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KB ID: 4775

Using RAID Mode Manager (RMM) to migrate RAID array

Applies to TeraStation:
  5010/3010/3020 series firmware v4.00 or later
  5000 series firmware v3.70 or later
  7000 series firmware v2.63 or later

With RMM, you can expand/migrate a RAID array without erasing the data on the drives.

o RMM can be used to migrate an array by one drive per operation. To migrate by two or more drives, RMM must be performed multiple times. However, you can add multiple drives to an array to expand the array in one operation.

o If one or more drives fail while migrating the RAID array, data can no longer be retrieved from the TeraStation. Backup the data to another place before migrating the array.

o The added drive has to be the same size or larger than the drives existing in the array. However the RAID capacity is restricted by the smallest drive in the array.

o We suggest avoiding heavy usage to the TereStation while doing an RMM operation. Which will increase the RMM process time, that leaves the RAID array in a much longer state that has less protection.

o During the migration rebuild process, the RAID disks redundancy still relies on the RAID mode before migration, not the new RAID mode.

o Please do not power-off the TeraStation during the migration rebuild process. Terastation will also have the following notification during the process.

       I46: Data migration in progress.
       I47: Do not turn off power to the TeraStation.

 

RAID migration table

 

Changing from JBOD
If you have at least two drives available in JBOD (not in a RAID array), you can migrate to RAID1 array without losing data using RMM. If you want to change from JBOD to RAID type other than RAID1, back up the data to another place and then recreate the RAID array.
Note: You can only preserve data in one of the selected JBOD drives.

 
1.    Choose a RAID array.
2.    Set the RAID mode to “RAID 1”.
3.    Select the “Add a drive to a RAID array with RMM. Your data will be preserved.” checkbox.
4.    Select the drive whose data will be saved from the drop-down list.
5.    Select the drive to add to the RAID array.
6.    Click Create RAID Array.
7.    The “Confirm Operation” screen will open. Enter the confirmation number, then click OK.
8.    Click OK when finished.

 
The new RAID1 array will start to rebuild.
At the same time the data within the “Drive to Preserve” (drive1 in this case) will still be accessible.

  o RMM must be performed multiple times if you want to change to RAID1 with 3 drives or more.

  o During the migration rebuild, if the “Drive to Preserve” hard drive was failed, the migrating RAID1 array will FAIL and data will be inaccessible. If it’s the other hard drive failed, the migrating RAID1 array will DEGRADE, data would still be accessible. You can continue the migrate rebuild by replacing a new hard drive.

Changing from 2 Drive Array
•    RAID0
You cannot add drives or change to another RAID mode from RAID0

•    RAID1 to RAID1 (adding one or multiple drives)
 
Note: After configure to RAID1 array with 3 or more drives, you will not be able to migrate to another RAID mode.

•    RAID1 to RAID5

 
Note: Before the migration rebuild finishes, the RAID disks redundancy still relies on the original RAID1 array, not the new RAID5. If both drive1 and drive2 fail before the migration finishes, the array will FAIL and data will be inaccessible.

Changing from 3 drive array
•    RAID0
You cannot add drives or change to another RAID mode from RAID0

•    RAID1 to RAID1  (adding one or multiple drives)
 
Note: You cannot migrate to another RAID mode on RAID1 array with 3 or more drives.

•    RAID5 to RAID5 (adding one or multiple drives)

•    RAID5 to RAID6
 
Note:
o    You cannot RMM migrate a RAID5 array to RAID6 without adding a drive.
o    Before the migration rebuild finishes, the RAID disks redundancy still relies on the original RAID5 array, not the new RAID6. For instance, if 2 of the 3 original RAID5 disks failed during the rebuild, the array will fail.

Changing from 4 drive array
•    RAID0
You cannot add drives or change to another RAID mode from RAID0

•    RAID1 to RAID1  (adding one or multiple drives)
 
Note: You cannot migrate to another RAID mode on RAID1 array with 3 or more drives.

•    RAID5 to RAID5  (adding one or multiple drives)

•    RAID5 to RAID6
You cannot migrate to another RAID mode on RAID5 array with 4 or more drives. You will have to backup the data and recreate the array.

•    RAID6 to RAID6  (adding one or multiple drives)
 
Note: You will not be able to migrate RAID6 to another RAID mode.  You can add one or multiple drives (if available) to expand the RAID6 array.

•    RAID10
You cannot add drives or change to another RAID mode from RAID10

 

Changing from 6 drive array

•   RAID50/51/60/61  (TS5000/TS7000 series)
You cannot add drives or change to another RAID mode from these RAID modes.