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====Convert Software RAID1 to RAID5====
====Convert Software RAID1 to RAID5====
Note: these instructions are only applicable if you have SME8 and a RAID1 system with 2 hd in sync; new drive(s) must be of the same size or larger as the current drive(s)
{{Note box|msg=these instructions are only applicable if you have SME8 and a RAID1 system with 2 hd in sync; new drive(s) must be of the same size or larger as the current drive(s)}}
{{Warning box|msg=Please make a full backup before proceeding}}
<ol></li><li>Login as root
</li><li>Move to /boot (we must create a new initrd image to load raid5 driver).
Login as root
Move to /boot (we must create a new initrd image to load raid5 driver).
cd /boot
cd /boot
Make a backup copy
</li><li>Make a backup copy
mv initrd-`uname -r`.img initrd-`uname -r`.img.old
mv initrd-`uname -r`.img initrd-`uname -r`.img.old
Create the new image
</li><li>Create the new image
mkinitrd --preload raid5 initrd-`uname -r`.img `uname -r`
mkinitrd --preload raid5 initrd-`uname -r`.img `uname -r`
Shut down and install new drive(s) in system.
</li><li>Shut down and install new drive(s) in system.
Boot up with SME cd and enter the rescue mode.
</li><li>Boot up with SME cd and enter the rescue mode.
sme rescue
sme rescue
Skip network setup.
</li><li>Skip network setup.
Skip mounting the current SME installation.
</li><li>Skip mounting the current SME installation.
Now, create on the new drive(s) the correct partition table.
</li><li>Now, create on the new drive(s) the correct partition table.
sfdisk -d /dev/sda > tmp.out
sfdisk -d /dev/sda > tmp.out
sfdisk /dev/sdc < tmp.out
sfdisk /dev/sdc < tmp.out
Repeat the last step for each new hd (sdd, sde ecc.).
</li><li>Repeat the last step for each new hd (sdd, sde ecc.).
Create the new array
</li><li>Create the new array
mdadm --create /dev/md2 -c 256 --level=5 --raid-devices=2 /dev/sda2 /dev/sdb2
mdadm --create /dev/md2 -c 256 --level=5 --raid-devices=2 /dev/sda2 /dev/sdb2
mdadm: /dev/sda2 appears to be part of a raid array:
mdadm: /dev/sda2 appears to be part of a raid array:
mdadm: array /dev/md2 started.
mdadm: array /dev/md2 started.
Wait for resync; monitor the status with
</li><li>Wait for resync; monitor the status with
cat /proc/mdstat
cat /proc/mdstat
1048512 blocks level 5, 256k chunk, algorithm 2 [2/1] [U_]
1048512 blocks level 5, 256k chunk, algorithm 2 [2/1] [U_]
[==>..................] recovery = 12.5% (132096/1048512) finish=0.8min speed=18870K/sec
[==>..................] recovery = 12.5% (132096/1048512) finish=0.8min speed=18870K/sec
Reboot
</li><li>Reboot
exit
exit
Login as root
</li><li>Login as root
Add the new drives to the array
</li><li>Add the new drives to the array
mdadm --add /dev/md2 /dev/sdc2
mdadm --add /dev/md2 /dev/sdc2
Repeat the last step for each new hd (sdd2, sde2 ecc.)
</li><li>Repeat the last step for each new hd (sdd2, sde2 ecc.)
Grow the array
</li><li>Grow the array
mdadm --grow /dev/md2 --raid-devices=N
mdadm --grow /dev/md2 --raid-devices=N
N is the total number of drives: minimun is 3
</li><li>N is the total number of drives: minimum is 3
Wait for array reshaping. This part can take a substantial amount of time; monitor it with
</li><li>Wait for array reshaping. This part can take a substantial amount of time; monitor it with
cat /proc/mdstat
cat /proc/mdstat
[==>..................] reshape = 12.5% (131520/1048512) finish=2.5min speed=5978K/sec
[==>..................] reshape = 12.5% (131520/1048512) finish=2.5min speed=5978K/sec
</li><li>Issue the following commands:
Issue the following commands:
pvresize /dev/md2
pvresize /dev/md2
lvresize -l +100%FREE main/root
lvresize -l +100%FREE main/root
resize2fs /dev/main/root
resize2fs /dev/main/root
</li></ol>
Notes :
Notes :
* If you have disabled lvm
* If you have disabled lvm
# More info: http://www.arkf.net/blog/?p=47
# More info: http://www.arkf.net/blog/?p=47
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<noinclude>[[Category:Howto]][[Category:Administration:Storage]]</noinclude>
<noinclude>[[Category:Howto]][[Category:Administration:Storage]]</noinclude>
