I am using KVM 69 and kernel 2.6.25.17 to host several VM's in a large 
server.  So far, everything has been great.  Except I'm adding a Windows 
Server VM that will run a SQL Server database.  A few times I've noticed 
that I/O becomes a bottleneck for the VM and Windows VM freezes for a few 
seconds.  Oh well, no biggie.  Except, every so often, these I/O bottlenecks 
start to affect other VM's and they freeze as well for a few seconds.  I 
don't really care of one VM does so much I/O that it freezes itself 
temporarily.  I just don't want I/O bottlenecks on one VM to affect other 
VM's.

My questions are:

1. Is this a problem anyone else has experienced and has it been fixed in a 
later KVM release?

2. I'm using the CFQ scheduler.  Would the deadline scheduler do a better 
job?

3. Any other suggestions to improve this problem?
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