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Re: Sony AIT5 tapetype
2007-01-19 15:22:51
Joshua Baker-LePain wrote:
On Fri, 19 Jan 2007 at 11:01am, Chris Hoogendyk wrote
define tapetype SONY-AIT5 {
comment "SONY AIT5 8mm tape drive"
# data provided by Chris Hoogendyk <hoogendyk AT bio.umass DOT edu>
# produced by whacking it for 10 hrs or so with amtapetype
# on a Sun E250 with a Dual Ultra320 LVD SCSI PCI card
length 389120 mbytes
filemark 0 kbytes
speed 24401 kps
}
I'm out of the AIT loop -- what's the rated speed? 24MB/s doesn't
seem all that fast (then again, I'm used to LTO3), and I wonder if you
could increase that with some tweaking.
The rated speed is 24MB/s. I was pleased that my overall setup was tuned
to achieve that, and there were no bottlenecks or gotchas causing
reduced speed or stops & starts. I've set it up with two 300G Seagate
disks for spooling, so I can back up all my servers at once and push
them to tape at maximum speed once they are done.
I expect my tweaking to come in the network area. I have a quad 100
network card in the backup server. We'll see how things work and
consider trunking and a backside network if necessary. I only have one
server that has been backed up over the network in the past (it didn't
have a dds/3 of its own), and I did it with ufsdump piped through ssh to dd.
Do you achieve 80MB/s on your LTO3?
---------------
Chris Hoogendyk
-
O__ ---- Systems Administrator
c/ /'_ --- Biology & Geology Departments
(*) \(*) -- 140 Morrill Science Center
~~~~~~~~~~ - University of Massachusetts, Amherst
<hoogendyk AT bio.umass DOT edu>
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Erdös 4
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