Acer G320 Series Assigning RAID levels, RAID Level Minimum number Maximum number Physical drives

• Reduced performance during rebuilds.

98 Appendix B: SATA RAID configuration

Assigning RAID levels

Only one RAID level can be assigned to each array. The table below displays the drives required per RAID level.

RAID Level	Minimum number of	Maximum number of
	physical drives	physical drives
0	One	Four
1	Two	Two
10	Four	Four

The factors you need to consider when selecting a RAID level are listed in the table below:

Level	Description	Pros	Cons	No. of	Fault
	and use			Drives	Tolerant

0	Data divided	High data
	in blocks and	throughput
	distributed	for large
	sequentially	files

(pure striping).

Note: Use for non-critical data that requires high performance.

• No fault	One to No
tolerance.	four

•Data is lost if a drive fails.

1	Data	100 percent	•	More disk	Two	Yes
	duplicated on	data		space
	another disk	redundancy,		required.
	(mirroring).	providing	•	Reduces
	Note: Use for	fault		usable disk
	read-intensive,	tolerance.		space to the
	fault-tolerant			size of the
	systems.			smallest
				drive.