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2011-03-06: added a warning box to RAID1 -> RAID5 conversion: note taken from http://www.arkf.net/blog/?p=47
2011-03-06: added a warning box to RAID1 -> RAID5 conversion: note taken from http://www.arkf.net/blog/?p=47
[[User:Stephdl|Stephdl]] ([[User talk:Stephdl|talk]]) 05:50, 4 February 2013 (MST) i need your help for correcting my english grammar, please be indulgent...
i have tested all the command in a virtualbox, it works as expected.
====Adding another Hard Drive Later (Raid 1 array only)====
ENSURE THAT THE NEW DRIVE IS THE SAME SIZE OR LARGER AS THE CURRENT DRIVE(S)
* Shut down the machine
* Install drive as master on the second IDE channel (hdc)
* Boot up
* Log on as admin to get to the admin console
* Go to #5 Manage disk redundancy
It should tell you there if the drives are syncing up. Don't turn off the server until the sync is complete or it will start from the beginning again. When it is done syncing it will show a good working raid1.
If the Manage disk redundancy page gives the message "The free disk count must equal one" and "Manual intervention may be required", then you likely will have additional hard drives that need to be disconnected while the RAID is set up. An external USB drive will have this effect, and should be unplugged.
{{Note box| the addition of another drive is restricted to a RAID 1 degraded, i.e. when the system has been installed with a single drive (/dev/hda and /dev/hdc or their SATA equivalent). The addition of a third drive to a RAID 1 '''(i.e. a spare)''' is not recognized by the system. therefore you need to use the '''mdadm''' command line}}
I suppose the system is installed with a Raid1 functional on two disk sda and sdb and you want to add another disk sdc as a spare (for use automatically if one disk of the array will fail)
first we need to give to sdc the same table of partition as sda or sdb
sfdisk -d /dev/sda > sfdisk_sda.output
sfdisk /dev/sdc < sfdisk_sda.output
then we need to add the news partitions to the existings arrays
mdadm --add /dev/md1 /dev/sdc1
mdadm --add /dev/md2 /dev/sdc2
to verify, you can see the return of commands below
mdadm --detail /dev/md1
mdadm --detail /dev/md2
/dev/md1:
Version : 0.90
Creation Time : Sat Feb 2 22:24:38 2013
Raid Level : raid1
Array Size : 104320 (101.89 MiB 106.82 MB)
Used Dev Size : 104320 (101.89 MiB 106.82 MB)
Raid Devices : 2
Total Devices : 3
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Mon Feb 4 13:28:43 2013
State : clean
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
UUID : f97a86c5:8bb46daa:6854855e:558a3e16
Events : 0.6
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 - spare /dev/sdc1
else you can try this.
cat /proc/mdstat
cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdc1[2](S) sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
md2 : active raid1 sdc2[2](S) sdb2[1] sda2[0]
52323584 blocks [2/2] [UU]
(S)= Slave
(F)= Fail
[0]= number of the disk