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| − | Please see my remarks at [[User_talk:Davidbray]] <small>— [[User:Cactus|Cactus]] ([[User talk:Cactus|talk]] | [[Special:Contributions/Cactus|contribs]]) </small> 16:48, 19 March 2010 (UTC)
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| − | Thanks Cactus - I've made some changes here so look forward to your feedback
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| − | ===HowTo: Write the GRUB boot sector===
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| − | [[User:Trex|Trex]] ([[User talk:Trex|talk]]) 00:26, 5 February 2013 (MST) Should add a note as per the comment 24 in this Bug re grub will not install on an unpartioned disk
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| − | [[User:Stephdl|Stephdl]] ([[User talk:Stephdl|talk]]) 12:24, 6 February 2013 (MST) ok i work on the howTo...work in progress, don't disturb :p
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| − | == HowTo: Remove a disk from the RAID1 Array from the command Line ==
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| − | === Look at the mdstat ===
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| − | First we must determine which drive is in default.
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| − | [root@ ~]#'''cat /proc/mdstat'''
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| − | Personalities : [raid1]
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| − | md1 : active raid1 sdb1[1] sda1[0]
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| − | 104320 blocks [2/2] [UU]
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| − | md2 : active raid1 sdb2[2](F) sda2[0]
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| − | 52323584 blocks [2/1] [U_]
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| − | unused devices: <none>
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| − | (S)= Spare
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| − | (F)= Fail
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| − | [0]= number of the disk
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| − | {{note box|As we can see the partition sdb2 is in default, we can see the flag: sdb2 [2] (F). We need to resynchronize the disk sdb to the existing array md2.}}
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| − | === Fail and remove the disk, '''sdb''' in this case ===
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| − | [root@ ~]# '''mdadm --manage /dev/md2 --fail /dev/sdb2'''
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| − | mdadm: set /dev/sdb2 faulty in /dev/md2
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| − | [root@ ~]# '''mdadm --manage /dev/md2 --remove /dev/sdb2'''
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| − | mdadm: hot removed /dev/sdb2
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| − | [root@ ~]# '''mdadm --manage /dev/md1 --fail /dev/sdb1'''
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| − | mdadm: set /dev/sdb1 faulty in /dev/md1
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| − | [root@ ~]# '''mdadm --manage /dev/md1 --remove /dev/sdb1'''
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| − | mdadm: hot removed /dev/sdb1
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| − | === Do your Disk Maintenance here ===
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| − | At this point the disk is idle.
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| − | [root@ ~]# '''cat /proc/mdstat'''
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| − | Personalities : [raid1]
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| − | md1 : active raid1 sda1[0]
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| − | 104320 blocks [2/1] [U_]
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| − | md2 : active raid1 sda2[0]
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| − | 52323584 blocks [2/1] [U_]
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| − | unused devices: <none>
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| − | {{note box|You'll have to determine if your disk can be reinstated at the array. In fact sometimes a raid can get out of sync after a power failure but also some outages times for physical disk itself. It is necessary to test the hard drive if this occurs repeatedly. For this we will use '''smartctl'''.}}
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| − | For all the details available by SMART on the disk
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| − | [root@ ~]#'''smartctl -a /dev/sdb'''
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| − | At least two types of tests are possible, short (~ 1 min) and long (~ 10 min to 90 min).
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| − | [root@ ~]#'''smartctl -t short /dev/sdb''' #short test
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| − | [root@ ~]# '''smartctl -t long /dev/sdb''' #long test
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| − | to access the results / statistics for these tests:
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| − | [root@ ~]#'''smartctl -l selftest /dev/sdb'''
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| − | {{Note box|if you need to change the disk due to physical failure found by the smartctl command, install a new disk of the same capacity (or more) and enter the following commands to recreate new partitions by copying them from healthy disk sda.}}
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| − | [root@ ~]#sfdisk -d /dev/sda > sfdisk_sda.output
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| − | [root@ ~]#sfdisk /dev/sdb < sfdisk_sda.output
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| − | If you want to reintegrate the same disk without replacing it, go to the next step.
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| − | === Add the partitions back ===
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| − | [root@ ~]# '''mdadm --manage /dev/md1 --add /dev/sdb1'''
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| − | mdadm: hot added /dev/sdb1
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| − | [root@ ~]# '''mdadm --manage /dev/md2 --add /dev/sdb2'''
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| − | mdadm: hot added /dev/sdb2
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| − | === Another Look at the mdstat ===
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| − | [root@sme8-64-dev ~]# cat /proc/mdstat
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| − | Personalities : [raid1]
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| − | md1 : active raid1 sdb1[1] sda1[0]
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| − | 104320 blocks [2/2] [UU]
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| − | md2 : active raid1 sdb2[2] sda2[0]
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| − | 52323584 blocks [2/1] [U_]
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| − | [>....................] recovery = 1.9% (1041600/52323584) finish=14.7min speed=57866K/sec
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| − | unused devices: <none>
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