Re: raid and sleeping bad sectors
From: Jure Peèar <hidden>
Date: 2004-06-30 23:27:19
On Wed, 30 Jun 2004 18:44:16 -0400 "Guy" [off-list ref] wrote:
I want plan "a". I want the system to correct the bad block by re-writing it! I want the system to count the number of times blocks have been re-located by the drive. I want the system to send an alert when a limit has been reached. This limit should be before the disk runs out of spare blocks. I want the system to periodically verify all parity data and mirrors. I want the system to periodically do a surface scan (would be a side effect of verify parity).
And where do you propose the system would store all the info about badblocks? I have an old hw raid controller for my alpha box maintains a badblock table in its nvram. I guess it's a common feature in hw raid cards, since i had a whole box of disks with firmwares that reported each internal badblock relocation as scsi hardware error. Needless to say, linux sw raid freaked out on each such event. Things were very interesting untill we got firmware upgrade for those disks ... Also, at least 3ware cards do a 'nightly maintenance' of disks which i guess is something like dd if=/dev/hdX of=/dev/null ... What is holding you back to do this with a simple shell script and a cron entry? Now for cheching the parity in the raid5/6 setups, some kind of tool would be needed ... maybe some extension to mdadm? For the really paranoid people out there ... :) -- Jure Pe�ar - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html