Re: How to force stopping an array`

["NeilBrown" <neilb@suse.de>]

On Tue, May 27, 2008 9:02 am, Dexter Filmore wrote:
> Am Dienstag, 27. Mai 2008 00:30:26 schrieb Justin Piszcz:
>> On Tue, 27 May 2008, Dexter Filmore wrote:
>> > Am Dienstag, 27. Mai 2008 00:06:57 schrieb Justin Piszcz:
>> >> On Mon, 26 May 2008, Dexter Filmore wrote:
>> >>> So I have a filesystem on an array I cannot unmount, hence I cannot
>> >>> stop the array.
>> >>> Any way to force it?
>> >>>
>> >>> Dex
>> >>
>> >> What is using it?
>> >>
>> >> lsof | grep /mount_point
>> >> lsof | grep /dev/mdX
>> >
>> > A defunct java process that died from a mem heap error. I can't kill
>> the
>> > process, not even -9, leaves a <defunct>.
>>
>> Other than rebooting I am not sure..  You could try making / re-mounting
>> it as read-only but if the java process is still reading from the FS it
>> probably will not be of any help.
>>
>> Justin.
>
> Exactly. reboot pretty much deosn't do any good, afterwars the raid
> resyncs,
> which takes full 7h here.

There shouldn't be a resync.  Presumably nothing is writing to the
array, and moments after the last write, the array will have been
flagged as 'clean' and will not require a resync after a reboot.

> What happens there anyway? it resyncs, but mdstats say [UUUUU], all fine.

I don't understand this question.

NeilBrown