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Old 24th April 2007, 06:32 AM
yagerd001 Offline
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Join Date: Aug 2006
Posts: 3
Failed raid 01 - mdadm

Horrors. I setup a raid using /dev/sda and /dev/sdb. Within a couple of weeks, sdb failed with a repetitive clicking sound. I immediately turned off my computer and shipped the thing back to Seagate, and they sent me a replacement. Now when I print the partition table for sda using fdisk, it says:

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Evidently I didn't follow the procedure to "fail" the bad drive, and now I can't figure out how to retrieve the information on the good drive, /dev/sda.

Anyone help me out of this jam?

Oddly enough, the replacement disc shows that it's already partitioned.


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Old 24th April 2007, 03:01 PM
Posts: n/a
You should be able to fix this in four steps:

first guest partition to see what it thought was really there by issuing this command

eqgpart /dev/hdc

Secondly save the MBR and the partition table

dd if=/dev/hdc of=mbr bs=512 count=1

Third, use gpart and tell it that you have faith in what it
believed was in the first partition, and for it to re-create the
partition table

gpart -W /dev/hdc /dev/hdc

Fourth reboot after running gpart.

This should help
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Old 25th April 2007, 07:11 PM
yagerd001 Offline
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Join Date: Aug 2006
Posts: 3
Gparted shows that /dev/sda is unallocated. It does give me the option of assigning a disk label. If I assign a disk label, will that damage any contents that still might be there?
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Old 25th April 2007, 07:35 PM
Flyboy917 Offline
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Join Date: Jan 2005
Location: Wichita, KS
Posts: 373
I dissagree on this. There are specific tools/ in md or mdadm used to rebuild a failed drive in an array. Unfortunatly, I can't tell you what they are because its been such a long since I set up my raid. When I did originally set it up, I intentionally "failed" a drive just to test my ability to restore it. It was simple a simple command line if I recall. Be carefull with gpart.

here is a start:

Last edited by Flyboy917; 25th April 2007 at 07:39 PM. Reason: add link
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failed, mdadm, raid

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