Chapter 4
Planning
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As explained in Chapter 1, "Introduction," for each channel, you have either one
internal or one external connection. HP NetRAID-1M and 2M adapters support
the following channels and connectors:
•
The HP NetRAID-1M adapter provides an internal and external connector
for Channel 0.
•
The HP NetRAID-2M adapter provides internal and external connectors
for Channels 0 and 1.
SCSI Transfer Rate
On Worksheet A, record the SCSI transfer rate for each channel. The default
SCSI transfer rate is Ultra3, but you can change this rate to Fast, Ultra, or Ultra2.
Step B. Plan Arrays and Logical Drives
There are two ways to set up arrays and logical drives.
•
Automatic configuration is explained for those users who do not want to
customize their arrays and logical drives.
•
Custom configurations permit you to create exactly the configuration that
best suits your needs.
Automatic Configuration
Automatic mode defines the arrays and logical drives for you, and sets their
parameters. It makes configuration easy.
Automatic mode uses the following rules to define arrays:
•
It scans the physical drives, starting at SCSI ID 0 on Channel 0, and it
groups the physical drives by capacity, with up to five drives in an array.
•
Each array is defined as a single logical drive, and array spanning is not
used.
•
For each array, the system looks to see if you have asked to implement
redundancy (checked the Redundancy box). If you are not using
redundancy, all logical drives are assigned RAID level 0.
•
If an array contains two drives, and you checked Redundancy, the logical
drive is assigned RAID level 1.
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