Adding Software Raid1 to a Proxmox VE 1.9 install

This assumes you got 2 similar HDDs already setup in a server and that you know how to install ProxMoxVE (just plop the CD in the tray and blindly follow the prompts).

Install Proxmox as usual onto 1 drive(/dev/sda)

Addextra packages

mdadm will ask which MD arrays are needed for the root fs. Go with the default (all)

apt-get install mdadm initramfs-tools vim

Add raid1 to /etc/modules

echo "raid1" >> /etc/modules

Regenerate initrd.img file

mkinitramfs -o /boot/test -r /dev/mapper/pve-root

Rename old img file (replace .x for whatever kernel version you are using)

mv /boot/initrd.img-2.6.x-pve /boot/initrd.img-2.6.x-pve.original

Rename new img file

mv /boot/test /boot/initrd.img-2.6.x-pve

Make sure grub is setup on both hdds

grub-install --no-floppy /dev/sda

grub-install --no-floppy /dev/sdb

Change UUIDs for proper md0 devices on /etc/fstab if your file has the UUID in it.

Now do the same thing for the /etc/fstab file.

Replace the UUID=XXXXXXXXX /boot ext3 defaults 0 1 line with /dev/md0 /boot ext3 defaults 0 1

vim /etc/fstab

Clone the partition table from 1st drive to 2nd

sfdisk -d /dev/sda | sfdisk --force /dev/sdb

Create md devices with second drive only

mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb1

mdadm --create /dev/md1 --level=1 --raid-devices=2 missing /dev/sdb2

Save new mdconf file

mdadm --detail --scan >> /etc/mdadm/mdadm.conf

Get boot device setup

mkfs.ext3 /dev/md0

mkdir /mnt/md0

mount /dev/md0 /mnt/md0

cp -ax /boot/* /mnt/md0

umount /mnt/md0

umount /boot; mount /dev/md0 /boot

sfdisk --change-id /dev/sda 1 fd

mdadm --add /dev/md0 /dev/sda1

Setup data device

pvcreate /dev/md1

vgextend pve /dev/md1

this step takes a LOOOOONG time but if it works you know you have a good drive!

pvmove /dev/sda2 /dev/md1

vgreduce pve /dev/sda2

sfdisk --change-id /dev/sda 2 fd

mdadm --add /dev/md1 /dev/sda2

You can monitor the array rebuild progress with the following command:

watch -n 1 cat /proc/mdstat

If for some reason mdstat reports that the raid will take days to complete, you can adjust the minimal raid rebuild rate with the following command:

echo 60000 >/proc/sys/dev/raid/speed_limit_min

The default setting of 1000 may be too slow on most situations. Again, upping this too much on a system that is in use is not advisable. Also make sure you don't put the value higher than /proc/sys/dev/raid/speed_limit_max.

This was originally from the link below which helped us out when needing to install proxmox ve with mirrored drives for a customer.

I originally found this post here http://www.petercarrero.com/content/2010/07/31/adding-software-raid-proxmox-ve-install

The site went down and I saved a copy for myself to use. The site came backup a few months later and now the original post is back online. I have to say I used this many times Thank you!

  • 4 Users Found This Useful
Was this answer helpful?

Related Articles

Live Migration Virtuozzo to SolusVM

Live Virtuozzo Migrations to SolusVM From the First Host box do the following (I always check to...