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Re: 10.4 cannot rebuild mirror



On 3-Mar-08, at 3:31 PM, Chris Bonner wrote:

Hi,

Our RAID mirror is showing degraded on our mail server. The diskutil
checkRAID command produces this...

RAID SETS
---------

Name:                   mirror
Unique ID:              E331DD55-91B7-11DB-92AE-000A95BEF6E4
Type:                   Mirror
Status:                 Degraded
Device Node:            disk2
Apple RAID Version:     1
----------------------------------------------------------------------
Slice   Device Node     UUID                                    Status
----------------------------------------------------------------------
1       disk0s3         716825B2-5A9F-4219-B995-4D04DE8F8746    Spare
0       disk1s4         DB08BB22-E825-41FF-9A01-D34422222892    Online
-       Unknown         FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF
Missing/Damaged
----------------------------------------------------------------------

We are running 10.4.11 on a PowerMac G5 with 2 SATA disks. We have never
had a spare before. This was a fresh install of tiger too.


When trying to rebuild the mirror with diskutil repairMirror I get...

----

Note: Syncing data between mirror partitions can take a very long time.
2008-03-03 20:27:32.795 DiskManagementTool[25644] Cannot find RAID
children, bailing.


There was an error syncing data between the master and the new mirror slice

----

I have tried this from the 'live' system and from booting the server
install CD as well. Both give the same results. Both drives will also boot
independently without the other attachted. I have also put in a new hard
disk but cannot rebuild with that either.


Any help much appreciated.
Chris.

This is a known issue.

Your RAID was created with Apple RAID version 1, probably when you were using Mac OS X 10.3.x, and you are trying to re-build it using Apple RAID version 2 which is what comes with Disk Utility in Mac OS X 10.4.x

What you'll need to do is copy the data off the version 1 RAID and rebuild the RAID using version 2. Then you can restore the data.

In your case, take the spare off-line and copy all you data to that spare drive. Rebuild the Mirror using Apple RAID version 2 and then copy the data back.

--
Gino Cerullo

Pixel Point Studios
21 Chesham Drive
Toronto, ON  M3M 1W6

416-247-7740

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