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Chapter 6: Technology Background
121
RAID Volume Migration
Migration is the process of:
• Changing the RAID level
• Adding disk drives but keeping the same RAID level
In the migration process, the existing RAID Volume is called the Source. The
proposed RAID Volume is called the Target. Each target RAID Volume has
certain requirements and they are different for each RAID level. You must meet
all of the requirements in order to successfully migrate a RAID Volume.
In most cases, you must add one or more disk drives during the migration
process. You can never reduce the number of disk drives.
While the migration is running, you can still access the folders on your RAID
Volume and the data they contain.
RAID 0 to RAID 1
A single-drive RAID 0 source Volume can migrate to RAID 1 by adding a disk
drive. This action reduces the Volume’s capacity by one-half but adds fault
tolerance.
RAID 1 to RAID 0
A RAID 1 source Volume can migrate to a RAID 0. This action doubles the
Volume’s capacity but loses fault tolerance.
RAID Volume Rebuilding
When a disk drive in your RAID 1 Volume fails, your data is still available and the
Volume can be recovered.
The RAID 1 Volume will begin to rebuild itself automatically when you remove the
failed disk drive and install a new disk drive.
A RAID 0 Volume cannot be rebuilt because of the way in which data is written to
the disk drives under RAID 0. Even if there is a designated spare drive, rebuilding
is not possible for RAID 0 Volumes.