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Raid (view source)

Revision as of 11:01, 10 August 2010

2,483 bytes added ,  11:01, 10 August 2010
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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.
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====Convert Software RAID1 to RAID5====
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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)
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* CAUTION MAKE A FULL BACKUP!
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Login as root
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Move to /boot (we must create a new initrd image to load raid5 driver).
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cd /boot
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Make a backup copy
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mv initrd-`uname -r`.img initrd-`uname -r`.img.old
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Create the new image
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mkinitrd --preload raid5 initrd-`uname -r`.img `uname -r`
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Shut down and install new drive(s) in system.
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Boot up with SME cd and enter the rescue mode.
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sme rescue
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Skip network setup.
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Skip mounting the current SME installation.
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Now, create on the new drive(s) the correct partition table.
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sfdisk -d /dev/sda > tmp.out
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sfdisk /dev/sdc < tmp.out
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Repeat the last step for each new hd (sdd, sde ecc.).
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Create the new array
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mdadm --create /dev/md2 -c 256 --level=5 --raid-devices=2 /dev/sda2 /dev/sdb2
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mdadm: /dev/sda2 appears to be part of a raid array:
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level=raid1 devices=2 ctime=Fri Dec 18 13:17:49 2009
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mdadm: /dev/sdb2 appears to be part of a raid array:
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level=raid1 devices=2 ctime=Fri Dec 18 13:17:49 2009
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Continue creating array? y
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mdadm: array /dev/md2 started.
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Wait for resync; monitor the status with
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cat /proc/mdstat
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root# cat /proc/mdstat
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Personalities : [raid0] [raid1] [raid5]
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md2 : active raid5 sdb1[2] sda1[0]
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1048512 blocks level 5, 256k chunk, algorithm 2 [2/1] [U_]
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[==>..................]  recovery = 12.5% (132096/1048512) finish=0.8min speed=18870K/sec
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Reboot
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exit
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Login as root
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Add the new drives to the array
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mdadm --add /dev/md2 /dev/sdc2
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Repeat the last step for each new hd (sdd2, sde2 ecc.)
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Grow the array
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mdadm --grow /dev/md2 --raid-devices=N
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N is the total number of drives: minimun is 3
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Wait for array reshaping. This part can take a substantial amount of time; monitor it with
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cat /proc/mdstat
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root# cat /proc/mdstat
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Personalities : [raid0] [raid1] [raid5]
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md2 : active raid5 sdc1[2] sdb1[1] sda1[0]
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1048512 blocks super 0.91 level 5, 256k chunk, algorithm 2 [3/3] [UUU]
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[==>..................]  reshape = 12.5% (131520/1048512) finish=2.5min speed=5978K/sec
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Issue the following commands:
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pvresize /dev/md2
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lvresize -l +100%FREE main/root
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resize2fs /dev/main/root 
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Notes : 
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* If you have disabled lvm 
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# you don't need the pvresize or lvresize command
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# the final line becomes resize2fs /dev/md2 (or whatever / is mounted to)
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# More info: http://www.arkf.net/blog/?p=47
    
<noinclude>[[Category:Howto]][[Category:Administration:Storage]]</noinclude>
 
<noinclude>[[Category:Howto]][[Category:Administration:Storage]]</noinclude>
Nenonano
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