It should work!
I used your example, and everything worked as expected.
mdadm -C /dev/md3 -R -l5 -n4 /dev/ram0 /dev/ram1 /dev/ram2 missing
>From mdadm -D /dev/md3:
Number Major Minor RaidDevice State
0 1 0 0 active sync /dev/ram0
1 1 1 1 active sync /dev/ram1
2 1 2 2 active sync /dev/ram2
3 0 0 3 faulty
mdadm /dev/md3 -a /dev/ram3
>From mdadm -D /dev/md3:
Number Major Minor RaidDevice State
0 1 0 0 active sync /dev/ram0
1 1 1 1 active sync /dev/ram1
2 1 2 2 active sync /dev/ram2
3 0 0 3 faulty
4 1 3 4 spare rebuilding /dev/ram3
>From cat /proc/mdatat:
md3 : active raid5 [dev 01:03][4] [dev 01:02][2] [dev 01:01][1] [dev
01:00][0]
12096 blocks level 5, 64k chunk, algorithm 2 [4/3] [UUU_]
[>....................] recovery = 0.0% (620/4032) finish=8.5min
speed=4K/sec
To slow things down I had run these 2 commands:
echo 1 > /proc/sys/dev/raid/speed_limit_min
echo 2 > /proc/sys/dev/raid/speed_limit_max
Otherwise, the re-sync would complete before I had a chance to type the next
command!
Once the re-sync was done, this is the outout from mdadm -D /dev/md3:
Number Major Minor RaidDevice State
0 1 0 0 active sync /dev/ram0
1 1 1 1 active sync /dev/ram1
2 1 2 2 active sync /dev/ram2
3 1 3 3 active sync /dev/ram3
I also tried without the "-R":
mdadm -C /dev/md3 -l5 -n4 /dev/ram0 /dev/ram1 /dev/ram2 missing
I had the same results with or without "-R".
I have Kernel 2.4.28 and mdadm 1.8.0.
Guy
-----Original Message-----
From: linux-raid-owner@xxxxxxxxxxxxxxx
[mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Ferenc-Jan
Sent: Friday, January 14, 2005 3:35 PM
To: linux-raid@xxxxxxxxxxxxxxx
Subject: create raid5 with missing disk; not possible?
Hello,
I tried to create a raid5 set with 3 partitions and one missing device:
mdadm -C /dev/md1 -R -l5 -n4 /dev/hda3 /dev/hdc3 /dev/hdd3 missing
Later I want to add the fourth device with mdadm /dev/md1 -a /dev/hdb3.
But this becomes a spare and I always end up with the missing drive in
sync, mdadm -D /dev/md1:
<snip>
3 0 0 0 sync
I want to do this so I can use hdb to transfer data from an harddisk to
the raid5 set. Maybe this is only possible with Raid 1 sets?
cheers
Ferenc
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