HP AD510A HP StorageWorks 1500 Modular Smart Array Installation Guide (355901- - Page 33

Spare drives, Array sizing capacity, As a general rule

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Installation Procedures - All Deployments Spare drives HP recommends including spare drives in your LUNs. Spares are hard drives that are not active members of any particular LUN, but have been configured to be used in the event that a drive in one of the LUNs should fail. If a spare is present and a physical hard drive fails, the spare automatically replaces the failed drive as a member of the LUN and the process of rebuilding the information onto the spare automatically begins. The system uses the mirrored or parity information from the other member drives to reconstruct the data onto the spare. Array sizing (capacity) When planning for optimal file serving performance, you must determine the number of hard drives necessary to maintain an optimum performance level. As a general rule, the greater the number of drives that are included in an array, the greater the performance level that can be achieved. However, the performance considerations are offset by fault tolerance considerations - the greater the number of drives in an array, the higher the probability of one or more failures in that array. HP StorageWorks 1500 Modular Smart Array Installation Guide 33

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Installation Procedures - All Deployments
33
HP StorageWorks 1500 Modular Smart Array Installation Guide
Spare drives
HP recommends including spare drives in your LUNs.
Spares are hard drives that are not active members of any particular LUN, but have
been configured to be used in the event that a drive in one of the LUNs should fail.
If a spare is present and a physical hard drive fails, the spare automatically
replaces the failed drive as a member of the LUN and the process of rebuilding the
information onto the spare automatically begins. The system uses the mirrored or
parity information from the other member drives to reconstruct the data onto the
spare.
Array sizing (capacity)
When planning for optimal file serving performance, you must determine the
number of hard drives necessary to maintain an optimum performance level.
As a general rule, the greater the number of drives that are included in an array, the
greater the performance level that can be achieved. However, the performance
considerations are offset by fault tolerance considerations — the greater the
number of drives in an array, the higher the probability of one or more failures in
that array.