Product manual

VTrak M-Class Product Manual
250
The current iSCSI and Fibre Channel HBA cards and PC Operating Systems
support a 10-byte LBA format. This means that a disk array 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 disk
array:
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 billion.
As a result, there are range limits imposed upon disk array expansion as shown
in the table above. For example:
• You can expand a 2.5 TB disk array up to 4 TB
• You can only expand a 1.9 TB disk array up to 2 TB
See the chart below.
You can direct WebPAM PRO or the CLU to expand a disk array beyond the
maximum expansion size. However, when expansion is finished, your disk array
will be the maximum size listed in the table.
If you require a disk array larger than the maximum expansion size:
1. Backup the data from the current disk array.
2. Delete the current disk array.
3. Create a new disk array with the desired capacity.
4. Restore the data to the new disk array.
Media Patrol
Media Patrol is a routine maintenance procedure that checks the magnetic media
on each disk drive. Media Patrol checks all physical drives assigned to disk
arrays. Media Patrol does not check unconfigured drives.
Current LD Size
Maximum LD
Expansion Size
Sector Size
8 to 16 TB 16 TB 4096 bytes
4 to 8 TB 8 TB 2048 bytes
2 to 4 TB 4 TB 1024 bytes
0 to 2 TB 2 TB 512 bytes