User Guide

WebPAM User Manual
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You can change the RAID level of a logical drive with certain combinations of
RAID level and number of physical drives, as described in the table below.
You can add physical drives while keeping the same RAID level only to a RAID 0
logical drive, as described in the table below.
Ranges of Logical Drive Migration
There are limitations to how large you can expand a logical drive, depending on
the size of your current logical drive.
The Windows 2000 and Windows XP (32-bit) operating systems support a
10-byte LBA format. This means that a logical drive can have up to 4 billion
From To Result
RAID 0: 1 or 2 drives RAID 10: 4 drives Increased performance
and capacity, adds
redundancy
RAID 0: 3 drives RAID 5: 4 drives Increased performance
and capacity, adds
redundancy
RAID 1: 2 drives RAID 10: 4 drives Increased performance
and capacity
From To Result
RAID 0: 1 drive RAID 0: 2, 3 or 4 drives Increased capacity
RAID 0: 2 drives RAID 0: 3 or 4 drives Increased capacity
RAID 0: 3 drives RAID 0: 4 drives Increased capacity
Important
• The Target logical drive may require more disk drives than the
Source logical drive
• If the Target logical drive requires an EVEN number of disk
drives but the Source logical drive has an ODD number, ADD
a disk drive as part of the migration process
• You cannot reduce the number of disk drives in your logical
drive
• You cannot migrate a logical drive when it is Critical or
performing activities such as Synchronizing or Rebuilding