2014-10-06 22:59 GMT+02:00 NeilBrown [off-list ref]:

On Mon, 6 Oct 2014 15:29:13 +0200 Patrik Horník [off-list ref] wrote:

quoted

Hello,

is it possible to cancel RAID 6 array check? echo check >
/sys/block/mdX/md/sync_action apparently only pauses it and next check
continuing from saved position. (I guess /sys/block/mdX/md/sync_min)

I want to achieve two things:

- Start check from the start of the array.

- Be sure I can shutdown array without any ill effect because check
was interrupted.

I guess that position will be cleared when array is stopped and
started again, but I dont want to guess and experiment... :)

Why ever not?  Guessing and experimenting is AWESOME.  We call it "Science".
I can understand that you might not want to experiment we real data, but
creating a few loop-back devices with "losetup", forming them into an array,
and experimenting on that can be very worthwhile.

Yeah, I fully agree. I love guessing and experimenting. In this case I
will be guessing if you write it as it should be written and we will
then test it on your production data :) Do we have a deal?

Regarding loopback devices, I of course sometimes test it. If I am in
some potential trouble I usually go further and testing it on cow dm
snapshots over drives, because you never know if it will work on
devices in your state exactly same as on just created small loopback
devices. But maybe I cannot think about all the factors and the most
effective way to know is to ask.

Patrik

NeilBrown

quoted

Thanks.

Best regards,

Patrik
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