Hi Neil,
I've tested with the following script grow with "--assume-clean" in a
loop. The first grow succeeds - following grows fail - mdadm 3.2.5,
kernel 3.4.10.
#!/bin/bash
FIRST="/dev/sda"
SECON="/dev/sdd"
MDDEV="/dev/md0"
SIZE=1
mdadm --zero-superblock $FIRST
mdadm --zero-superblock $SECON
echo y | mdadm -C $MDDEV -e 1.2 \
--assume-clean -z "${SIZE}G" --force -l 1 -n 2 $FIRST $SECON
sleep 3
mdadm -S $MDDEV
for ((i=0; i<4; i++)); do
mdadm -A $MDDEV $FIRST $SECON
let "SIZE++"
mdadm -G $MDDEV -z ${SIZE}G --assume-clean
cat /proc/mdstat
# mdadm -D $MDDEV > /dev/null
mdadm -S $MDDEV
done
Output looks like this:
mdadm: /dev/md0 has been started with 2 drives.
mdadm: component size of /dev/md0 has been set to 2097152K
Personalities : [raid1]
md0 : active raid1 sda[0] sdd[1]
2097152 blocks super 1.2 [2/2] [UU]
unused devices: <none>
mdadm: stopped /dev/md0
mdadm: /dev/md0 has been started with 2 drives.
mdadm: /dev/md0 is performing resync/recovery and cannot be reshaped
Personalities : [raid1]
md0 : active raid1 sda[0] sdd[1]
2097152 blocks super 1.2 [2/2] [UU]
[==========>..........] resync = 50.0% (1050624/2097152)
finish=8.4min speed=2048K/sec
Now the output with "Detail"-Mode after resize:
mdadm: /dev/md0 has been started with 2 drives.
mdadm: component size of /dev/md0 has been set to 2097152K
Personalities : [raid1]
md0 : active raid1 sda[0] sdd[1]
2097152 blocks super 1.2 [2/2] [UU]
unused devices: <none>
mdadm: stopped /dev/md0
mdadm: /dev/md0 has been started with 2 drives.
mdadm: component size of /dev/md0 has been set to 3145728K
Personalities : [raid1]
md0 : active raid1 sda[0] sdd[1]
3145728 blocks super 1.2 [2/2] [UU]
This one works. Is this wanted behaviour?
Cheers,
Sebastian
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