[EMAIL PROTECTED] said:
> They clearly suggest to disable cache flush http://www.solarisinternals.com/
> wiki/index.php/ZFS_Evil_Tuning_Guide#FLUSH .
>
> It seems to be the only serious article on the net about this subject.
>
> Could someone here state on this tuning suggestion ? My cu is running a HDS
> SAN array with Oracle on ZFS, I'd like to be clear in my brain.
There is a brief discussion (in which I participated) at the HDS user
forum site:
http://forums.hds.com/index.php?showtopic=427
Note that we made the change on the array itself, instead of using the
ZFS kernel tunable parameter. Our servers have other storage devices
besides our HDS array, and it's only recently that the tunable has made
its way into standard Solaris-10 releases.
I can say that for us, telling the HDS array to ignore sync-cache requests
made a huge improvement in performance for our NFS clients. The increase
was small for local ZFS operations, including for Oracle, so you'll want
to measure for yourself.
Regards,
Marion
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