Subject: dealing with a RAID1 failure
To: None <>
From: Steven M. Bellovin <>
List: netbsd-users
Date: 08/08/2005 21:12:23
raidctl is indicating that one of my RAID1 partitions has failed.  What 
do I do to reconstruct it?

# raidctl -s raid0       
           /dev/wd0a: failed
           /dev/wd1a: optimal
No spares.
/dev/wd0a status is: failed.  Skipping label.
Component label for /dev/wd1a:
   Row: 0, Column: 1, Num Rows: 1, Num Columns: 2
   Version: 2, Serial Number: 200209230, Mod Counter: 806
   Clean: No, Status: 0
   sectPerSU: 128, SUsPerPU: 1, SUsPerRU: 1
   Queue size: 100, blocksize: 512, numBlocks: 829440
   RAID Level: 1
   Autoconfig: Yes
   Root partition: Yes
   Last configured as: raid0
Parity status: DIRTY
Reconstruction is 100% complete.
Parity Re-write is 100% complete.
Copyback is 100% complete.

I *think* I say

	raidctl -R wd0a radid0

I doubt that it's a hardware problem, since the other partition on that 
mirrored pair of drives is working properly.  

If it matters, I'm running 2.0.

		--Steven M. Bellovin,