Hi,
My system has 4 250GB hard drives:
/dev/md0 /dev/hdb1, /dev/hdg1
/dev/md1 /dev/hdc1, /dev/hde1
My data is static, so
I decided to take a single device from each raid off line and keep it safe.
This was the content of the /etc/mdadm/mdadm.conf file at that moment.
# cat mdadm.conf.6.25.2005
DEVICE /dev/hdb1 /dev/hdc1 /dev/hdg1 /dev/hde1
ARRAY /dev/md1 level=raid1 num-devices=2
UUID=19def19e:3995fe1e:5470d62a:c44b06c
devices=/dev/hdc1,/dev/hde1
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=ca17eac7:01b4ccb7:c768ca76:7b9febd
devices=/dev/hdb1,/dev/hdg1
So I edited mdadm.conf to changing num-devices=2 to num-devices=1:
A1:~# cat /etc/mdadm/mdadm.conf
DEVICE /dev/hdb1 /dev/hdc1
ARRAY /dev/md1 level=raid1 num-devices=1
UUID=19def19e:3995fe1e:5470d62a:c44b06c
devices=/dev/hdc1
ARRAY /dev/md0 level=raid1 num-devices=1
UUID=ca17eac7:01b4ccb7:c768ca76:7b9febd
devices=/dev/hdb1
And then I turned off the system, and pulled out both of the drives /dev/hdg1
and /dev/hde1.
Then I rebooted the sytem, and the system stopped during the standard boot
point where it runs fsck.ext3 on the mounted drives.
because the system was unable to start the devices /dev/md0 or /dev/md1
It refused to boot until I removed the mount points /dev/md0 and /dev/md1 from
/etc/fstab.
Now I naively thought that /dev/md0 and /dev/md1 would both start naturally,
with the new mdadm.conf and simply indicate a failed device in
cat /proc/mdstat?
That is what hardware raid does ... I think ...
Well after I commented out /dev/md* from /etc/fstab
I got the system to boot, and I ran
mdadm -A /dev/md0 /dev/hdb1
and the system said to me:
mdadm: /dev/md0 assembled from 1 drive, need all 2 to start it.
use --run to insist.
Now if I do
mmdadm -A --run /dev/md0 /dev/hdb1 then it starts.
similarly with /dev/md1.
But what can I do to restore the previous situation with the old /etc/fstab
so that I can reboot and have the system
remount itself without doing this --run by hand each time?
and also what is rhe --run needed here for??
this is the current content of
mdadm --detail --scan
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=ca17eac7:01b4ccb7:c768ca76:7b9febd
devices=/dev/hdb1
ARRAY /dev/md1 level=raid1 num-devices=2
UUID=19def19e:3995fe1e:5470d62a:c44b06c
devices=/dev/hdc1
while i had put num-devices=1 in the new mdadm.conf . Is this the problem?
I am running debian sarge
A1:~# uname -a
Linux A1 2.6.8-1-386 #1 Thu Nov 25 04:24:08 UTC 2004 i686 GNU/Linux
A1:~# mdadm -V
mdadm - v1.9.0 - 04 February 2005
also here is the output of
A1:~# mdadm -E /dev/hdb1
/dev/hdb1:
Magic : a92b4efc
Version : 00.90.00
UUID : ca17eac7:01b4ccb7:c768ca76:7b9febad
Creation Time : Mon Jan 10 13:55:58 2005
Raid Level : raid1
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0
Update Time : Sun Jun 26 01:15:21 2005
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0
Checksum : 4b3c0cec - correct
Events : 0.364978
Number Major Minor RaidDevice State
this 0 3 65 0 active sync /dev/hdb1
0 0 3 65 0 active sync /dev/hdb1
1 1 0 0 1 faulty removed
Thanks!!!
Mitchell Laks
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