Re: FreeBSD guest hogs cpu after disk delay?

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On Sun January 3 2010, Thomas Fjellstrom wrote:
> I have a strange issue, one of my free bsd guests started using up 100%
>  cpu and wouldnt respond in the console after a md-raid check started on
>  the raid1 volume the vm has its lvm volumes on. About the only thing I
>  could do was force the vm off, and restart it. In the guests console
>  there was some kind of DMA warning/error related to the guest's disk
>  saying it would retry, but it seems it never got that far.
> 

I forgot to mention, the host is running debian sid with kernel 2.6.31-1-
amd64, and kvm --version reports:

QEMU PC emulator version 0.10.50 (qemu-kvm-devel-88)

the hosts / and the vm volumes all sit on a lvm volume group, ontop of a md-
raid1 mirror of two Seagate 7200.12 500GB SATAII drives.

The host is running 7 other guest which all seem to be running smoothly, 
except both freebsd (pfSense) based guests which seemed to have locked up 
after this message:

ad0: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=16183439

Though the second freebsd guest didn't seem to use up nearly as much cpu, 
but it uses up far lower resources than the first.

-- 
Thomas Fjellstrom
tfjellstrom@xxxxxxx
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