Help with ES v3 Raid1 (Mirror)

[Cleber P. de Souza]

Ryan,

Recreate the initrd using mkinitrd is only needed when you are
bootting your / because raid1 must be loaded into kernel to know how
to mount raid1 partitions.
To boot other partitions as /boot /home and others created partitions
the raid1 module could be loaded as module using insmod.
In your command I also added --preload=raid --with=raid1 to specify
that I want create initrd with raid1 support into kernel.

On 2/2/06, Ryan Enge <renge at uvic.ca> wrote:
> Hi Marc,
>
> The reason your software RAID is not starting automatically on boot is
> because you need to remake your initrd image. I have had this same issue
> before and it is easy to fix. From the title of your post I assume you
> are running RHEL ES v3. With your software RAID running (i.e. "cat
> /proc/mdstat" shows md0) run this command as root:
>
> mkinitrd -f "/boot/initrd-`uname -r`.img" "`uname -r`"
>
> This will recreate the initrd image and will allow software RAID 1 to
> start on boot. Then you can remove the:
>
> mdadm --assemble --scan /dev/md0
> mount -t ext3 /dev/md0 /home/apps
>
> from rc.local and remove the noauto from the fstab.
>
> --
> Ryan Enge
> System Administrator
> University of Victoria
> Room: CLE D046 Phone: 472-5447
> Email: renge at uvic.ca
>
> Thanks this solved things. Here is my recap. It seems that I was chasing
> "witch came first, the chicken or the egg". I will try to explain as
> best as I can.
>
> When running the procedure in previous posts, it would get me to work
> only after creating the /dev/md0 device, witch I could mount and use
> till I re-booted.
>
> Now, the interesting part.
> while trying to run mdadm --detail --scan > /etc/mdadm.conf would fail
> because mdadm was not started. So no config file no start. I rebuilt the
> device, but before re-booting I ran the command and it populated the
> mdadm.conf file except for my DEVICE /dev/sdb1 /dev/sdc1 Line. I guess
> that after building md0 with mdadm, it actually starts mdadm. This
> explains why it only worked after a new build of md0. So now I have the
> mdadm.conf file and entered the following into rc.local
>
> mdadm --assemble --scan /dev/md0
> mount -t ext3 /dev/md0 /home/apps
>
> I then got some errors at boot up because I had not set /dev/md0 in
> fstab to be noauto.
>
> All is well now. Thanks to Cleber and Eric to have the patients to stick
> with me on this long one, but not all is lost as I have learned a lot
> through this whole thing. Even after 20 years in computers (only 3 with
> Linux) we learn new stuff.
>
> Again many thanks
>
> Marc
>
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--
Cleber P. de Souza