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