Re: Windows IOPS Benchmark

On Wed, Aug 29, 2012 at 8:13 PM, Jonathan Tripathy [off-list ref] wrote:

On 30/08/2012 01:09, Jonathan Tripathy wrote:

quoted

Hi Everyone,

I'm using bcache with a RAID1 pair of SSDs (for the cache) with a
MD-RAID10 spindle array for the backing device. On top of this is LVM. This
setup is used with the Xen Hypervisor. Bcache is formatted with a sector
size of 512 bytes.

If I use an LV for a Linux DomU, I get fantastic disk performance using
fio (about 23k random write). However, when I use IOMeter in a Windows HVM
DomU (with GPLPV drivers installed), my avg IOPS is around 4000. I am using
the "default" Access Specification. Am I doing something wrong? Changing the
number of workers doesn't seem to help.

Any advice is appreciated.

Thanks

Actually nvm, I forgot to enable the dist target for each of the works. Now
I'm getting an avg iops of about 34k.

But this does leave me with a question: is the number of "workers" in
IOMeter akin to "IO Depth" in fio?

I've not used IOmeter, but I would assume that the number of "workers" would
be similar to the number of "jobs" in fio. IO depth/queue depth is the
number of IO requests that are queued for processing at any one time. So, if
you've got 4 workers, each keeping one IO operation queued at all times,
your effective IO depth would be 4, while the IO depth for each job/worker
would be 1. That's my understanding at least.

-davidc