One of the reasons I started this blog is to write about problems I’ve solved that I can’t find answers to already on the web. Today, let’s talk about moving your linux install to linux software raid (md raid / mdadm). This post assumes you are running Ubuntu Linux 8.04, but any Debian-based distro from the past two years, or most other distros, will have similar commands.
We start with an install on a single 80 GB SATA drive, partitioned as follows:
/dev/sda1 as /, 10GB, ext3, bootable
/dev/sda2 as swap, 1GB
/dev/sda3 as /home, 69GB, ext3
We want to add a second 80GB SATA drive and move the entire install to use RAID1 between the two drives. So the final configuration will appear:
/dev/md0 as /, 10GB, ext3
/dev/md1 as swap, 1GB
/dev/md2 as /home, 69GB, ext3
Where the raid arrays are:
md0 : active raid1 sda1[0] sdb1[1]
md1 : active raid1 sda2[0] sdb2[1]
md2 : active raid1 sda3[0] sdb3[1]
Here there be dragons. As always, back up your data first. If you don’t know how to use rsync, now is an excellent time to learn.
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