User manual

Table Of Contents
Chapter 7: Technology Background
249
access the data as before. When migration is complete, your disk array will have
a different RAID level and/or a larger capacity.
In most cases, you must add one or more physical drives during the migration
process. You can never reduce the number of physical drives.
The tables below shows the migration options for a source logical drive according
to its RAID level. The available target RAID levels are shown with their
requirements.
You must use WebPAM PRO to migrate a disk array. See “Migrating a Disk Array
on page 167.
RAID 0
A RAID 0 source logical drive can migrate to the following target logical drives:
Target Requirements
RAID 0 Add physical drives.
RAID 1 2 physical drives only.
Only a single-drive RAID 0 can migrate to RAID 1 by adding 1
physical drive.
RAID 1E 3 or more physical drives.
RAID 5 3 physical drives minimum, 16 maximum.
RAID 0 must have less than 16 physical drives.
RAID 6 4 physical drives minimum, 16 maximum.
RAID 10 4 physical drives minimum.
Even number of physical drives.
RAID 50 6 physical drives minimum, 16 per axle maximum.
RAID 60 8 physical drives minimum, 16 per axle maximum.