Re: [Xen-users] Extremely poor iSCSI performance

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

I see similar behavior with OCFS2 on my 4 and 2-node clusters.  Usually this 
happens when I'm creating a new disk file...since OCFS2 does not support sparse 
disks it actually creates the whole disk, and I often see large hangs while 
this is happening.  I suspect that OCFS2 is the cause - I think something about 
the file locking on the OCFS2 cluster causes this.

-Nick

>>> On 2010/01/22 at 08:28, Joseph Coleman <joe.coleman@xxxxxxxxxxxxxxxxxx> 
>>> wrote:

> Hi all not sure if anyone can help  but I have an OCFS2 volume setup on my 4 
> xen  nodes. If you do like 4  cp copies to the iscsi volume the systems pause 
> for up to 30 seconds as well as the VM itself. The San looks fine and I am 
> not taxing the xen server either anyone else seen this?




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