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4-28 Configuring Your Server
Reconstruction
The reconstruction feature is used to change configuration and/or RAID level of existing virtual disk. The Reconstruction
contains the following three features, however, the Internal RAID Controller supports "Migration with addition" only.
IMPORTANT:
You can use WebBIOS for Reconstruction. Universal RAID Utility does not
support Reconstruction.
Removed physical drive
Unsupported.
Migration only
Unsupported.
Migration with addition
Use this feature to add HDDs to existing virtual disk. The execution patterns are as shown below ( α : Number of HDDs to be
added).
Before execution After execution
RAID
level Number of
HDDs RAID
level
Number of HDDs
Description
RAID0 x RAID0 x+
α
Capacity increased: equivalent to
α
HDDs
RAID0 1 RAID1 2 Capacity remains unchanged.
RAID0 x RAID5 x+
α
Capacity increased: equivalent to
α
-1 HDDs
RAID0 x RAID6 x+
α
(
α
=2 or more) Capacity increased: equivalent to
α
-2 HDDs
RAID1 2 RAID0 2+
α
Capacity increased: equivalent to
α
+1 HDDs
RAID1 2 RAID5 2+
α
Capacity increased: equivalent to
α
HDDs
RAID1 2 RAID6 2+
α
Capacity increased: equivalent to
α
-1 HDDs
RAID5 x RAID0 x+
α
Capacity increased: equivalent to
α
+1 HDDs
RAID5 x RAID5 x+
α
Capacity increased: equivalent to
α
HDDs
RAID5 x RAID6 x+
α
Capacity increased: equivalent to
α
-1 HDDs
RAID6 x RAID0 x+
α
Capacity increased: equivalent to
α
+2 HDDs
RAID6 x RAID5 x+
α
Capacity increased: equivalent to
α
+1 HDDs
RAID6 x RAID6 x+
α
Capacity increased: equivalent to
α
HDDs
IMPORTANT: Note the following for the Reconstruction:
„
Be sure to make backup copy of data and perform Consistency Check before starting
Reconstruction.
„
The Reconstruction is disabled in the configuration where several virtual disks are defined in
one disk group
„
During Reconstruction, the processing rate is decreased due to much load.
„
The Reconstruction can be performed for the degraded or partially degraded virtual disk.
However, it is recommended to execute Rebuild to recover the virtual disk, then execute
Reconstruction.
„
During Reconstruction, do not shutdown or reboot the server. If the server is shutdown by an
unforeseen accident such as power interruption, turn on the power again as soon as possible.
The Reconstruction is automatically restarted.
„
In some configuration, Background Initialize may start automatically upon completion of
Reconstruction.