Acer G301 manual Selecting a RAID Level

82 5 Configuring IDE Software RAID

Selecting a RAID Level

To ensure the best performance, you should select the optimal RAID level when you create a system drive. The optimal RAID level for your disk array depends on the following factors:

•Number of drives in the disk array

•Capacity of the drives in the array

•Need for data redundancy

•Disk performance requirements

The factors you need to consider when selecting a RAID level are listed below.

RAID	Description	Pros	Cons	Number of	Fault
Level	and Use			Drives	Tolerant
0	Data divided	High data	No fault	One to	No
	in blocks and	throughput	tolerance. All	Four
	distributed	for large files.	data lost if
	sequentially		any drive
	(pure		fails.
	striping). Use
	for non-
	critical data
	that requires
	high
	performance.
1	Data	100 percent	Double disk	Two	Yes
	duplicated on	data	space.
	another disk	redundancy	Reduced
	(mirroring).		performance
	Use for read-		during
	intensive		rebuilds.
	fault tolerant
	systems
10	Data divided	100 percent	A minimum	Four	Yes
	in blocks and	data	of four drives
	distributed	redundancy	required.
	sequentially	and High data
	and each	throughput.
	block is
	duplicated to
	another disk.