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So I just got a
SpectraLogic T950 tape library, and after some initial teething pains it's up
and running and it's wicked fast, but being an impatient little monkey of a
NetBackup administrator I'm wondering if I could make it wicked
faster.
My primary backups
go to DataDomain restorers and then are duplicated to tape for offsite storage
with Iron Mountain. When I set all of this up I used 2048 megabytes as the
maximum fragment size in both the disk based and tape based storage units. This
was based on my predecessor's experience with what was the best trade-off
between backup speed and file restoration speed with LTO Gen 2 drives. But I'm
wondering if I can improve backup performance even more by increasing the
fragment size for my disk and LTO4 based storage units without degrading my
current file restoration performance. I thought I would send this to the list to
find out what people were using as the frag sizes on LTO4 and on disk based
storage units such as the DataDomains.
Also if I change the
fragment size on my tape based storage units how does NetBackup handle tapes
that have backups written to them with different fragment sizes. Can this cause
problems? Any feedback will be greatly appreciated.
Thank
You,
Jamie
Jamison
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