
Advanced Technology and Systems Co., Ltd.
8
1.6
Dynamic Data Reallocation
The ArrayMasStor J Series supports dynamic data reallocation, which allows the expansion of the
ArrayMasStor’s capacity by adding new drives without data loss. The additional storage capacity is
assigned a new LUN.
The original data is reallocated to suitable locations, and the parity data (for RAID Level 5) is
automatically regenerated. For RAID Level 1, the mirror data is written alongside the original data
and the original drive information is re-striped over the new drives. RAID Level 0 also offers this
feature, but there is no data redundancy when the re-stripping or reallocation procedure is executed.
Increasing the number of drives allows the same total storage capacity to be accessed faster, because
four (rather than three) drives are concurrently accessing the 40 MB of data in each LUN. Each new
LUN is treated as an individual drive by the host computer, and is easily configured from the
operating system for immediate use.
IMPORTANT !
It is strongly recommended that the surface verification
check implement before dynamic data reallocation.
IMPORTANT !
ArrayMasStor
won’t permit to access from the host computer
while carrying out
dynamic data reallocation
.
CURRENT CONFIGURATION
NEW DRIVE
NEW CONFIGURATION
LUN 0
LUN 0
LUN 0
LUN 1
LUN 0
LUN 1
LUN 0
LUN 1
LUN 0
LUN 1
LUN 0
REALLOCATION
PROCEDURE