Re: VMWare and Oracle IO
- From: Andrew Kerber <andrew.kerber@xxxxxxxxx>
- To: "niall.litchfield@xxxxxxxxx" <niall.litchfield@xxxxxxxxx>
- Date: Tue, 7 Oct 2014 11:22:43 -0500
Swappiness should be 0. Make sure transparent huge pages are turned off. Dirty
background ratio =3. Dirty ratio=15. Dirty expire centisecs= 500. Dirty write
back centisecs=100
Install package tuned and enable enterprise storage profile. Put
elevator=deadline in grub.conf
Sent from my iPad
> On Oct 7, 2014, at 10:59 AM, Niall Litchfield <niall.litchfield@xxxxxxxxx>
> wrote:
>
> 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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