On Thu, Oct 18, 2007 at 11:06:00AM -0500, John Foley wrote:
>
> - is there a way to tell what the data rate to the tape drive is
> from the filer, over the SCSI bus ? I'm looking for more of an
> instantaneous measurement, rather than the overall average of
> (amount of data moved / time it took).
Are you looking at sysstat? It has a tape performance column.
> - anyone else played around with this (ie, attempting to measure the
> data throughput from filer to SCSI attached tape drive) ? If so,
> what did you try, and what conclusions did you reach ?
What is the rate you're getting?
Is this with 'dump' or some commercial backup package? I might want
to compare the speed between the backup package, just running a 'dump'
on the same filesystem (will eliminate the production of catalog
history data), and running a dump to the 'null' device. If the filer
is under load, the tape drive may not be your bottleneck.
-- Darren Dunham ddunham@taos.com Senior Technical Consultant TAOS http://www.taos.com/ Got some Dr Pepper? San Francisco, CA bay area < This line left intentionally blank to confuse you. >
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