HP P3410A - NetRAID 1M RAID Controller Installation And Configuration Manual page 42

Chapter 4
Although each drive in an array must have the same capacity, one
logical drive can span two or more arrays with different capacities. For
example, one array might contain three drives of 4 MB each, and the
second array might contain three drives of 12 MB each. One logical
drive can span both of these arrays.
Spanned arrays must be numbered consecutively.
When you use an HP NetRAID utility to configure your system, and
you specify that a logical drive will span arrays, the system will span
all eligible arrays that are numbered consecutively and that contain
the same number of disk drives, up to a maximum of eight arrays.
Spanned arrays must be controlled by the same adapter.
Sample Worksheet B
A sample Worksheet B is shown in Figure 4-4. The instructions for filling in
each column are these:
For the Logical Drive # (column 1), use up to 40 logical drives, starting
with LD0.
For the Array # (column 2), start with Array 0 and number consecutively.
In the Span column (3), you can choose to span this LD over the next 1-7
arrays. Enter your choice.
For the RAID Level (column 4), enter 0, 1, 5, 10, or 50
The Logical Drive Size (column 5) is optional. You can let the HP
NetRAID Assistant Wizard calculate the size.
The Stripe Size (column 6) can be 2, 4, 8, 16, 32, 64, or 128 KB.
The Write Policy (column 7) is either Write Back or Write Thru.
The Read Policy (column 8) can be Normal, Read Ahead, or Adaptive
Read Ahead.
The Cache Policy (column 9) can be Cached I/O or Direct I/O.
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Planning