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==Raid: Manual Rebuild==
==Raid: Manual Rebuild==
{{Level|Medium}}
{{Level|Advanced}}
{{Warning box|Get it right or you will lose data. Take a backup, let the raid sync}}
Under Re-Write
Under Re-Write
SME Servers Raid Options are largely automated, if you built your system with a single hard disk, or have a hard disk failure, simply logon as ''admin'' and select ''Disk Redundancy'' to add a new drive to your RAID1 array.
SME Servers Raid Options are largely automated, if you built your system with a single hard disk, or have a hard disk failure, simply logon as ''admin'' and select ''Disk Redundancy'' to add a new drive to your RAID1 array.
== HowTo Manage/Check a RAID1 Array from the command Line ==
== HowTo: Manage/Check a RAID1 Array from the command Line ==
=== What is the Status of the Array ===
=== What is the Status of the Array ===
add_drive_to_raid: Done.
add_drive_to_raid: Done.
add_drive_to_raid: grub> quit
add_drive_to_raid: grub> quit
== HowTo: Remove a disk from the RAID1 Array from the command Line ==
=== Look at the mdstat ===
[root@ ~]# cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sdb2[1] sda2[0]
488279488 blocks [2/2] [UU]
md1 : active raid1 sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
unused devices: <none>
=== Fail and remove the disk, '''sdb''' in this case ===
[root@ ~]# mdadm --manage /dev/md2 --fail /dev/sdb2
mdadm: set /dev/sdb2 faulty in /dev/md2
[root@ ~]# mdadm --manage /dev/md2 --remove /dev/sdb2
mdadm: hot removed /dev/sdb2
[root@ ~]# mdadm --manage /dev/md1 --fail /dev/sdb1
mdadm: set /dev/sdb1 faulty in /dev/md1
[root@ ~]# mdadm --manage /dev/md1 --remove /dev/sdb1
mdadm: hot removed /dev/sdb1
=== Add the partitions back ===
[root@ ~]# mdadm --manage /dev/md1 --add /dev/sdb1
mdadm: hot added /dev/sdb1
[root@ ~]# mdadm --manage /dev/md2 --add /dev/sdb2
mdadm: hot added /dev/sdb2
===The Leadup===
===The Leadup===
To correct this, remove the disk from the array, you will need to fail it, then remove it, the repartition and add it back to the array
To correct this, remove the disk from the array, you will need to fail it, then remove it, the repartition and add it back to the array
{{Note box|I'm using sdb which was right for me, it might not be for you (if it's RAID 1, there is a 50% chance it's not !)}}
{{Note box|I'm using sdb which was right for me, it might not be for you (if it's RAID 1, there is a 50% chance it's not !)}}
===Here we go lets fix this===
===Here we go lets fix this===
====Re-Partition, first clean the old partitions====
====Re-Partition, first clean the old partitions====
Calling ioctl() to re-read partition table.
Calling ioctl() to re-read partition table.
Syncing disks.
Syncing disks.
