HP 226593-B21 Smart Array 5i Plus Controller and Battery Backed Write Cache En - Page 92

Other Fault-Tolerance Options, Software-based RAID, Controller Duplexing

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Drive Arrays and Fault Tolerance Other Fault-Tolerance Options Your operating system may also support software-based RAID or controller duplexing. • Software-based RAID resembles hardware-based RAID, except that the operating system works with logical drives as if they were physical drives. To protect against data loss caused by physical drive failure, each logical drive must be in a different array from the others. • Controller Duplexing uses two identical controllers with independent, identical sets of drives containing identical data. In the unlikely event of a controller failure, the remaining controller and drives will service all requests. However, the hardware-based RAID methods described in this appendix provide a much more robust and controlled fault-tolerant environment. Additionally, controller duplexing and software-based RAID do not support online spares, auto-reliability monitoring, interim data recovery, or automatic data recovery. If you decide to use one of these alternative fault-tolerance options, configure your arrays with RAID 0 for maximum storage capacity and refer to your operating system documentation for further implementation details. Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache Enabler User Guide C-11

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Drive Arrays and Fault Tolerance
Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache Enabler User Guide
C-11
Other Fault-Tolerance Options
Your operating system may also support software-based RAID or controller
duplexing.
•
Software-based RAID
resembles hardware-based RAID, except that the
operating system works with logical drives as if they were physical drives. To
protect against data loss caused by physical drive failure, each logical drive must
be in a different array from the others.
•
Controller Duplexing
uses two identical controllers with independent, identical
sets of drives containing identical data. In the unlikely event of a controller
failure, the remaining controller and drives will service all requests.
However, the hardware-based RAID methods described in this appendix provide a
much more robust and controlled fault-tolerant environment. Additionally, controller
duplexing and software-based RAID do not support online spares, auto-reliability
monitoring, interim data recovery, or automatic data recovery.
If you decide to use one of these alternative fault-tolerance options, configure your
arrays with RAID 0 for maximum storage capacity and refer to your operating system
documentation for further implementation details.