I'd love to have a couple vtl's . . . . "ADSM: Dist Stor Manager" <[email protected]> wrote on 06/08/2007 05:34:03 PM: > > Yes, tape is still cheaper, but if you compare the price of a large VTL > with de-dupe to an equivalently sized tape library, they'll be a lot > closer than you think
I'd love to have a couple vtl's. When we've priced them out they come out to be much more costly (several times) that of tape for our environment. We keep lots of old/stale data around which drives seems to drive the cost of the VTL way up. I was hoping possibly use a vtl for only primary data with the new feature of TSM v5.4, but that's not going to work out. > The second thing VTLs bring to the table is hardware compression. > Then, of course, there's de-dupe, which most surveys are showing to be > the got-to-have technology of this year. It's here. It's real. And it > really does shrink the amount of disk you need to use by a factor of > 10-20:1, and even more depending on how you do your backups. Agreed. I'm convinced that compression and de-dupe is what you're purchasing in a vtl as opposed to just straight disk. It would be a lot cleaper to just purchase disk, but then no compression and no de-dupe. I personal opinion is that VTL's are a stop-gap solution. I think compression and de-dupe have much wider application within a normal disk subsystem where it could apply to a much wider range of situations. A long time ago a company we purchased had a old STK Iceberg disk subsystem . . .yea, the one with with log based writes like NetApp except with hardware compression. The guys who used it have nothing but praise for it (although it had it's problems!!!). NetApp is adding de-dupe to their disk systems . . . .now if they would only add hdwr compression . . . > The reason that VTL/disk can outperform tape is that > disk can go whatever speed your backup is going and tape cannot. This is the bit problem I see with Tape. It seems to me that the latest generations of tape drives have rated speeds that almost defy the any ability to supply them with data. I almost which I could purchase a modern tape drive that actually was slower. > Most environments never get anywhere near their tape's capabilities and > about half or so are getting a small fraction of their tape drive's > capabilities. Exactly . . . . > Just my $.02. > > --- > W. Curtis Preston > > Add my $.02 Rick ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message.
