I read somewhere that each disk in a raid5 array should be master on a
separate IDE port. So, I bought a PCI IDE controller and plugged it in.
The motherboard had 4 ports already. The raid devices used hde1, hdf1, and
hdg1. Oddly, the new controller took over hd[efgh] and moved the motherboard
ports to hd[ijkl].
But anyway...how do I move the drives to different letters and then get it
to reassemble???
I moved the slave disk (hdf) over to the new controller and tried to restart
the array. But, no amount of fiddling with mdadm --assemble and mdadm.conf
would work. I didn't use --force though...thought it might be best to ask
first :-). I tried using the uuid, listing the partions in the mdadm.conf,
using --scan, etc. but it just refused to run correctly. It tried to
assemble the array from a single drive.
After plugging in the new controller and moving the slave driver over...
hdf1 became hde1
hde1 became hdi1
hdg1 became hdk1
Here's a dump from mdadm -D /dev/md0 with the array back to the original
configuration.
/dev/md0:
Version : 00.90.00
Creation Time : Sun Jul 14 21:18:51 2002
Raid Level : raid5
Array Size : 160071424 (152.66 GiB 163.91 GB)
Device Size : 80035712 (76.33 GiB 81.96 GB)
Raid Devices : 3
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Apr 9 22:04:02 2003
State : dirty, no-errors
Active Devices : 3
Working Devices : 3
Failed Devices : 1
Spare Devices : 0
Layout : left-asymmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
0 33 1 0 active sync /dev/hde1
1 33 65 1 active sync /dev/hdf1
2 34 1 2 active sync /dev/hdg1
UUID : 29abe54b:e219e78b:99662049:8e486c8f
Events : 0.92
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