning Tapes to Remote Tape Unit Mark Llewellyn wrote on 06/05/2008 03:12:50 PM: > > Our other option is to simply run two backup jobs, one to the local drive > and one to the remote, but that effectively doubles the hit of the backup > jobs. The (I/O) performance hit on this might not be as high as you think. If you ran the two backup jobs concurrently (allowed by VM:Backup), the second job (they won't be exactly in sync) can benefit by "drafting" (for all you NASCAR fans) behind the other through the magic of minidisk caching. In such a scenario, VMBACKUP should probably have OPTION NOMDCFS in its directory definition. This is also assuming that: 1) one job doesn't get too far out of sync with the other (ex remote tape drives much slower than local) 2) you have sufficient storage for MDC, to make it worthwhile as a tradeoff for I/O. That said, I would still avoid this option. Restores will be based (generally) on the "last" backup in the catalog, which will likely be associated with the slowest-running backup job. Meaning tapes at the remote (aka "slowest") location will be used. You could adjust for this (could casual users?), but it would be a PITA. Alternatively, you could configure two VMBACKUP machines (ex VMBACKUP and VMBREMOT), but that wouldn't be pretty either. Best regards, Mark Wheeler, 3M Company The information contained in this e-mail and any accompanying documents may contain information that is confidential or otherwise protected from disclosure. If you are not the intended recipient of this message, or if this message has been addressed to you in error, please immediately alert the sender by reply e-mail and then delete this message, including any attachments. Any dissemination, distribution or other use of the contents of this message by anyone other than the intended recipient is strictly prohibited. All messages sent to and from this e-mail address may be monitored as permitted by applicable law and regulations to ensure compliance with our internal policies and to protect our business. E-mails are not secure and cannot be guaranteed to be error free as they can be intercepted, amended, lost or destroyed, or contain viruses. You are deemed to have accepted these risks if you communicate with us by e-mail.
