Sounds like you're using ZFS on Solaris. ZFS is geared toward data
reliability over speed.
You should use the solaris equivalent of iotop to identify what's using
disk IO. simply put though, if amanda's not running, amanda's not
causing the disk usage. It's possible that something hardware is
failing. check your error logs. Long timeouts on disks can cause
symptoms like what you describe. Even if there are no errors, try
reseating any cables that may have been moved, adjusted, or jostled
since the last time you had no issues.
On 12/5/2011 10:42, Brian Cuttler wrote:
Charles,
We are already using pigz, it makes a huge difference.
We are seeing a lot of sluggishness, command line, during
the day when amanda ISN'T running. Perhaps also for the
samba shares, though I don't map any from this box.
I'm trying to differentiate CPU vs Disk I/O and amanda running
vs amanda not running.
When I hear "amanda is running gzip --best" and that is why
we are slow, it makes me nuts, because I'm pretty sure that
whatever the compression is its not causing the I/O bottleneck
hours after amanda completes, and I really believe that after
looking into this previously the --best it attached to the
thread that is producing the index files, rather than the
half of the tee that generates data for work area/tape.
Box is an x4500 (I'll recheck that) with lots of fibre/fabric
attached disk in the form of zpools.
I think we may simply have saturated the system. I just want
to pull amanda out of the equation as early as possible so that
we can pursue the underlying reason(s) for the problem, rather
than become fixated on amanda and my spinning my wheels after
the idea becomes set in other people's minds.
thanks,
Brian
On Mon, Dec 05, 2011 at 11:07:00AM -0700, Charles Curley wrote:
On Mon, 5 Dec 2011 11:43:49 -0500
Brian Cuttler<[email protected]> wrote:
Gzip is a CPU hog, doesn't use any disk I/O, does it ?
It would use I/O if it generates swapping.
If you have a multi-processor box, try pigz.
Description: Parallel Implementation of GZip
pigz, which stands for Parallel Implementation of GZip, is a fully
functional replacement for gzip that takes advantage of multiple
processors and multiple cores when compressing data.
Homepage: http://zlib.net/pigz/
I don't know if that would help with a swapping issue, but it should
help speed up backups anyway.
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