On Mon, Apr 28, 2014 at 7:36 PM, Marcel Duchamp <
marcel.duchamp@sbcglobal.net> wrote:

> > Yes. All software RAID mechanisms (mdadm, BTRFS, ZFS) provide "scrubbin=
g"
> > functionality. One normally runs this once a week and it makes sure tha=
t
> > all the data agrees with itself across all redundancy units in a set. I=
t
> > fixes any corruptions it finds.
>
> How long does scrubbing take on, say, a nearly full 1TB drive?
>

I haven't ever timed it since I just run it as a cron job. I would guess
maybe an hour or two. The process doesn't interfere with the operation of
the volume. It runs in the background as a low priority task, and it can be
stopped at any time. I can't even tell that it's happening; you can
literally just set it up as a cron job once and forget about it forever.

The Arch Linux wiki is the best resource for general Linux best practices
and almost always applies to all Linux distributions:
https://wiki.archlinux.org/index.php/Software_RAID_and_LVM#Scrubbing

Even after a year of always-on server heavy use, my three Seagate Barracuda
7200.14 ST1000DM003-1CH162 1TB drives in RAID 5 have a grand total of zero
data mismatches.
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