kern/110960: Intel MatrixRAI (ICH8) RAID 5 rebuild does not work

Alex Wang alex at alexwang.com
Wed Mar 28 07:30:04 UTC 2007


>Number:         110960
>Category:       kern
>Synopsis:       Intel MatrixRAI (ICH8) RAID 5 rebuild does not work
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Mar 28 07:30:04 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Alex Wang
>Release:        6.2 Release
>Organization:
Synology
>Environment:
FreeBSD 6.2, i386

CPU: Intel Core2 Duo
RAM: 2GB
Motherboard: ASUS P5B-E
1 x Seagate 80GB disk
4 x WD 160 GB (WD1600AAJS)

>Description:
2 problems here:
1. Rebuild ICH8 RAID 5, the progress is always 0% and the partition can't be use any more.
2. A degrade RAID 5 can't boot. System hangs at boot time.

CPU: Intel Core2 Duo
RAM: 2GB
Motherboard: ASUS P5B-E
1 x Seagate 80GB disk
4 x WD 160 GB (WD1600AAJS)

ASUS P5B-E has intel matrix raid support. I am using 4 WD disks to build RAID 5. It works well on FreeBSD 6.2. The kernel can detect 4 disks and have a ar0 RAID 5 device.

"atacontrol status ar0" works well, I can see RAID is READY or DEGRADE when I unplug a disk.

But when I attache a new disk, add it as spare disk, then use atacontrol to rebuild to RAID, the progress is always 0%. And, the partition can't be access any more. If i try to access the partition, system hangs.

Any other problem is, if I shutdown the PC and unplug 1 disk from the 4 disks RAID 5, turn on power, the system can't boot. It hangs in detect ata raid.



>How-To-Repeat:
1. Use Intel ICH8 chip and create RAID 5
2. Unplug 1 disk
3. attache disk, add to spare disk, and rebuild
4. progress is always 0%

5. unplug the new disk
6, reboot
7, system hangs when detecting ata raid

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:


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