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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.
Not all RAID levels mentioned in this document MAY be supported by your StorTrends
1300 storage appliance.
Your StorTrends 1300 storage appliance should have a RAID controller that supports
RAID 0, RAID 1, RAID 5, RAID 10 and RAID 50. Depending on your StorTrends 1300
storage appliance configuration, your RAID controller MAY also support RAID 6 and
RAID 60.
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.
214
StorTrends® 1300 User's Guide (StorTrends iTX version 2.7)
NOTE:
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
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