[Ocfs2-users] Two node performance question

[Sunil Mushran]

Hard to answer such a qs. It is always best to run your workload
on a SAN and see the app thruput.

Bruce Leggett wrote:
> Sunil,
> I am continuing to build my IO to the point where my app works well via two nodes. I may abandon building an opensource SAN and just move to an established product. 
>
> Our app generates a lot of load through enormous small read and writes eating IO. My follow up question is, if we move to a new name brand san - do we just go after the one with the best IO numbers?
>
> We're looking at a IBM shark model or Xitech ICE and I want to make sure I get something that will be good to OCFS2 and IO. 
>
> Thanks, 
>
> Bruce A Leggett
> Director, IT Systems
> Amscot Financial
> 813-637-6283
>
> -----Original Message-----
> From: Sunil Mushran [mailto:sunil.mushran at oracle.com] 
> Sent: Friday, September 18, 2009 4:30 PM
> To: Bruce Leggett
> Cc: 'ocfs2-users at oss.oracle.com'
> Subject: Re: [Ocfs2-users] Two node performance question
>
> Bruce Leggett wrote:
>   
>> The FS performance is only slow from one node. Typically, writes and reads look good one node at a time, but not two.
>>     
>
> If concurrent io to the shared device is slow, then this would be expected.
>
>   
>> So your recommendation is I need to get throughout/IO boosted at the iscsi/disk/san level? Optimizing iscsi and upping performance with more / faster disks etc?
>>     
>
> Yes.
>
>   
>> Are there any OCFS2 options that play into this or is it all iscsi/disks at this point? 
>>     
>
> The ocfs2 options allow you to tune your performance for different
> workloads. But it is not going to hide slow concurrent io to the shared
> device.
>
>
>
>
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