Promise Technology FastTrak TX4310 User Manual page 114

Raid controller card
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FastTrak TX4310 User Manual
Ranges of Disk Array Expansion
There are limitations to how large you can expand a logical drive, depending on
the size of your current logical drive.
The current PC Operating Systems support a 10-byte LBA format. This means
that a logical drive can have up to 4 billion address blocks or sectors.
Multiply the number of blocks by the sector size to find the capacity of a logical
drive:
4,000,000,000 blocks x 512 bytes per sector = 2,048,000,000,000 bytes
of data for a 2TB drive.
Note that you cannot change the size of the sectors nor can you increase the
number of address blocks above 4 billiion.
As a result, there are range limits imposed upon logical drive expansion as
shown in the table above. For example:
You can expand a 2.5 TB logical drive up to 4 TB
You can only expand a 1.9 TB logical drive up to 2 TB
See the table below.
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, even if the Target logical drive requires fewer disk
drives than the Source logical drive
RAID 1 (mirror) works with two disk drives only
You cannot migrate a logical drive when it is Critical or
performing activities such as Synchronizing, Rebuilding and
PDM
RAID level migration is not possible to or from JBOD
Important
106

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