User`s guide

4-48 Configuring Your Server
Background Initialize
The Background Initialize feature is automatically executed when a RAID5 virtual disk is created in the disk group including
five or more HDDs.
The Background Initialize performs the parity generation processing in the background to the area not initialized. The
processing is equivalent to a Consistency Check.
However, the Background Initialize is not performed in the following cases.
 A full Initializing has already been executed and completed normally before executing the Background Initialize
feature.
(*) A Full Initializing clears the entire area of a virtual disk with "0".
 A Consistency Check has already been executed and completed normally before executing a Background Initialize.
 A Rebuild has already been executed and completed normally before executing a Background Initialize (for RAID5
only).
 "Yes" is specified for "Disable BGI" in VD Definition.
 Virtual disk is in a degraded or offline state.
A Background Initialize is performed if the virtual disk of RAID6 is partially degraded.
The Background Initialize is executed again if any of the following cases occurred in the virtual disk on which the Background
Initialize has completed.
 When the virtual disk is degraded or offline, the offline HDD is put Online, and the virtual disk state becomes
Optimal.
 When you replace the RAID Controller..
 When you execute a Reconstruction to an existing virtual disk to make RAID5 VD with five or more HDDs.
IMPORTANT: Note the following for Background Initialize:
 During a Background Initialize, the processing rate is decreased due to the high load.
 A Background Initialize will resume a few minutes later even if it is interrupted.