Notes on RAID for Ubuntu: Difference between revisions
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Brian Wilson (talk | contribs) m New page: Shorthand notes on how to convert a new Ubuntu system to RAID 1 == Install Ubuntu Server == System has 12GB of RAM System has two 250GB drives (actually a 320 and a 250, I ignore the ex... |
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5 24GB SWAP ''won't be raided, so we will have 48GB of swap'' | 5 24GB SWAP ''won't be raided, so we will have 48GB of swap'' | ||
6 200GB /raidvar ''will be raided /var partition'' | 6 200GB /raidvar ''will be raided /var partition'' | ||
Partitions are far bigger than they need to be but the data on this system will live on an NFS server and on another RAID array to be installed later. | |||
Making the boot partitions 1 GB means in a pinch an entire copy of Linux can be installed there. | |||
Do the installation. After it's done install the package to manage raid | Do the installation. After it's done install the package to manage raid |
Revision as of 07:01, 21 January 2010
Shorthand notes on how to convert a new Ubuntu system to RAID 1
Install Ubuntu Server
System has 12GB of RAM
System has two 250GB drives (actually a 320 and a 250, I ignore the extra space for now)
During installation create 6 partitions on each drive, so that the system can be converted to RAID 1 (mirrored)
1 1GB /boot wont be raid, so we can boot! 2 10GB /raidroot where the system will be eventually 3 10GB / initial install location 4 EXT 5 24GB SWAP won't be raided, so we will have 48GB of swap 6 200GB /raidvar will be raided /var partition
Partitions are far bigger than they need to be but the data on this system will live on an NFS server and on another RAID array to be installed later. Making the boot partitions 1 GB means in a pinch an entire copy of Linux can be installed there.
Do the installation. After it's done install the package to manage raid
apt-get install mdadm
Create RAID filesystems
In /etc/raidtab
# Root partition will be here raiddev /dev/md0 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 device /dev/sda2 raid-disk 0 device /dev/sdb2 raid-disk 1 # After successfully installing a bootable copy of /dev/sda3 on /dev/md0 # uncomment this to bounce a backup copy of the root to /dev/md1 #raiddev /dev/md1 # raid-level 1 # nr-raid-disks 2 # nr-spare-disks 0 # persistent-superblock 1 # device /dev/sda3 # raid-disk 0 # device /dev/sdb3 # raid-disk 1 raiddev /dev/md2 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 device /dev/sda6 raid-disk 0 device /dev/sdb6 raid-disk 1