Managing A Raid Array Without Deleting Data - Buffalo TeraStation 5020 User Manual

Chapter 4 RAID Modes and Drive Management
5
Read the message carefully and select the checkbox, then click OK.
6
The "Confirm Operation" screen will open. Enter the confirmation number, then click OK.
7
The process is complete once you close the confirmation window that appears.
Note: To turn the hot spare back to a normal drive, choose Set as a normal drive.

Managing a RAID Array Without Deleting Data

You can manage a RAID array without erasing data on the drives by using RMM (RAID Mode Manager). The following
chart explains the transition status of drives after using RMM. The "n" in the chart below refers to the number of
drives that make up the RAID array.
Current Drive Status
JBOD
RAID 1
RAID 5
RAID 6
Note: RMM can be used to expand an array by only one drive per operation. To expand by two or more drives, RMM
must be activated multiple times. For example, if you want to create a RAID 6 array by adding two drives, change the
RAID mode to RAID 5 first using one drive, then change it to RAID 6 using another drive.
If using a TeraStation model that currently has unoccupied drive slots, such as in the case of partially-populated
models, follow the procedure below to add new drives first. Otherwise, refer to the procedures in this section to
configure the RAID array. The following examples use the case of the TS5420DN TeraStation model.
Adding a Drive
The procedure for adding a new drive will vary depending on your device.
1
Open the front cover with the included key.
2
Push the drive's unlock button for the empty slot and swing the lock mechanism out.
3
Pull out the drive cartridge and remove it from the TeraStation.
New RAID Mode
RAID 1
RAID 1
RAID 5
RAID 5
RAID 6
RAID 6
Redundancy (Drive Failure
Capacity
Resistance)
No increase Improve (1 drive)
No increase Improve (n − 1 drives)
Increase No change (1 drive)
Increase No change (1 drive)
No increase Improve (2 drives)
Increase No change (2 drives)
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