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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 are supported by your StorTrends 2200.
See the Intel (made by LSI Logic) RAID Software User's Guide that shipped with your
StorTrends 2200 for more information on what hardware RAID levels are supported.
Your StorTrends 2200 should have a RAID controller that supports RAID 0, RAID 1,
RAID 5, RAID 10 and RAID 50. Depending on your StorTrends 2200 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 StorTrends storage appliance
•
the capacity of the hard disk drives in the StorTrends iTX StorTrends 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.
160
StorTrends/ManageTrends (version 2.7) Web Interface User's Guide for the StorTrends 2200 Storage Appliance
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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