HP LH4r Integrated HP NetRaid Controller Configuration Guide - Page 35

Plan Your Non-Hot-Swap Devices, Plan Your Arrays

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Chapter 4 Planning Plan Your Non-Hot-Swap Devices If you plan to enable integrated HP NetRAID on SCSI B, you need to decide how to use the non-hot-swap SCSI devices. For each non-hot-swap device log its array number in Worksheet A. • Non-hot-swap drives can be used alone, as the only disk in the array. • Non-hot-swap drives can be used in an array with other non-hot-swap drives of the same capacity. For performance reasons, do not use non-hot-swap drives in arrays with hot-swap drives. Do not use non-hot-swap drives as hot spares. Plan Your Arrays In this section you specify which hot-swap drives are assigned to which arrays. For each hot-swap drive that is assigned to an array, log its array number in Worksheet A. When creating your arrays, please consider the following: • Group together hot-swap drives that have the same capacity. (If you use drives with different capacities in an array, all the drives in the array are treated as though they have the capacity of the smallest drive.) • Arrays are numbered sequentially beginning with Array 0. • Arrays can have between one and eight hot-swap drives per array. • The more drives you group together in an array, the better the performance. • The hot-swap drives in an array can be all on the same channel, or they can be on separate channels. • You might plan to reserve one or more hot-swap drives for use as a hot spare. See "Plan Hot Spares (Optional)" later in this chapter for more information. When you create your arrays, you should look ahead toward the logical drives that you will configure later. (Logical drives are discussed in "Plan Logical Drives" later in this chapter.) Here are some considerations about logical drives that might impact how you set up your arrays: 29

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Chapter 4
Planning
29
Plan Your Non-Hot-Swap Devices
If you plan to enable integrated HP NetRAID on SCSI B, you need to decide how
to use the non-hot-swap SCSI devices. For each non-hot-swap device log its array
number in Worksheet A.
•
Non-hot-swap drives can be used alone, as the only disk in the array.
•
Non-hot-swap drives can be used in an array with other non-hot-swap
drives of the same capacity.
For performance reasons, do not use non-hot-swap drives in arrays with hot-swap
drives. Do not use non-hot-swap drives as hot spares.
Plan Your Arrays
In this section you specify which hot-swap drives are assigned to which arrays.
For each hot-swap drive that is assigned to an array, log its array number in
Worksheet A.
When creating your arrays, please consider the following:
•
Group together hot-swap drives that have the same capacity. (If you use
drives with different capacities in an array, all the drives in the array are
treated as though they have the capacity of the smallest drive.)
•
Arrays are numbered sequentially beginning with Array 0.
•
Arrays can have between one and eight hot-swap drives per array.
•
The more drives you group together in an array, the better the
performance.
•
The hot-swap drives in an array can be all on the same channel, or they
can be on separate channels.
•
You might plan to reserve one or more hot-swap drives for use as a hot
spare. See "Plan Hot Spares (Optional)" later in this chapter for more
information.
When you create your arrays, you should look ahead toward the logical drives
that you will configure later. (Logical drives are discussed in "Plan Logical
Drives" later in this chapter.) Here are some considerations about logical drives
that might impact how you set up your arrays: