xRAID disks....

DA Forsyth iwrtech at iwr.ru.ac.za
Tue Jun 10 14:33:56 UTC 2008


I've had this for a while now and have done many searches for info 
but have not yet come up with the right question, hence have not got 
the answer.

My main server has an Adaptec IDE raid card.  A couple of years ago I 
took disks that had been a mirror pair on that card out of the server 
and put them into my test server, not as a raid pair since the test 
server has no raid hardware.

During boot I see this
ad0: 19092MB <WDC WD200EB-00CPF0 06.04G06> at ata0-master UDMA66
ad1: 76319MB <WDC WD800JB-00ETA0 77.07W77> at ata0-slave UDMA66
ad2: 76319MB <WDC WD800JB-00ETA0 77.07W77> at ata1-master UDMA66
ad3: 19092MB <WDC WD200EB-00CPF0 06.04G06> at ata1-slave UDMA66
ar0: 76319MB <Adaptec HostRAID RAID1> status: BROKEN
ar0: disk0 DOWN no device found for this subdisk
ar0: disk1 DOWN no device found for this subdisk

The pair of ex-RAID disks are ad1 and ad2 and obviously are no longer 
a raid pair, yet 'something' is telling the ar() driver to try and 
pair them and failing because there is no raid hardware in that box.

Now I am reconfiguring that machine a bit and would like to fix this, 
both on these existing drives and on the 320MB drive I have just 
removed from a RAID1 pair and will be putting into the box instead of 
ad3 (the other 320GB from the pair is in a USB enclosure for other 
purposes and has not shown any signs of knowing it was in a raid 

I suspect the raidinfo is stored on the disk somewhere and a suitable 
'dd' command can erase it.  but where and how?

thanks for your help

       DA Fo rsyth            Network Supervisor
Principal Technical Officer -- Institute for Water Research

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