HP P3410A - NetRAID 1M RAID Controller Installation And Configuration Manual page 41

Hp netraid 1m/2m installation & configuration
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Chapter 4
Plan Logical Drives
Logical drives are virtual drives configured within an array or across arrays.
Logical drives can take three forms:
A logical drive can use all of the storage capacity of one array.
A logical drive can use less than the available storage capacity of one
array. The remaining capacity can be used by additional logical drives.
A logical drive can span arrays by using capacity in up to eight arrays.
Spanned logical drives can use all of the storage capacity of the arrays
they span, or they can use less than all the available capacity.
General Considerations
Consider the differing needs of work groups or users for security, data protection,
and performance as you decide how to configure the logical drives in each array.
Here are some considerations about logical drives that might impact how you set
up your arrays:
You must configure at least one logical drive per array.
A single array can be divided into a maximum of 40 logical drives.
However, if you want to use the online capacity expansion feature later,
plan to create just one logical drive per array.
The adapter can support a maximum of 40 logical drives.
Consider what RAID levels you need. Review the information in
Chapter 2 and look at Tables 2-1 and 2-2 that compare the RAID levels.
Look at the arrays you have defined so far. Ensure that the arrays contain
the minimum number of physical drives required for the RAID levels you
want to create.
Make sure the redundancy requirements of the RAID levels you want
leave you with enough capacity for your data.
If you want a logical drive to span two or more arrays, consider the
following:
You cannot use the online capacity expansion feature with logical
drives that span arrays.
Spanned arrays must contain the same number of disk drives per
array.
Planning
33

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