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Also check your driver cards, since a faulty card can destroy the data on a full RAID set as easily as it can a single disk.
Also check your driver cards, since a faulty card can destroy the data on a full RAID set as easily as it can a single disk.
====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)
* CAUTION MAKE A FULL BACKUP!
Login as root
Move to /boot (we must create a new initrd image to load raid5 driver).
cd /boot
Make a backup copy
mv initrd-`uname -r`.img initrd-`uname -r`.img.old
Create the new image
mkinitrd --preload raid5 initrd-`uname -r`.img `uname -r`
Shut down and install new drive(s) in system.
Boot up with SME cd and enter the rescue mode.
sme rescue
Skip network setup.
Skip mounting the current SME installation.
Now, create on the new drive(s) the correct partition table.
sfdisk -d /dev/sda > tmp.out
sfdisk /dev/sdc < tmp.out
Repeat the last step for each new hd (sdd, sde ecc.).
Create the new array
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:
level=raid1 devices=2 ctime=Fri Dec 18 13:17:49 2009
mdadm: /dev/sdb2 appears to be part of a raid array:
level=raid1 devices=2 ctime=Fri Dec 18 13:17:49 2009
Continue creating array? y
mdadm: array /dev/md2 started.
Wait for resync; monitor the status with
cat /proc/mdstat
root# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid5]
md2 : active raid5 sdb1[2] sda1[0]
1048512 blocks level 5, 256k chunk, algorithm 2 [2/1] [U_]
[==>..................] recovery = 12.5% (132096/1048512) finish=0.8min speed=18870K/sec
Reboot
exit
Login as root
Add the new drives to the array
mdadm --add /dev/md2 /dev/sdc2
Repeat the last step for each new hd (sdd2, sde2 ecc.)
Grow the array
mdadm --grow /dev/md2 --raid-devices=N
N is the total number of drives: minimun is 3
Wait for array reshaping. This part can take a substantial amount of time; monitor it with
cat /proc/mdstat
root# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid5]
md2 : active raid5 sdc1[2] sdb1[1] sda1[0]
1048512 blocks super 0.91 level 5, 256k chunk, algorithm 2 [3/3] [UUU]
[==>..................] reshape = 12.5% (131520/1048512) finish=2.5min speed=5978K/sec
Issue the following commands:
pvresize /dev/md2
lvresize -l +100%FREE main/root
resize2fs /dev/main/root
Notes :
* If you have disabled lvm
# you don't need the pvresize or lvresize command
# the final line becomes resize2fs /dev/md2 (or whatever / is mounted to)
# More info: http://www.arkf.net/blog/?p=47
<noinclude>[[Category:Howto]][[Category:Administration:Storage]]</noinclude>
<noinclude>[[Category:Howto]][[Category:Administration:Storage]]</noinclude>