On Tue, 01 Nov 2011 17:53:47 -0400 Krzysztof Adamski [off-list ref] wrote:

This is my first patch, so please be gentle.

Always.

This patch adds the display of the number of hours till the completion
of resync of an array in the /proc/mdstat display.

Example: [>....................]  resync =  3.3% (98633240/2928311808)
finish=1026.1min (17h) speed=45957K/sec

Thanks.
While I can see the attraction of this I am always cautious of making
unnecessary changes to /proc/mdstat.
It is very likely that people have ad-hoc scripts and programs which parse
the output and do something with it.
While I think it is unlikely that the change you have suggested will break
any such script, I cannot be at all sure that it won't break one.
And I really don't like breaking things.

There certainly is value in having a way to see at a glance the over-all
status of md.  Currently that is
    watch cat /proc/mdstat
(I run that whenever I am testing).
However if we want to improve it, I think it would be best to write a
separate program that gathers data from there /proc/mdstat
and/or /sys/block/md*/md/  and presents nicely-formatted output.

mdtop??

Thanks,
NeilBrown