User`s guide

StorageWorks RAID Array 200 Subsystem Family
Creating a Drive Group
A single controller can support up to eight drive groups. Remember these general
rules when you configure your array:
•
Maximum number of drive groups: 8
•
Maximum number of drives in each drive group: 8
•
Maximum number of logical RAID drives: 8
The choice of RAID level for logical RAID drives depends on the number of drives
within a drive group. This table shows the RAID levels for drive group/RAID level
requirements.
RAID Level
Drives in
Drive
Group
Usable
Storage
Data
Redundancy
0
2

8
All
No
1
2
50%
Yes
0 + 1
3

8
50%
Yes
5
3

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.
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