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RAID Setup on SMS

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gerasimos_h
Site Admin

Joined: 09 Aug 2007
Posts: 1757
Location: Greece

Posted: Sun Jan 02, 2011 9:41 pm Post subject: RAID Setup on SMS

All the info about this how to is documented already by slackware team at
http://sms.it-ccs.com/isos/SMS-Current/README_RAID.TXT
but let's make it as simpler as we can.

Once you boot with SMS.Native.CD-Install-1.x.x.iso before you run setup
you need to partition your disk.
On this example I used

Code:

/dev/sda1   *          63    14651279     7325608+  83  Linux

/dev/sda2        14651280    16771859     1060290   82  Linux swap

1. Prepare disks for RAID 1 Array (clone /dev/sda to /dev/sdb)

Code:

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

2. Create RAID 1 Array for root partition

Code:

mdadm --create /dev/md0 --level 1 --raid-devices 2 /dev/sda1 /dev/sdb1

3. Create RAID 1 Array for swap partition

Code:

mdadm --create /dev/md1 --level 1 --raid-devices 2 /dev/sda2 /dev/sdb2

4. Setup swap area

Code:

mkswap /dev/md1

5. Create RAID 5 Array for home partition

Code:

mdadm --create /dev/md2 --level 5 --raid-devices 3 /dev/sdc /dev/sdd /dev/sde

Start setup and choose as swap partition /dev/md1, choose as root partition /dev/md0, for home /dev/md2.
Ignore partition /dev/sd[ab]1 /dev/sd[ab]2 and continue with setup.
When it's time to choose a kernel choose a generic one, since huge kernels complains with initrd images, although they may work just fine.

When setup finish don't reboot your server.

You need to chroot to your newly system

Code:

chroot /mnt

And edit /etc/lilo.conf to something like

Code:

append="root=/dev/md0"

raid-extra-boot = mbr-only

LBA32

boot = /dev/md0

prompt

timeout = 30

compact

change-rules

reset

vga = 791

image = /boot/vmlinuz

  root = /dev/md0

  label = SMS

 initrd = /boot/initrd.gz

  read-only

The most important is to create the initrd image with

Code:

mkinitrd -c -k 2.6.35.7-smp -m ext4 -f ext4 -r /dev/md0 -R

Where
-k your kernel
-m your modules (-m ext3,ext4,reiserfs you might need a controller)
-f root filesystem
-r root partition
-R add support for RAID in initrd.

SMS generic kernels have built in support for ext2 ext3 ext4 and jfs.

run lilo and ignore the warnings.
exit and reboot your server.

-Using a huge kernel-
You can use a huge kernel without an initrd.bz if you like but to recognize raid arrays at boot you need to edit /etc/rc.d/rc.S and add between udev and lvm

Code:

progressbar 10

# Re-assemble RAID volumes:

/sbin/mdadm -As

And final type to add your arrays in mdadm.conf

Code:

mdadm -Es >> /etc/mdadm.conf

-Notification of degraded arrays -
You can add in your /etc/rc.d/rc.local

Code:

/sbin/mdadm -Ff /dev/md[0-9] -i /var/run/mdadm.pid

So by adding your mail address in /etc/mdadm.conf, you will be notified when arrays get degraded.
Or you can have it all in one line

Code:

/sbin/mdadm -Ff /dev/md[0-9] -i /var/run/mdadm.pid -m root@locahost

- Video Tutorial -
______________________

You can download the video in .mkv format.
raidsetup.mkv 4.4MB

gerasimos_h
_________________
Superb! Mini Server Project Manager
http://sms.it-ccs.com

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