RAIDs
Chapter 4 Storage Configuration and Expansion
43
for servers with four or more drives. In cases where multiple expansion arrays are
attached to the Snap Server, a combination of a RAID 1 and hot spares may be the
optimal configuration for the Snap Server. See the online help for more information.
RAIDs
RAIDs are created, viewed, edited, and deleted from the
Storage > RAID Sets
screen
of the Administration Tool. Snap Servers with four or more drives ship with all disk
drives configured as a RAID 5. Snap Server 110 and 210 ship with the drive(s)
configured as a RAID 0. Before changing the default RAID configuration, consider
the following information on the Snap Server’s RAID implementation.
Note
Much of the configuration discussion presented here is not applicable to Snap
Servers with fewer than four (4) drives. For Snap Server 110 and 210, see the
User’s
Guide for Snap Server 110 and 210
for storage configuration guidelines.
Factors in Choosing a RAID Type
The type of RAID configuration you choose depends on a number of factors:
• The importance of the data
• Performance requirements
• Drive utilization
• The number of available drives
For example, in configuring the four disk drives of the 520, the decision whether to
include a hot spare in the RAID depends on the value you place on capacity vs. high
availability. If capacity is paramount, you would use all drives for storage; if high
availability were more important, you would configure one of the drives as a hot
spare. The following table summarizes the advantages and disadvantages of each
type of RAID.
Caution
To reduce exposure to double-drive disk failures on RAID 5, use no more
than eight drives in a single RAID set and group smaller RAID sets together.
Features
RAID 0
RAID 1
RAID 5
RAID 6
RAID 10
Data Loss Risk
Highest
Lowest
Low
Lower
Very Low
Write Access Speeds
Fastest Fast
Medium
Slower
Faster
Usable Capacity
Highest Lowest
High
Medium
Low
Disks Required
1 or more
2 or more
3 or more
4 or more
4 or more
Supports Hot Spares
No
Yes
Yes
Yes
Yes
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