LTO4 is rated at 120MB/s, so I'm guessing you factored in some compression to get that up to 350MB/s. Regardless, using the 350MB/s as a starting point, I think it works out to 1 tape drive being able to move 11PB/yr (just using "PB/yr" makes me cringe). I actually came up with 4.5 tape drive years for 50PB.
We know about the changes coming in the next version of TSM. I've heard that DB2 databases can be bigger, but how much bigger? I'm guessing we'll still need to deal with multiple instances - just not sure what order of magnitude (10s or 100s of servers). ..Paul At 11:20 AM 1/25/2008, Kauffman, Tom wrote:
I *may* have screwed up the math here -- but IF you can drive some number of LTO4 drives at maximum compression and full rated write speed of 350 MB/Second for the 800GB per tape, I get 1,322 tape drive days or 3.6 tape drive years for the first pass. Not counting mount/dismount time. 1,322 tape drives to do the backup in one day. Boy, I hope my math is off! And I'm glad I don't have to do the recovery plan for this! Tom Kauffman NIBCO, Inc
-- Paul Zarnowski Ph: 607-255-4757 Manager, Storage Services Fx: 607-255-8521 719 Rhodes Hall, Ithaca, NY 14853-3801 Em: [EMAIL PROTECTED]
