Adaptec DuraStor 6200SR User Manual page 74

Note: We strongly recommend that you leave the backoff
percent at 1%.
The backoff percent setting backs off or reduces the capacity of the
array by the given percentage. The backoff percentage helps when
you assign spares by compensating for the minor capacity
differences that occur between vendors. For example, two 18-GB
disk drives from two different vendors may differ in capacity by
100 MB. With a backoff of 0%, you would not be able to replace an
array member's slightly larger 18-GB disk drive with a smaller
18-GB disk drive. If you intend to only use identical disk drives
from the same vendor, then you can use a backoff of 0%.
The default setting is 1% backoff. This default allows you to easily
work with disk drives that have the same nominal capacity, but
different actual capacities. The backoff percentage affects all arrays
created on the controller after you set the percentage.
If the disk drives in an array are not equal in size, the array
capacity in a RAID 5 array is based on the smallest member's
capacity. The backoff percentage is then backed off the capacity
from that amount.
To change the backoff percentage
1
From the System Menu, choose Config Menu, then press Enter.
The Configuration Menu appears.
2
Choose Backoff Percent and press Enter.
The Backoff Percent prompt appears.
3
Enter the backoff percent you want to use as three digits using
the following format: 00.0%. The default is 01.0%.
You must enter each digit individually:
a
Press Enter and use
b
Press Enter and use
c
Press Enter and use
d
Press Enter.
↑ ↓
and to choose the first digit.
↑ ↓
and to choose the second digit.
↑ ↓
and to choose the third digit.
Troubleshooting
7-2