Re: [Xen-API] XCP 1.0-beta: md on dom0 kernel causes kernel oops

[Simon Rowe <simon.rowe@xxxxxxxxxxxxx>]

On Wednesday 01 Dec 2010 23:03:48 Tomoe Sugihara wrote:

> I tried the following two and both ended up with Oops.
> 
> 1. just two regular HDDs --- /dev/sdc and /dev/sde or whatever.
> 
>     Here's how I reproduced just now.Very soon after dd, kernel panics.
> 
>      $ mdadm --create /dev/md0 --level=mirror --raid-devices=2 /dev/sdc
> /dev/sde mdadm: /dev/sdc appears to be part of a raid array:
>          level=raid1 devices=2 ctime=Mon Nov 29 15:52:53 2010
>      mdadm: /dev/sde appears to be part of a raid array:
>          level=raid1 devices=2 ctime=Mon Nov 29 09:34:34 2010
>      Continue creating array? y
>      mdadm: array /dev/md0 started.
>      $ dd if=/dev/zero of=/dev/md0 bs=1M
> 
> 
> 
> 2. dm linear devices which are on top of iscsi
> 
>    mdadm --create /dev/mirror/000008bc --auto=md --bitmap=internal
> --metadata=0 --run --bitmap-chunk=65536 --delay=5   --level=1
> --assume-clean --raid-devices=3 /dev/mapper/00000001-00000003
> /dev/mapper/00000002-000002d7 /dev/mapper/00000003-0000050a
> 
>     Interestingly, his doesn't cause kernel panic; similar stack trace
> shows up in dmsg and mdadm stalls.

We don't support (and therefore test) software RAID in XenServer. I'll some of 
our kernel guys if there's anything obvious.

        Simon

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