[Xen-users] All VMs are "blocked", terrible performance

[Madison Kelly <linux@xxxxxxxxxxx>]

Hi all,

  I've built up a handful of VMs on my 2-node cluster and all are 
showing as being in a blocked state. The performance is terrible, too. 
All VMs are currently on one node (another problem, maybe related? is 
keeping me from migrating any).
My Setup:
(each node)
2x Quad Core AMD Opteron 2347 HE
32GB RAM (16GB/CPU)

Nodes have a DRBD partition running cluster-aware LVM for all domU VMs. 
Each VM has it's own logical volume. The DRBD has a dedicate gigabit 
link and DRBD is using 'Protocol C', as required. LVM is set to use 
'locking_type=3'.
Here's what I see:

# xm list
Name       ID Mem(MiB) VCPUs State   Time(s)
Domain-0    0    32544     8 r-----  22400.8
auth01     10     1023     1 -b----   3659.7
dev01      22     8191     1 -b----    830.2
fw01       11     1023     1 -b----   1046.9
res01      23     2047     1 -b----    812.1
sql01      24    16383     1 -b----    817.0
web01      20     2047     1 -b----   1156.3
web02      21     1023     1 -b----    931.1

  When I ran that, all VMs were running yum update (all but two were 
fresh installs).
Any idea what's causing this and/or why my performance is so bad? Each 
VM is taking minutes to install each updated RPM.
In case it's related, when I tried to do a live migration of a VM from 
one node to the other, I got an error saying:
VM Disk dom0_vg0/web02.disk.xm not found on the destination node vsh03

However, '/proc/drbd' shows both nodes are sync'ed and in 
Primary/Primary mode. Also, both nodes have identical output from 
'lvdisplay' (all LVs are 'active') and all LVs were created during the 
provision on the first node.
Kinda stuck here, so any input will be greatly appreciated! Let me know 
if I can post anything else useful.
Madi

PS: dom0 and all domU are running CentOS 5.4 x86_64

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