[rhelv6-list] Antwort: MD devices lost after boot

[Andreas Reschke]

rhelv6-list-bounces at redhat.com schrieb am 27.09.2012 09:05:35:

> "Roth, Sandro" <Sandro.Roth at zurich-airport.com> 
> Gesendet von: rhelv6-list-bounces at redhat.com
> 
> 27.09.2012 09:09
> 
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> [rhelv6-list] MD devices lost after boot
> 
> Hi experts
> 
> I wasn’t sure where to post this so I’m sending it to this list.
> 
> We have a setup which uses lvm over md over multipath devices. (at 
> least that’s the plan)
> According to this article it is supported in RHEL6 (it wasn’t in RHEL5)
> https://access.redhat.com/knowledge/solutions/48634
> 
> I created my md device as follows
> # mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/
> mapper/mpatha /dev/mapper/mpathb
> 
> /etc/mdadm.conf has the following content
> DEVICE /dev/mapper/mpath*
> ARRAY /dev/md/0 metadata=1.2 UUID=52bd4011:f61badd6:0e63e7bb:
> 2448596b name=spch9003.zrh.local:0
> 
> Then some lvm stuff on /dev/md0. Everything works fine.
> But after a reboot the md device won’t get assembled automatically.
> 
> /proc/mdstat shows
> Personalities :
> unused devices: <none>
> 
> And therefore nothing gets mounted either, obviously. 
> I have to
> 
> # mdadm -As
> mdadm: /dev/md/0 has been started with 2 drives.
> # vgchange -ay datavg1
>   1 logical volume(s) in volume group "datavg1" now active
> # mount /data
> 
> I’ve done my part of googleing and a lot of people suggest creating 
> a new initrd when everything is running.
> So I went…
> 
> # dracut –f
> # init 6
> 
> No change, still won’t get assembled.
> Any ideas? I’m sure I’m just missing a configuration step..
> 
> # uname -r; rpm -q mdadm
> 2.6.32-279.5.1.el6.x86_64
> mdadm-3.2.3-9.el6.x86_64
> 
> 
> Any help would be appreciated.
> 
> 
> Regards
> 
> 
> Sandro Roth 
> 
> Systems Engineer 
> 
> IT-Operations 
> 
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Hi Sandro,
I was in the same situation, so I create this script:

[root at bgstorals01 ~]# cat /etc/init.d/raid-setup 
#!/bin/bash    
#   
# chkconfig: 2345 07 86    
# description: Start the raid0 with mdadm
# processname: -
# pidfile: -
# config: /etc/mdadm.conf

# source function library
. /etc/init.d/functions

RETVAL=0

start() {
        action $"Starting raid arrays via mdadm: " /sbin/mdadm.static 
--assemble --scan
        action $"Setting up Logical Volume Management:" /sbin/lvm.static 
vgchange -a y --ignorelockingfailure
        for fs in `grep noauto /etc/fstab | awk '{ print $2; }'`
        #for fs in `grep noauto /etc/fstab | cut -d\  -f1`
        do
                action $"Mount filesystem $fs:" /bin/mount $fs
        done
        touch /var/lock/subsys/raid-start
}

stop() {
        rm -f /var/lock/subsys/raid-start
}

case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart|reload)
        stop
        start
        ;;
  condrestart)
        if [ -f /var/lock/subsys/raid-start ]; then
            stop
            start
        fi
        ;;
  status)
        status raid-start
        RETVAL=$?
        ;;
  *)
        echo $"Usage: $0 {start|stop|restart|condrestart|status}"
        exit 1
esac

exit $RETVAL

[root at bgstorals01 ~]#

and take this script in the adequate runlevel BEFORE S15mdmonitor and 
S15mdmpd is starting.

[root at bgstorals01 ~]# ls -l /etc/rc3.d/ | grep raid
lrwxrwxrwx 1 root root 20 May 30 07:39 S07raid-setup -> 
../init.d/raid-setup
[root at bgstorals01 ~]# ls -l /etc/rc5.d/ | grep raid
lrwxrwxrwx 1 root root 20 May 30 07:39 S07raid-setup -> 
../init.d/raid-setup
[root at bgstorals01 ~]#
 
 
Mit freundlichen Grüßen
Andreas Reschke
________________________________________________________________

Unix/Linux-Administration
Andreas.Reschke at behrgroup.com
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