Dell PERC S300, (PERC) S100 manual Allows hot-swapping

Table 3-1. Features of the PERC S100 controller and PERC S300 controller (continued)

RAID Controller Feature	Description
Consistency check	A consistency check is a background operation that verifies
(CC)	and corrects the mirror or parity data for fault-tolerant
	physical disks. It is recommended that you periodically run a
	consistency check on the physical disks.
	By default, a consistency check corrects mirror or parity
	inconsistencies. After the data is corrected, the data on the
	primary physical disk in a mirror set is assumed to be the
	correct data and is written to the secondary physical disk in
	the mirror set.
	A consistency check cannot be user-initiated in the PERC
	Virtual Disk Management utility. However, a consistency
	check can user-initiated when using Dell OpenManage Server
	Administrator Storage Management.
Disk initialization	For physical disks, initialization writes metadata to the
	physical disk, so that the controller can use the physical disk.
Fault tolerance	The following fault tolerance features are available with the
	PERC S100 adapter and PERC S300 adapter, in order to
	prevent data loss in case of a failed physical disk:
	• Physical disk failure detection (automatic).
	• Virtual disk rebuild using hot spares (automatic, if the hot
	spare is configured for this functionality).
	• Parity generation and checking (RAID 5 only).
	• Hot-swap manual replacement of a physical disk without
	rebooting the system (only for systems with a backplane that
	allows hot-swapping).
	If one side of a RAID 1 (mirror) fails, data can be rebuilt by
	using the physical disk on the other side of the mirror.
	If a physical disk in RAID 5 fails, parity data exists on the
	remaining physical disks, which can be used to restore the
	data to a new, replacement physical disk configured as a hot
	spare.
	If a physical disk fails in RAID 10, the virtual disk remains
	functional and data is read from the surviving mirrored
	physical disk(s). A single disk failure in each mirrored set can
	be sustained, depending on how the mirrored set fails.

Features

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