Number Of Drives You Can Use In A Drive Group For Each Raid Level; How The Capacity Of Each Drive Affects The Capacity Of The Drive Group - Compaq AlphaServer GS60 Operation Manual

Table C-1 Number of Drives You Can Use in a Drive Group for
Each RAID Level
Number of
RAID Drives in
Level Drive Group
0 2 to 8
1 2
0 + 1 3 to 8
5 3 tp 8
JBOD 1
NOTE: The following equation determines the amount of storage available
for unique information in a RAID 5 logical RAID drive:
Usable Space = Total Space * ((N-1_/N where N is the number of
drives in the group.
Table C-2 How the Capacity of Each Drive Affects the Capacity
of the Drive Group
Drive
Group Drives
A 0
1
2
B 0
1
2
Running Configuration Utilities from the SRM Console C-7
Amount of Storage
Available for Unique
Data (percent)
100
50
50
66 to 87
100
Drive's Usable
Drive's Capacity in This
Capacity Group
1 gigabyte 1 gigabyte
2 gigabytes 1 gigabyte
3 gigabytes 1 gigabyte
2 gigabytes 2 gigabytes
2 gigabytes 2 gigabytes
2 gigabytes 2 gigabytes
Data Redundancy
No
Yes
Yes
Yes
No
Drive Group's
Total Capacity
3 gigabytes (due to drive
0's capacity being 1
gigabyte)
6 gigabytes