User`s guide

Chapter 7. Maintaining the Array with the Standalone Configuration Utility
EK–SWRA2–IG. C01 7–21
Table 7–2 Number of Drives You Can Use in a Drive Group for Each RAID
Level
RAID
Level
Number of Drives
in Drive Group
Usable Storage
Data
Redundancy
0 2 to 8 All
No
1 2 50%
Yes
0 + 1 3 to 8 50%
Yes
5 3 to 8
66%87%
Yes
JBOD 1 All
No
NOTE
To maximize the I/O performance of your
multichannel RAID subsystem, locate each
member of a drive group on a separate SCSI
channel. This allows the RAID controller
concurrent access to the disk drives.
Also, the total capacity of a drive group is
determined by the member with the least capacity.
If you are uncertain about the size of a particular
drive, select the Device Information option on the
Define Drive Group screen to check the size
before you create a drive group.
Creating a drive group requires the following procedures:
• Defining a Drive Group
• Arranging a Drive Group