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I may have screwed up, I am not sure.
I have 5 750GB drives in a raid 5 array. The problem was that I forgot to set the part. type flag for each drive before building/adding/growing.
Only 2 of the drives had the flag set for raid. I thought if I faulted out one drive at a time I could correct this. Now I stuck.
I faulted out /dev/sda, ran cfdisk and set the flag to raid. There was no part. for the drive. I then removed /dev/sda from /dev/md0 and the added it back end. It seemed to be working and then the status kick out that /dev/sdd was set as faulty. Now --detail shows
Version : 00.90.03
Creation Time : Sun May 27 23:13:29 2007
Raid Level : raid5
Array Size : 2930297856 (2794.55 GiB 3000.63 GB)
Used Dev Size : 732574464 (698.64 GiB 750.16 GB)
Raid Devices : 5
Total Devices : 5
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Sun Feb 24 08:45:31 2008
State : clean, degraded
Active Devices : 3
Working Devices : 5
Failed Devices : 0
Spare Devices : 2