Using Solaris Volume Manager With Networked Storage Devices
Solaris Volume Manager works well with networked storage devices, particularly those devices that
provide configurable RAID levels and flexible options. Usually, the combination of Solaris Volume
Manager and such devices can result in performance and flexibility that is superior
to either product alone.
Generally, do not establish Solaris Volume Manager's RAID-5 volumes on any hardware storage
devices that provide redundancy (for example, RAID-1 and RAID-5 volumes). Unless you have
a very unusual situation, performance suffers. Also, you will gain very little in
terms of redundancy or higher availability.
Configuring underlying hardware storage devices with RAID-5 volumes, on the other hand, is
very effective. Doing so provides a good foundation for Solaris Volume Manager
volumes. Hardware RAID-5 provides additional redundancy for Solaris Volume Manager's RAID-1 volumes, soft partitions,
or other volumes.
Note - Do not configure similar software and hardware devices. For example, do not build
software RAID-1 volumes on top of hardware RAID-1 devices. Configuring similar devices in
hardware and software results in performance penalties without offsetting any gains in reliability.
Solaris Volume Manager's RAID-1 volumes that are built on underlying hardware storage devices
are not RAID-1+0. Solaris Volume Manager cannot understand the underlying storage well enough
to offer RAID-1+0 capabilities.
Configuring soft partitions on top of Solaris Volume Manager RAID-1 volume, built
in turn on a hardware RAID-5 device, is a very flexible and resilient