Drive Arrays; Fault Tolerance - Compaq 219700-001 - ProLiant - 1500 Reference Manual

Drive Arrays

Drive array technology distributes data across a series of hard drives to unite
these physical drives into one or more higher performance logical drives.
Distributing the data makes it possible to access data concurrently from
multiple drives in the array, yielding I/O rates faster than non-arrayed drives.
Each logical drive in the array may be set to a different fault tolerant
configuration. The SMART-2DH Array Controller manages the drive array
independent of the host processor.
There may be several possible ways to configure each set of hardware. The
Array Configuration Utility is used to help you configure the hardware in the
way that best suits your needs.
See Appendix D for more information on drive arrays. See Chapter 5,
"Running the Array Configuration Utility," for information on configuring
your drive arrays using the Compaq Array Configuration Utility.

Fault Tolerance

Fault tolerance refers to several possible methods used to protect data from
being lost in the event of a hardware failure somewhere in the storage system.
Each method has its advantages, so choosing one requires careful planning for
your particular requirements.
The fault tolerance methods supported by the SMART-2DH Array Controller
and the Compaq Array Configuration Utility include:
Distributed data guarding (RAID 5)
Data guarding (RAID 4)
Drive mirroring (RAID 1)
No fault tolerance (RAID 0)
Writer: Pamela King Project: SMART-2DH Array Controller Reference Guide Comments: 295469-002
CAUTION: It is recommended that any time you move drive
arrays or change your configuration you should back up data.
File Name: B-CH01.DOC Last Saved On: 2/27/98 11:23 AM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
SMART-2DH Array Controller Reference Guide
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