On 9/17/06, Dexter Filmore <[EMAIL PROTECTED]> wrote:
> > > It's recommended to use a script to scrub the raid device regularly,
> > > to detect sleeping bad blocks early.
> >
> > What's the best way to do that? dd the full md device to /dev/null?
>
> echo check >/sys/block/md?/md/sync_action
>
> Distros may have cron scripts to do this "right".
>
> And you need a fairly recent kernel.
Does this test stress the discs a lot, like a resync?
How long does it take?
Can I use it on a mounted array?
yup.
long. think resync.
yup.
It's practically "read everything, verify checksum, report bad blocks
or inconsistencies".
echo repair>sync_action causes md to fix redundancy blocks if they're
out of sync (but at that point you already have another problem like
flakey hardware or so)
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