On Wed, Mar 15, 2006 at 11:48:57AM -0500, Guy Dallaire wrote:
> There was a recent discussion on the list regarding ultrium LTO3 tape
> speed/performances.
> 
> According to my vendor, the LTO2 drive I'm about to buy is capable of
> 80Gb/Hour, that is approx 50 Mb/Sec if I'm right.
> 
> I'm currently using an adaptec AHA2940U adapter with my DLT4000 drive.
> I think it's only capable of 20 Mb / Sec...
> 
> I have a couple of question:
> 
> What adapter should I buy to feed the LTO2 drive ? It need to be
> compatible with centos 4.2 (RHEL 4 clone)
> 
> Provided I buy the correct adapter along with the tape drive, and my
> holding disk is dedicated to amanda (it's a single 200 Gb ATA drive)
> how am I to know (measure) if my tape server is feeding the tape drive
> appropriately ? Would I be better using an SATA drive instead of an
> ATA drive ?
> 
> Wouldn't the dumpers compete for I/O's on the holding disk with the
> taper process ? Or does the taper process begins writting to tape only
> when all the dumpers have finished ?
> 
> Where sould I look to see if my tape drive is fed properly ?
> 

A disk system performance measuring tool you can download
and compile is "bonnie++".

-- 
Jon H. LaBadie                  jon AT jgcomp DOT com
 JG Computing
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