Dell S300 Disk States Virtual and Physical Disks, Table B-2. Physical Disk States Definition

Table B-1. RAID Levels and Characteristics (continued)

RAID Level Main Characteristics Advantages

RAID 5 (striping with	Stripes data, as well as parity,
parity)	across all physical disks in the
	virtual disk. Parity
	information is interspersed
	across the virtual disk.
	In the event of a single
	physical disk failure, parity
	data exists on the remaining
	physical disks, which can be
	used to restore the data to a
	new, replacement physical
	disk.

•Offers exceptional read performance, as well as redundancy.

•Requires only one extra physical disk to offer redundancy.

•For most systems with three or more physical disks this is the best choice as a RAID level.

Disk States - Virtual and Physical Disks

The following tables indicate the statuses that can appear at the PERC Virtual Disk Management utility.

Table B-2. Physical Disk States

State	Definition
ATAPI	Indicates a peripheral device (CD-ROM, DVD, or tape drive) instead
	of a physical disk. An ATAPI device cannot be initialized or added to
	a virtual disk.
Non-Raid	A physical disk has been moved from another, non-PERC S100
	controller or non-PERC S300 controller.
Online	The physical disk has been initialized and is part of a virtual disk.
Ready	The physical disk has been initialized but is not currently used in a
	virtual disk.
Failed	A failed physical disk appears as Failed only when (a) View Virtual
	Disk Details is selected, and (b) the virtual disk to which the physical
	disk belongs is selected. The Failed status is reported only when the
	physical disk is part of a virtual disk.
Spare	A physical disk that is assigned as a dedicated or global hot spare.

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Appendix B