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On 11/09/2007, Mike DeMarco <mikejd42@xxxxxxxxx> wrote:
> > I've got 12Gb or so of db+web in a zone on a ZFS
> > filesystem on a mirrored zpool.
> > Noticed during some performance testing today that
> > its i/o bound but
> > using hardly
> > any CPU, so I thought turning on compression would be
> > a quick win.
>
> If it is io bound won't compression make it worse?
Well, the CPUs are sat twiddling their thumbs.
I thought reducing the amount of data going to disk might help I/O -
is that unlikely?
> > benefit of compression
> > on the blocks
> > that are copied by the mirror being resilvered?
>
> No! Since you are doing a block for block mirror of the data, this would not
> could not compress the data.
No problem, another job for rsync then :)
--
Rasputin :: Jack of All Trades - Master of Nuns
http://number9.hellooperator.net/
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