cdelorme at gmail
May 1, 2012, 9:59 PM
Post #1 of 6
Hey Xen Users,
I have a question about Block IO Performance in Xen, and was wondering if
anyone can help explain it to me.
I am running Windows 7 x64 HVM on an LVM Partition.
The main partition is on a SSD Drive, I also have another set of LVM
partitions on storage drives that I mount from time to time.
I found the IO speeds to be a bit... unusual.
For example, I tried to copy data off of a USB Drive to my main drive (SSD
LVM Partition) and the speed started at 300Mbps, then slowly over roughly a
minute dropped down to 15Mbps. Similarly I tried doing the same to a
storage LVM and it started at 176Mbps then dropped to the same 15~ Mbps
Given that it starts at a higher amount am I to assume this is a mistake in
the early calculations? Or is this a problem with disk configuration?
I should note that WEI rates the disk at a 6.8 in this HVM, so it
"shouldn't" be slow I would imagine.
If anyone has an insights I would greatly appreciate it, as a last resort I
may consider PV Drivers, I am open to everyones opinion about that.