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RE: How to do a recovery of a degraded RAID1



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) http://www.intel.com/support/chipsets/imsm/sb/CS-021014.htm

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 redhat com [mailto:ataraid-list-
>bounces redhat com] On Behalf Of Thomas Schwanhäuser
>Sent: Sunday, August 12, 2007 5:34 AM
>To: ataraid-list redhat com
>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
>reboot.
>
>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,
>
>
>Thomas
>
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