Re: How to do a recovery of a degraded RAID1

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I'm experiencing the same issue on a SunXfire2200 (nvraid).
BIOS seems to only change metadatasbut nothing happens then, even after keeping the computer into the BIOS for two days. Is there anyway to copy the drive with DD (from a LiveCD) and then change the metadata again to tell the controller the drives are synced ?

Hall, Eric R a écrit :
Thomas -

I hate to tell you the bad news but the BIOS/Option ROM does not complete a mirror rebuild on ISW.  The BIOS simply changes the metadata status to 'rebuilding' so that a software tool like DMRAID in Linux or iMSM in Windows can rebuild the drive.
The following link details the information about a failed RAID 1 in Windows (may not help but it will give you an idea about how the rebuild with fakeraids work)

There are no rebuild capabilities in dmraid at the moment. There is effort to have this functionality in the near future.
- Eric

-----Original Message-----
From: ataraid-list-bounces@xxxxxxxxxx [mailto:ataraid-list-
bounces@xxxxxxxxxx] On Behalf Of Thomas Schwanhäuser
Sent: Sunday, August 12, 2007 5:34 AM
To: ataraid-list@xxxxxxxxxx
Subject: How to do a recovery of a degraded RAID1

Hi all,

I currently have two servers both have been setup with a RAID1
configuration in the motherboard's BIOS. One server uses NVIDIA and the
other ISW. Both of them have a failed hard drive and I'm having
difficulties to get the replaced drive resynced.

Because both now behave in the same way, I concentrate with the following
explanation on the server using the ISW metaformat.

What I did do so far was to replace the drive, go to the RAID Bios of Intel
and set the array to be rebuild. After this, the status on each boot of the
array is "Rebuilding". However, I was not able to see any progress, even
after a week, the RAID Bios still showed the status to be "Rebuilding" on a

I found other posts on this list which say, that one has let the
motherboards BIOS let to the recovery process. So now I'm wondering how
this can be actually performed. I went to the BIOS and kept it open for
24hrs (the hard drive is 160GB big), now after a reboot, it's still
"rebuilding". However checking the content, it still looks like that
nothing happened.

Here is some debug information:

************ FDISK shows no partition table on second drive

[root@web4 ~]# fdisk -l /dev/sda

Disk /dev/sda: 164.6 GB, 164696555520 bytes
255 heads, 63 sectors/track, 20023 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

  Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       20022   160722292+  8e  Linux LVM
[root@web4 ~]# fdisk -l /dev/sdb

Disk /dev/sdb: 164.6 GB, 164696555520 bytes
255 heads, 63 sectors/track, 20023 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table


dmraid believes the set is "ok", although it should be degraded.

[root@web4 ~]# dmraid -s
*** Group superset isw_eabdhggeia
--> Subset
name   : isw_eabdhggeia_Volume0
size   : 321667072
stride : 128
type   : mirror
status : ok
subsets: 0
devs   : 2
spares : 0

[root@web4 ~]# dmraid -r
/dev/sda: isw, "isw_eabdhggeia", GROUP, ok, 321672957 sectors, data@ 0
/dev/sdb: isw, "isw_eabdhggeia", GROUP, ok, 321672957 sectors, data@ 0


The system is a Fedora 6 installation (2.6.20-1.2962.fc6) with

dmraid version:         1.0.0.rc13 (2006.10.11) debug
dmraid library version: 1.0.0.rc13 (2006.10.11)
device-mapper version:  4.11.0

My understanding from reading other posts is that there is no way at the
moment to do an "online rebuild". So if anyone has some tips for me how the
rebuild can be performed for an ISW and/or NVIDIA installation, I would
much appreciate it.

Furthermore I suggest to add a note to the manpages of dmraid a note that
online rebuilds are not yet supported.

Many thanks for your help in advance.

Best regards,


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