Installation Procedures - for all MSA1000 Deployments
20 MSA1000 Installation Guide
Hard Drive Sizes and Types
Arrays should be composed of hard drives of the same size and type. When drive
types are mixed within a storage enclosure, the usable capacity and the processing
ability of the entire storage sub-system is affected.
For example, when an array is composed of different sized drives, the array
defaults to the smallest individual drive size, and capacity in the larger drives goes
unused. Similarly, when different drive types are included in the same enclosure,
the processing characteristics of the entire enclosure are reduced to that of the
slowest drive.
Spare Drives
HP recommends including spare drives in your arrays.
Spares are disks that are not active members of any particular array, but have been
configured to be used in the event that a disk in one of the arrays should fail. If a
spare is present and a physical drive fails, the spare automatically replaces the
failed drive as a member of the array and the process of rebuilding the information
onto the spare automatically begins. The system uses the parity information from
the other member disks to reconstruct the data onto the spare drive.
After the rebuild process is complete, you must replace the failed drive and also
make sure to configure a new drive as a spare.
LUN Sizing
When planning for optimal file serving performance, the number of hard drives
necessary to maintain an optimum performance level must be determined.
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 disk
failures in that array.
A common practice is to include 14 or fewer physical drives in an array.
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General
Weight and Dimensions
