Dell H800, H700 manual Fault-Tolerance Features, RAID Level Migration

Dell

Table 8. RAID Level Migration

Source RAID	Target RAID		# of Physical		# of Physical	Capacity	Description
Level	Level		Drives		Drives (End)	Expansion
			(Beginning)			Possible
RAID 0	RAID 1	1		2		No	Converting non-
							redundant virtual disk
							into a mirrored virtual
							disk by adding one drive.
RAID 0	RAID 5		1 or more		3 or more	Yes	At least one drive needs
							to be added for
							distributed parity data.
RAID 0	RAID 6		1 or more		4 or more	Yes	At least two drives need
							to be added for dual
							distributed parity data.
RAID 1	RAID 0	2			2 or more	Yes	Removes redundancy
							while increasing
							capacity.
RAID 1	RAID 5	2			3 or more	Yes	Maintains redundancy
							while doubling capacity.
RAID 1	RAID 6	2			4 or more	Yes	Two drives are required
							to be added for
							distributed parity data.
RAID 5	RAID 0		3 or more		3 or more	Yes	Converting to a non-
							redundant virtual disk
							and reclaiming disk space
							used for distributed
							parity data.
RAID 5	RAID 6		3 or more		4 or more	Yes	At least one drive needs
							to be added for dual
							distributed parity data.
RAID 6	RAID 0		4 or more		4 or more	Yes	Converting to a non-
							redundant virtual disk
							and reclaiming disk space
							used for distributed
							parity data.
RAID 6	RAID 5		4 or more		4 or more	Yes	Removing one set of
							parity data and
							reclaiming disk space
							used for it.

4.5Fault-Tolerance Features

Below is a list of features that provide fault tolerance to prevent data loss:

∙Non-volatile cache: extends data retention from hours to years

∙Support for SMART

∙Redundant path support (for PERC H800 only)

∙Physical disk failure detection

DELL PERC H700 and H800 Technical Guide 16