Re: Soft Raid5 Problems
hi ya nik
assuming you have 4 out of 5 disks still working as sw raid5
or 3 out of 4 still working... you can rebuild your raid...
if you have 2 dead disks... your entire raid is shot...
unless you wanna go diggin into more funky recovery tools
( manually doing what e2fsck does automatically
( you're better off restoring data from backups...
if your (raid) disks shows up .... you're still okay
cat /proc/mdstats
===
=== backup your data to some other disk on your LAN
=== before attempting to fix your semi-dead sw raid5
===
if raidstart /dev/md0 fails... than you will have to manually
recreate your raid arrays
- different ways to get around different problems
( find the method that works for you )
http://www.1U-Raid5.net/Startup/Fix.Raid.mdctl.txt
http://www.1U-Raid5.net/Startup/Fix.raid.mdadm.txt
.. more ...
if you do have your raid intact... and just a dead disk
than you can take that disk out and add a new one
-- if you were manually able to recreate /dev/md0
-- backup all your data now to some other disks
-- on your lan
-- than continue fixing your raid box
raidhotremove /dev/md0 /dev/hdc1
-- power down your system ...
-- swap out the bad disks ( /dev/hdc )
-- put the new replacement disk in
-- power up as normal...
-- note that it will be running in degraded mode...
-- keep an eye on /proc/mdstat for "resync status"
when its done with its housekeeping... i'd add
the replacement disks ...
raidhotadd /dev/md0 /dev/sdc1
- watch it resync again...
and i'd power down and back up one ore time for good measure
c ya
alvin
On Thu, 25 Apr 2002, Nik Engel wrote:
> Hi !
> I have installed a softraid (Level 5 ) on my Debian Sid Box running
> Kernel 2.4.17.
> Unfortunatly one disk seems to be faulty as the system is no longer able
> to sync with that disk. But i can after stopping the raid format the
> disk etc.
>
> which tools can i use to verify the state of the disk ?
> How can i rebuild the raid ?
>
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