Re: mismatch_cnt again

[Goswin von Brederlow <goswin-v-b@web.de>]

Neil Brown <neilb@suse.de> writes:

> On Mon, 16 Nov 2009 15:36:55 -0600
> greg@enjellic.com wrote:
>
>> If a scrub directive were to be implemented it would be beneficial to
>> make it interruptible.  A 'halt' or similar directive would shutdown
>> the scrub and latch the last block number which had been examined.
>> That would allow a scrub to be resumed from that point in a subsequent
>> session.
>> 
>> With some of these large block devices it is difficult to get through
>> an entire 'check/scrub' in whatever late night window is left after
>> backups have run.  The above infra-structure would allow userspace to
>> gate the checking into whatever windows are available for these types
>> of activities.
>
> This is already possible with check.
>
> If you write 'idle' to 'sync_action', the check will stop.
> If you first read from 'sync_completed' and store that value,
> then before starting a new 'check', write the value to
> sync_max, then you get exactly what you are asking for, all
> easily done in a shell script.
> You can also set 'sync_max' if you like, thus you could e.g.
> quite easily have a cron job that scrubs 1/28th of the array each
> night based on the day of the month.
>
> NeilBrown

Great. I was looking for that feature too.

MfG
        Goswin