Thecus N4100PRO User Manual page 52

NOTE
With RAID level migration function, it has two different type "On line" and "Off line"
alone with limitation as listed below.
1. During RAID level migration, it is not allowed reboot or shutdown system.
2. Off line RAID level migration, all services will stop and data is inaccessible.
3. To have ext3 and XFS file system created doing on line RAID level
migration from R1 to R5 or R1 to R6, the all services will restart and
volumes "iSCSI" is read only but "user data" is capable read / write during
operation.
4. The other combination to make as "On line" can have read / write work as
normal.
Migrating a RAID volume could take several hours to complete
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