Date: Fri, 15 Nov 2002 13:36:18 -0500 From: "Roy Hooper" <rhooper@cyberus.ca> To: <doc@FreeBSD.org> Subject: ATA RAID rebuild steps Message-ID: <01ef01c28cd5$e33eedb0$c701140a@intranet.comnet.ca>
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These notes are accurate for the HighPoint ATA controller with hot-swap
capable enclosures:
I am passing them on for potential inclusion in the handbook.
How to Rebuild ATA RAID1
FreeBSD allows you to hot-replace a failed disk in an array. This requires
you catch it before you reboot.
You will probably see something like the following in the syslog/dmesg
output.
ad6 on monster1 suffered a hard error.
ad6: READ command timeout tag=0 serv=0 - resetting
ad6: trying fallback to PIO mode
ata3: resetting devices .. done
ad6: hard error reading fsbn 1116119 of 0-7 (ad6 bn 1116119; cn 1107 tn 4
sn 11) status=59 error=40
ar0: WARNING - mirror lost
Do a quick check to see how things are doing.
# atacontrol list
ATA channel 0:
Master: no device present
Slave: acd0 <HL-DT-ST CD-ROM GCR-8520B/1.00> ATA/ATAPI rev 0
ATA channel 1:
Master: no device present
Slave: no device present
ATA channel 2:
Master: ad4 <MAXTOR 6L080J4/A93.0500> ATA/ATAPI rev 5
Slave: no device present
ATA channel 3:
Master: ad6 <MAXTOR 6L080J4/A93.0500> ATA/ATAPI rev 5
Slave: no device present
# atacontrol status ar0
ar0: ATA RAID1 subdisks: ad4 ad6 status: DEGRADED
1) You will first need to detach the disk from the array so that you can
safely remove it:
# atacontrol detach 3
2) Replace the disk.
3) Reattach the disk as a spare
# atacontrol attach 3
Master: ad6 <MAXTOR 6L080J4/A93.0500> ATA/ATAPI rev 5
Slave: no device present
- Rebuild the array
# atacontrol rebuild ar0
- The rebuild command hangs until complete, so start another window
- Check on the progress:
- # dmesg | tail -10
[snip]
ad6: removed from configuration
ad6: deleted from ar0 disk1
ad6: inserted into ar0 disk1 as spare
# atacontrol status ar0
ar0: ATA RAID1 subdisks: ad4 ad6 status: REBUILDING 0% completed
- Wait till completed
--
Roy Hooper
Sr. System Administrator
Cyberus Online Inc.
http://www.cyberus.ca/
(613) 233-5555
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