Chapter 4 Mass Storage Subsystem Configuration 85
All Sun Fire V890 disk drives are dual-ported for multipath access. When used in a
dual-loop configuration, each drive can be accessed through two separate and
distinct data paths. Dual data paths provide the following benefits:
■ Increased bandwidth – Allowing data transfer rates up to 200 Mbytes per second
versus 100 Mbytes per second for single-loop configurations
■ Hardware redundancy – Providing the ability to sustain component failures in one
path by switching all data transfers to an alternate path
For more information on the RAS and performance capabilities of the mass storage
subsystem, see “About Sun Fire V890 Mass Storage Features” on page 79.
Sun Fire V890 disk drives are hot-pluggable. You can add, remove, or replace disks
while the system continues to operate. This capability significantly reduces system
downtime associated with disk drive replacement. Disk drive hot-plug procedures
involve software commands for preparing the system prior to removing a disk drive
and for reconfiguring the operating system after installing a drive. For additional
details, see “About Hot-Pluggable and Hot-Swappable Components” on page 127.
At the front of the system disk cage are several disk drive status LEDs. There are
three LEDs associated with each drive, indicating the drive’s operating status,
hot-plug readiness, and any fault conditions associated with the drive. These status
LEDs help administrators to quickly identify drives requiring service. For additional
details, see “About Disk Drive LEDs” on page 147.
The following figure shows the system’s 12 internal disk slots and associated LEDs.
Disk slots are labeled from 0 to 11.
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