RE: Poor disk IO performance from Windows 2003 guest

2011-03-02 Thread Kevin Clark
There are a lot of variables here. Are you using virtio-blk devices and Windows guest drivers? No, those measurements were taken when I was using IDE emulated drives. To further clarify the NFS server is also software, not hardware, RAID-5. But your subtle hint and IBMs Best practices

Re: Poor disk IO performance from Windows 2003 guest

2011-03-02 Thread Stefan Hajnoczi
On Wed, Mar 2, 2011 at 10:30 AM, Kevin Clark kevin.cl...@csoft.co.uk wrote: The results are much better, with 64MB writes on the system drive coming in at 39MB/s and reads 310MB/s.  The second drive gives me 94MB/s for writes and 777MB/s for reads for a 64MB file.  Again, that's wildy

Re: Poor disk IO performance from Windows 2003 guest

2011-03-01 Thread Stefan Hajnoczi
On Tue, Mar 1, 2011 at 10:23 AM, Kevin Clark kevin.cl...@csoft.co.uk wrote: Any thoughts/ideas? There are a lot of variables here. Are you using virtio-blk devices and Windows guest drivers? Are you using hardware RAID5 on the NFS server? Could it be a network issue (contention during