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StorTrends® 1300 User’s Guide (StorTrends iTX version 2.7) 214
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:
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 Type
0 Standard
1 Standard
5 Standard
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 Pros Cons Max.
Hard
Disk
Drives Fault
Tolerant
0 Data divided in blocks and
distributed sequentially (pure
striping). Use for non-critical data
that requires high performance. High data
throughput for
large files No fault
tolerance. All
data lost if any
hard disk drive
fails. one to 32 no
1 Data duplicated on another hard disk
drive (mirroring). Use for read-
intensive fault-tolerant systems 100% data
redundancy Reduces total
hard disk drive
space by half.
Reduced
performance
during rebuilds. two yes
5 Disk striping and parity data across
all hard disk drives. Use for high
read volume but low write volume,
such as transaction processing. Achieves data
redundancy at
low cost Performance not
as good as RAID
1 three to 32 yes