I recently spent several months looking at disk technologies. Just generally speaking here I found that Disk Based Backups (DSU/DSSUs) are pretty young in Netbackup and there's quite a few issues that have to be monitored and maintained to make them work correctly. That aside, you can't beat the price per GB/TB for raw disk storage versus a VTL. From a management perspective, VTLs I think are easier because media management is so well defined in Netbackup. I've got several Perl scripts I use to manage my DSSUs but everything I need for media is right there in the GUI. As far as compression and block level conversion to different formats etc I think you may be getting a few crossed signals. I've heard quite a few issues with older VTLs especially when people try and duplicate their tapes onto VTLs. I'd check with your hardware vendor, but as best I can tell all those issues were on the "bleeding edge." -Jonathan
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Sixbury, Dan Sent: Wednesday, April 11, 2007 10:04 AM To: veritas-bu@mailman.eng.auburn.edu Subject: [Veritas-bu] Virtual Tape library or backup to disk Does anyone have any recommendations in regards to VTLs or disk pools, etc. for backup? I have seen a lot of stuff on the market, but I have also heard where some people have found out later that some of the technologies don't always work as smoothly as their slated. i.e. one solution I have seen takes all of your data and compresses it into block level format on a separate device, but if you want to restore the data or back it up to tape, you have to first uncompress it to a readable format and then copy to tape. Thanks.
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