Am Sonntag, 17. September 2006 13:36 schrieben Sie:

quoted

On 9/17/06, Ask Bjørn Hansen [off-list ref] wrote:

quoted

quoted

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?

I'd like to add to this question -- does 'check' action on a RAID5 array
verify the accuracy of parity data, blindly read back all data, or only
verify readability of data blocks?

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