Promise Technology FastTrak TX4650 User Manual page 127

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Ranges of Logical Drive Expansion
The Windows 2000 and Windows XP (32-bit) operating systems support a 10-
byte LBA format. As a result, these OSes can only recognize 4 billion addresses.
Your logical drive is limited to 2 TB of data, even if there is more space available
on your physical drives.
This limitation does not apply to Windows XP (64-bit), 2003 Server, Vista, and
Linux OSes with the 2.6 kernel.
You can direct WebPAM to expand a logical drive beyond the maximum
expansion size. When the expansion is finished:
• WebPAM will show the logical drive in the desired size.
• Your operating system might show the logical drive 2 TB.
• Additional capacity might appear as unpartitioned and unformatted.
At this point, you can format the unpartitioned/unformatted capacity as a second
logical drive.
The Target logical drive may require more physical drives
than the Source logical drive
If the Target logical drive requires an EVEN number of
physical drives but the Source logical drive has an ODD
number, ADD a physical drive as part of the migration
process
You cannot reduce the number of physical drives in your
logical drive, even if the Target logical drive requires fewer
physical drives than the Source logical drive
RAID 1 (mirror) works with two physical drives only
You cannot migrate a logical drive when it is Critical or
performing activities such as Synchronizing, Rebuilding, and
PDM
Logical drive migration is not possible to or from JBOD
Important
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Chapter 6: Technology