User's Guide

4-38 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 on-board RAID (LSI
Logic MegaRAID SAS PCI EXPRESS ROMB) supports "Migration with addition" only.
Removed physical drive
Unsupported.
Migration only
Unsupported.
Migration with addition
Use this feature to add HDDs to existing virtual disk. On MSM, this feature is indicated as "Add
Drive". The execution patterns are as shown below (α: Number of HDDs to be added).
Before execution After execution
Description
RAID
level
Number
of HDDs
RAID
level
Number
of HDDs
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
RAID1 2 RAID0
2+α Capacity increased: equivalent to α+1 HDDs
RAID1 2 RAID5
2+α Capacity increased: equivalent to α HDDs
RAID5 x RAID0
x+α Capacity increased: equivalent to α+1 HDDs
RAID5 x RAID5
x+α Capacity increased: equivalent to α HDDs