[rhelv6-list] MD devices lost after boot

[Roth, Sandro]

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


Flughafen Zürich AG
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CH-8058 Zürich-Flughafen

www.flughafen-zuerich.ch



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