Hot-Pluggable Disk Drives; Support For Raid 0, Raid 1, And Raid 5 Disk Configurations; Environmental Monitoring And Control - Sun Microsystems Enterprise 250 Owner's Manual

Status and control panel LEDs are described in "About the Status and Control Panel"
on page 6. Disk drive and power supply LEDs are described in "Error Indications"
on page 257.

Hot-Pluggable Disk Drives

The "hot-plug" feature of the system's internal disk drives permits the removal and
installation of drives while the system is operational. All drives are easily accessed
from the front of the system. Hot-plug technology significantly increases the system's
serviceability and availability, by providing the ability to:
4 Increase storage capacity dynamically to handle larger work loads and improve
system performance.
4 Replace disk drives without service disruption.
For more information about hot-pluggable disk drives, see "About Internal Disk
Drives" on page 83 and "About Disk Array Configurations and Concepts" on page
209.
Support for RAID 0, RAID 1, and RAID 5 Disk
Configurations
The Solstice DiskSuite software designed for use with the system provides the ability
to configure system disk storage in a variety of different RAID levels. You choose the
appropriate RAID configuration based on the price, performance, and reliability/
availability goals for your system.
RAID 0 (striping), RAID 1 (mirroring), RAID 0+1 (striping plus mirroring) and
RAID 5 configurations (striping with interleaved parity) can all be implemented
using Solstice DiskSuite. You can also configure one or more drives to serve as "hot
spares" to fill in automatically for a defective drive in the event of a disk failure.
For more information about RAID configurations, see "About Disk Array
Configurations and Concepts" on page 209.

Environmental Monitoring and Control

The system features an environmental monitoring subsystem designed to protect
against:
4 Extreme temperatures
4 Lack of air flow through the system
4 Power supply problems
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Hardware Configuration