Re: VMWare and Oracle IO
- From: Niall Litchfield <niall.litchfield@xxxxxxxxx>
- To: Jared Still <jkstill@xxxxxxxxx>
- Date: Tue, 7 Oct 2014 16:59:14 +0100
Hi Jared
How is the storage provisioned to the VMs? Worst case is probably thin
provisioned vmdk on top of a thin provisioned LUN from a storage array
vendor.
On Tue, Oct 7, 2014 at 4:29 PM, Jared Still <jkstill@xxxxxxxxx> wrote:
> Fellow Oracleites:
>
> I have been investigating a client database or two that have been
> experiencing IO problems since being virtualized via VMWare.
>
> SA's claim no IO issues, but we have seen an Oracle IO take up to 3.5
> seconds.
> Seems slow to me.
>
> One thing I have learned is the the priority settings on VMWare disk
> shares can cause this issue for lower priority systems when the favored
> system(s) are requesting a lot of IO.
>
> What other gotcha's should we be looking for?
>
> Thanks!
>
> Jared Still
> Certifiable Oracle DBA and Part Time Perl Evangelist
> Principal at Pythian
> Pythian Blog http://www.pythian.com/blog/author/still/
> Oracle Blog: http://jkstill.blogspot.com
> Home Page: http://jaredstill.com
>
--
Niall Litchfield
Oracle DBA
http://www.orawin.info
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