Migrated Ubuntu guest crashing

[bemar]

Hello,

I currently have the problem, that a migrated Ubuntu guest is crashing when the activity of the guest is rising.
The dmesg kernel log of the Proxmox VMHost is full of error messages like:

sd 19:0:0:0: [sdb] READ CAPACITY failed
sd 19:0:0:0: [sdb] Result: hostbyte=DID_TRANSPORT_FAILFAST driverbyte=DRIVER_OK
sd 19:0:0:0: [sdb] Sense not available.
sd 19:0:0:0: [sdb] Asking for cache data failed
sd 19:0:0:0: [sdb] Assuming drive cache: write through
__ratelimit: 6699 callbacks suppressed
Buffer I/O error on device dm-3, logical block 1078874
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1089843
lost page write due to I/O error on dm-3
__ratelimit: 6390 callbacks suppressed
Buffer I/O error on device dm-3, logical block 1052783
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1052784
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1052785
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1052786
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1052787
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1052788
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1052789
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1052790
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1052791
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1052792
lost page write due to I/O error on dm-3
__ratelimit: 5578 callbacks suppressed
Buffer I/O error on device dm-3, logical block 1089898
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1089899
lost page write due to I/O error on dm-3
Buffer I/O error on device dm-3, logical block 1089900
lost page write due to I/O error on dm-3

What is the partition /dev/dm-3 for? Its 21.5 Gigabytes in size.

Disk /dev/dm-3: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x9da45344

     Device Boot      Start         End      Blocks   Id  System
/dev/dm-3p1   *           1          13      102400    7  HPFS/NTFS
Partition 1 does not end on cylinder boundary.
/dev/dm-3p2              13        3133    25061376    7  HPFS/NTFS

Thanks for any hints

Ben

 

[cogarg]

/dev/dm-3p1 * 1 13 102400 7 HPFS/NTFS
/dev/dm-3p2 13 3133 25061376 7 HPFS/NTFS

Shouldn't dm-3p2 start at sector 14, since dm-3p1 ends at sector 13 ?

 

[bemar]

It seems the dm-X (X greater than 2) partitions are the partitions for the running guests. When I stop the guests the partitions disappear.
But the dm-3 partition, which are in the error logs of my first post, has nothing to do with the ubuntu guest which freezes under high load.

Which logfiles are interesting for me to find out? The kernel-, fail- and syslogs of the ubuntu guest itself doesn't have any errors or problems.
It just freezes.

The guest is a KVM machine. The VMHost (Proxmox 2.0 rc1) has the latest updates.

Thx in forward

Ben