Selecting A Raid Level - American Megatrends StorTrends 1100-P User Manual

Selecting a RAID Level

There are six official RAID levels (RAID 0 through RAID 5). The StorTrends® iTX
Software supports RAID levels 0, 1, and 5.
Note:
Your hardware may contain a controller that supports RAID 10, RAID 50, RAID 1n and
RAID 10n.
RAID Level
0
1
5
To ensure the best performance, you should select the optimal RAID level when you
create a system volume. The optimal RAID level for your volume depends on a number
of factors:
•
the number of hard disk drives in the StorTrends® iTX Storage Appliance
•
the capacity of the hard disk drives in the StorTrends® iTX Storage Appliance
•
the need for data redundancy
•
the hard disk drive performance requirements
The factors you need to consider when selecting a RAID level are listed below:
Level Description and Use
0 Data divided in blocks and
distributed sequentially (pure
striping). Use for non-critical data
that requires high performance.
1 Data duplicated on another hard disk
drive (mirroring). Use for read-
intensive fault-tolerant systems
5 Disk striping and parity data across
all hard disk drives. Use for high
read volume but low write volume,
such as transaction processing.
86 ManageTrends (version 2.6) Web Interface User's Guide
Type
Standard
Standard
Standard
Pros Cons
High data No fault
throughput for tolerance. All
large files data lost if any
hard disk drive
fails.
100% data Reduces total
redundancy hard disk drive
space by half.
Reduced
performance
during rebuilds.
Achieves data Performance not
redundancy at as good as RAID
low cost 1
Max. Fault
Hard Tolerant
Disk
Drives
one to 32 no
two yes
three to 32 yes