Converting RAID to LVM-on-RAID

OUT OF DATE as of 2008-11-01.

We decided to convert the Raid1 array to LVM instead of a monolithic partition. This will make life easier.

Commands:

1. pvcreate /dev/md0
   makes a physical volume out of the RAID array device
2. vgcreate VolGroup01 /dev/md0
   creates a new volume group to which we can add logical volumes
3. Use Redhat Logical Volume Management tool to create partitions on the new device
• /docs (5 gigs)
• /home (50 gigs)
• /etc/secret (10 gigs)
• /data (399 gigs)
4. Modified /etc/exports on Algol to export the new partitions
5. Modified /etc/fstab on the client computers to use the new partitions

• mkdir /docs
• mkdir /data
• added lines to /etc/fstab:
  algol:/data /data nfs defaults 1 1
  algol:/docs /docs nfs defaults 1 1

1. Un-tarred the backups from /bkup, which I created with the command:
   cd /bkup & tar -czvpf home.tgz /home
2. Untar by going to desired directory and running:
   tar -xzvpf /bkup/secret.tgz
   Both of these commands put the directory INTO the desired directory. Once unpacked, it’s necessary to move the contents to the proper location.
3. Modified /etc/cron.weekly/quotacheck.cron to be:
   #!/bin/bash
   # Update the database that keeps track of quotas
   # Created by Mark Knight (4.13.06)
   # Modified by Mark Knight (5.06.06)
   quotaoff -a
   quotacheck -agum
   quotaon -a

   exit 0

4. Also, had to modify /etc/fstab to add quotas back on to the new mount line for /home

All in all, not that hard. The permissions are all correct, so hopefully this was just as easy & painless as I think it was.