On 9/17/06, Dexter Filmore <Dexter.Filmore@xxxxxx> 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) - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
