Chapter 3: Subsystem Connection and Operation
Host Connection
Sample Topologies
3-3
NOTE:
It is recommended to use the default of SCSI bus associated settings in
firmware.
3.2 Host Connection Sample Topologies
3.2.1 Basic Configuration Rules
Shown below are some basic rules that should be followed.
•
When selecting the number of hard drives that will be grouped into
RAID configurations and mapped to host IDs, the transfer rates of the
host busses and the mechanical performance of the hard disks should be
considered. It is recommended to select 8 disk drives for each logical
drives (the logical RAID configuration of multiple hard drives).
Namely, create two logical drives in your subsystem and associate them
each with a host ID on separate host channels.
•
When cabling, follow all SCSI channel specifications. Pay attention to
signal quality and avoid electronic noise from adjacent interfaces.
•
The drives in the same logical array should have the same capacity, but
it is preferred that all the drives within the subsystem have the same
capacity.
•
A spare drive should have a minimum capacity equal to the largest
drive that it is expected to replace. If the capacity of the spare is less
than the capacity of the drive it is expected to replace, then the
controller will not be able to proceed with the failed drive rebuild.
3.2.2 Simple, Direct Connection to Single Host Computer
The GALAXY RAID is directly connected to a host computer.
