Re: raid1 + 2.6.27.7 issues

[Jon Nelson <jnelson-linux-raid@jamponi.net>]

On Mon, Feb 9, 2009 at 1:30 PM, Bill Davidsen <davidsen@tmr.com> wrote:
> Jon Nelson wrote:
>>
>> I don't think so. This is how I *remove* the nbd device:
>>
>> mdadm /dev/md11 --fail /dev/nbd0
>> sleep 3
>> mdadm /dev/md11 --remove /dev/nbd0
>>
>> and then finally nbd-client -d /dev/nbd0
>>
>> If necessary, I can try to simulate the problem by using a local
>> logical volume or some such.
>>
>
> I would try this with just the first step. I looked at the code briefly, and
> I think the write intent bitmap will not get built for a removed device but
> will for failed. In any case it's certainly something you can easily try.

Nope. :-(  --remove is necessary.

turnip:~ # mdadm --fail /dev/md11 /dev/nbd0
mdadm: set /dev/nbd0 faulty in /dev/md11
turnip:~ # mdadm --re-add /dev/md11 /dev/nbd0
mdadm: Cannot open /dev/nbd0: Device or resource busy
turnip:~ # mdadm --add /dev/md11 /dev/nbd0
mdadm: Cannot open /dev/nbd0: Device or resource busy
turnip:~ #


-- 
Jon