I am seeing a Fedora 8 64-bit PV guest encounter I/O errors when
attempting to access a block attached mirrored device. For instance,
when I try to partition the device and create a filesystem on it, I see
the following output going to syslog.
Buffer I/O error on device xvdd, logical block 0
lost page write due to I/O error on xvdd
xvdd: unknown partition table
xvdd: unknown partition table
end_request: I/O error, dev xvdd, sector 0
Buffer I/O error on device xvdd, logical block 0
lost page write due to I/O error on xvdd
Buffer I/O error on device xvdd, logical block 1
lost page write due to I/O error on xvdd
Buffer I/O error on device xvdd, logical block 2
...
The mirrored device can be accessed and written to from dom0, and
metastat does not report any problems:
# metastat
d1: Mirror
Submirror 0: d10
State: Okay
Submirror 1: d11
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 10477568 blocks (5.0 GB)
d10: Submirror of d1
State: Okay
Size: 10477568 blocks (5.0 GB)
Stripe 0:
Device Start Block
Dbase State Reloc Hot Spare
/dev/dsk/c1t600144F048F8BA0600001B245CC83300d0s2 0
No Okay Yes
d11: Submirror of d1
State: Okay
Size: 10477568 blocks (5.0 GB)
Stripe 0:
Device Start Block
Dbase State Reloc Hot Spare
/dev/dsk/c1t600144F048F8BADA00001B245CC83300d0s2 0
No Okay Yes
The guest seems to have no problem handling block-attached devices that
are not mirrored.
I am wondering if anyone has experienced similar issues and/or can
provide pointers on what is going amiss?
Thanks in advance,
Juan