I have a server that I recently migrated from CentOS 5.6 to SL6.1.  The host 
install serves as a basic disk server and runs our nightly backups with 
amanda.  We also have several virtual machines running on it, so of which are 
mostly idle and others which can be quite busy.  Since making the move I'm 
seeing the disk and network response/performance go to hell if I have any 
non-idle VMs running.  One barometer - I have a raid10 rebuild running at the 
moment.  With no VMs I can reach 200,000K/sec resync speed.  I'm getting 
131,000K with two idle VMs and some other basic activity.  If I start a busy 
vm, it drops to a few hundred K/sec and all disk access is very slow. 
Response to keystrokes in a network shell can be very slow as well.

As anyone else experienced problems like this?  I'm not seeing any error 
messages on the host or VMs.

-- 
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
3380 Mitchell Lane                  [log in to unmask]
Boulder, CO 80301              http://www.cora.nwra.com