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In the example shown below, the member drives in Logical Drive 0 are
9 GB drives, and the members in Logical Drives 1 and 2 are all 4 GB
drives. It is not possible for the 4 GB Global Spare Drive to join
Logical Drive 0 because of its insufficient capacity. However using a
9GB drive as the Global Spare drive for a failed drive that comes from
Logical Drive 1 or 2 will bring huge amount of excess capacity since
these logical drives require 4 GB only. In the settings below, the 9 GB
Local Spare Drive will aid Logical Drive 0 once a drive in this logical
drive failed. If the failed drive is in Logical Drive 1 or 2, the 4 GB Global
Spare drive will immediately give aid to the failed drive.
Local Spare Drive
LS
(9GB)
1
2
1
(9GB)
(9GB)
(4GB)
3
(9GB)
Logical Drive 0
Logical Drive 1
Identifying Drives
Assuming there is a failed drive in the RAID 5 logical drive, make it a
point to replace the failed drive with a new drive to keep the logical
drive working.
When trying to remove a failed drive and you mistakenly removed the
wrong drive, you will no longer be able to read/write the logical drive
because the two drives may have already failed.
16
Global Spare Drive
GS
(4GB)
Local Spare Drive always
has higher priority than
Global Spare Drive.
1
2
2
(4GB) (4GB)
(4GB)
4
3
(4GB) (4GB)
Logical Drive 2
User's Guide
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