[Ocfs2-users] Two node performance question

[Bruce Leggett]

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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