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[Xen-users] problem accessing swap partition on a xen machines

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] problem accessing swap partition on a xen machines
From: Michael Gregg <mgregg@xxxxxxxxxxxxxxxx>
Date: Mon, 31 Oct 2005 13:30:37 -0800
Delivery-date: Tue, 01 Nov 2005 16:53:53 +0000
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I'm using debian stable with a recompiled xen dom0 kernel. 

running debian on any domu.

My partitions are drives created with lwm.

I'm having problems with my swap partiton getting corrupted. When I get
the problem, if I pull the data from the swap with dd and get errors. If
I wait a few minutes, the problems go away.

Has anybody seen this? Does anybody have any idea on howto solve this?
Please ask questions if you need more information.

problem observed:
mg-gws:~# dd if=/dev/sda2 of=/dev/null
end_request: I/O error, dev sda2, sector 5080
end_request: I/O error, dev sda2, sector 5120
end_request: I/O error, dev sda2, sector 5208
end_request: I/O error, dev sda2, sector 5296
end_request: I/O error, dev sda2, sector 5384
end_request: I/O error, dev sda2, sector 5392
end_request: I/O error, dev sda2, sector 5424
end_request: I/O error, dev sda2, sector 5464
end_request: I/O error, dev sda2, sector 5552
end_request: I/O error, dev sda2, sector 5640
2097152+0 records in
2097152+0 records out
1073741824 bytes transferred in 10.769949 seconds (99697949 bytes/sec)

1 minute after problem. 
mg-gws:~# dd if=/dev/sda2 of=/dev/null
2097152+0 records in
2097152+0 records out
1073741824 bytes transferred in 10.769949 seconds (99697949 bytes/sec)

My xen config is as follows:

# Creator: michael gregg
# Creation Date: Wed Oct 26 11:51:54 PDT 2005
# contact email: mgregg -at- propel.com
# created with: CreateXenVm mg-gws 192 michael gregg
#
vif  = ['mac=42:42:00:80:01:92']
interface = "eth0"
memory = 128
name = "mg-gws"
kernel = "/boot/xen-linux-2.6.11-ocxenu"
disk = ['phy:vg/mg-gws_data,sda1,w' ,'phy:vg/mg-gws_swap,sda2,2']
root = "/dev/sda1"
# assigned IP Address: 172.16.80.192


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