Caveat: We have not used HiDRO yet, other than figuring out a way for it to actually write two tapes with different volsers at the same time.
What about completing the local HiDRO backup job, and then running its process to read in the local copy and write it to volume with the same volser at the remote site. Or, is that the same as the "synchronous twinning" you refer to? That means that the disk access is only performed once (as opposed to possible repeat backups for separate tapes), speeding real backups. It's just the tape that's used twice (once write, followed by job(s) to read it and write its identical-volser twin far offsite). Given that our data centers are only about 3 miles apart, we did not want to use the same volsers in both campuses for fear that one or more tapes might somehow travel between campuses just before a real disaster, leaving us with no copies of those backup tapes at the surviving data center. Tapes that are really, truly many miles apart are less likely to become "illegal immigrants". Mark Llewellyn <[EMAIL PROTECTED]> Sent by: "The IBM z/VM Operating System" <[email protected]> 06/05/2008 03:12 PM Please respond to "The IBM z/VM Operating System" <[email protected]> To [email protected] cc Subject VM:Backup: Twinning Tapes to Remote Tape Unit Greetings, We are ramping up our Technical Recovery Plan, and intend to use channel- extended tape units at a remote location when performing our regular full and incremental backups. We use CA's VM:BACKUP for file-level backups, and will be using VM:HiDRO to capture the system image. We're curious as to whether any other CA customers are using the synchronous tape "twinning" feature with one loca l tape unit and one remote. We've been cautioned by our network folks that the response time from the remote tape unit would be quite a limiting factor affecting the speed of a synchronous, twinned backup. 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. Any anecdotes or insight would be most welcome! Mark Llewellyn VM Systems Support Visa, Inc. 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.
