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==Raid: Manual Rebuild==
==Raid: Manual Rebuild==
{{Level|Medium}}
{{Level|Medium}}
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.
== HowTo Manage/Check a RAID1 Array from the command Line ==
=== Are the Disk Partitioned Correctly ? ===
Here two disks are partitioned identically
[root@ ~]# '''fdisk -lu /dev/sda; fdisk -lu /dev/sdb'''
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 63 208844 104391 fd Linux raid autodetect
/dev/sda2 208845 1953520064 976655610 fd Linux raid autodetect
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 63 208844 104391 fd Linux raid autodetect
/dev/sdb2 208845 1953520064 976655610 fd Linux raid autodetect
==== Example : Incorrecty Partitioned 2nd Disk ====
[root@ ~]# '''fdisk -l /dev/sdb; fdisk -lu /dev/sdb'''
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 13 104384+ fd Linux raid autodetect
'''Partition 1 does not end on cylinder boundary.'''
/dev/sdb2 13 121601 976655647 fd Linux raid autodetect
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 208769 104384+ fd Linux raid autodetect
'''Partition 1 does not end on cylinder boundary.'''
/dev/sdb2 208770 1953520063 976655647 fd Linux raid autodetect
===The Leadup===
===The Leadup===
and a look from fdisks view shows
and a look from fdisks view shows
Note the correct partitioning on sda
Note the correct partitioning on sda
Syncing disks.
Syncing disks.
====Add the partitions back====
====Add the partitions back====
