>> 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? The former: it reads all data and verifies the parity. It's a bit hard to see buried in drivers/md/raid5.c:handle_stripe5(), which is more than a little intricate. If you search for MD_RECOVERY_CHECK in there, you can see where it rewrites the newly added disk if syncing or just notes the problem if checking. - 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
