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Old 05-30-2008, 07:24 PM   #1
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Registered: Jun 2004
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RAID Repair after renamed devices

Hello all.

Rather new to software linux raid, I have encountered my first problem. It seems simple to me on the surface, however I am not sure how to actually go about fixing the problem. To make it short, my RAID 5 array consisted of 3 devices. After popping a new HD into the computer the array is on, some of the devices were renamed(the /dev devices) and the array is no longer assembling properly. I was hoping that simply editing my mdadm.conf to represent these changes would be enough - but I guess I am not that lucky.

The basic layout of my RAID array before the problem:

/dev/md0 consisted of sdb1, sdc1, and sdd1.

After installing a new SATA drive the devices were changed, and I am not exactly sure in what order(I could use fdisk disk id's to determine this by unplugging the new hd and restoring the old setup I suppose if I need the information to reassemble it in order tho). But now I have no more sdd1. Instead one of the array elements is now sda1.

So before:
sdb1, sdc1, sdd1
sda1, sdb1, sdc1

Essentially I need to tell mdadm where that 3rd device (sdd1) went and to look at sda1 instead. However I hesitate to do anything myself like --remove and --add until I know exactly what is going on and that my data will be safe.

How do I reassemble this raid, and is there anything important I should keep in mind when fixing this?
Old 05-30-2008, 09:48 PM   #2
Registered: Jul 2004
Distribution: Debian
Posts: 34

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Try with:

mdadm -A --scan

If it does not work try with:

mdadm -A /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1
Old 05-30-2008, 10:21 PM   #3
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Thanks for the reply.

Neither of those do the trick for me though. Both options assemble the array with only sdb1 and sdc1. No sda1 yet.

Any other options?
Old 05-31-2008, 04:32 AM   #4
Registered: Jul 2004
Distribution: Debian
Posts: 34

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What's the error mesaage? And does the array work with this 2 drives (sdb1 and sdc1)? What's the output of:

mdadm -D /dev/md0

Last edited by zsolt_tuser; 05-31-2008 at 04:38 AM.


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