Mylex DAC960PG, Installation Manual

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Drive Organization
2-8 DAC960PG Installation Guide
Drive Organization
The DAC960PG controller organizes the SCSI drives connected to it as
physical drives and logical units.
Physical Drives (Drive Groups or Packs)
Using the DAC960PG up to eight individual disk drives can be used together
to form a pack or drive group of physical drives that will be used to comprise
the array’s logical unit capacity.
☛
Note
If all of the disks in a drive group are not the same
size, the drive group has the effective capacity of the
smallest drive in the group times the number of
drives.
To determine the total size of a drive group, multiply the size of the smallest
drive in the drive group by the number of disk drives in the group.
For example, if there are four drives of 4 GB each, and one drive of 2 GB
comprising a drive group, the effective capacity available for use is 10 GB
(5 x 2), not 18 GB.
The DAC960PG supports up to eight (8) drive groups.
Logical Drives (System Drives)
A logical drive (or system drive) is that portion of a drive group (or a
combination of up to eight drive groups) seen by the host system as a single
logical device. The maximum addressable size of a single logical drive is
2 TB.
☛
Note
Use the DACCF software utility or the Global Array
Manager (GAM) to configure the logical drives
(system drives).