VTL vs LTO4 speed comparisons -- MIDRANGE-L

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Completed our quarterly full system saves last week using our Data Domain
2500 Virtual Tape Library. The prior quarter we use an IBM LTO4 library.
Since the amount of disk fluctuates by quarter I enclosed that also.

Disk (GB)
Lpar LTO4 VTL LTO4 VTL
RACK1HST 00:17 00:06 35%
GDWEB 00:33 00:44 133% 268 288
GDIHQ 05:44 04:33 79% 4,389 4,598
GDISYS 04:57 02:43 55% 2,836 2,773
MAIL1 08:22 03:08 37% 3,294 3,464
RACK2HST 00:14 00:07 50%
GDWEB2 00:32 00:23 72% 202 210
GDIHQ2 07:37 02:47 37% 4,341 4,398
GDISYS2 04:49 01:28 30% 2,070 2,106
MAILTWO 06:52 02:10 32% 3,236 3,534
RACK3HST 00:18 00:06 33%
MAIL3 02:26 00:51 35% 1,166 1,126
GDI 00:58 00:25 43% 429 380
GDWEB3 00:40 00:06 15% 113 125
DOMTEST 00:33 00:10 30% 165 153

I had one lpar take longer but otherwise I'm quite impressed.
We ran these lpars simultaneously.
GDIHQ 8:19 - 12:52
GDISYS 8:36 - 11:19
MAIL1 8:40 - 11:48
GDWEB 9:12 - 9:56 <-Area of concern.

Two other groups which could have been ran at the same time weren't due to
some interruptions. Like all the "2" machines (except their hosting lpar)
and all the "3" machines (except it's hosting lpar).

Rob Berendt

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