Promise Technology E310f, Product Manual

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VTrak E-Class Product Manual
102
When disk drives of different capacities are used in the same array,
coercion reduces the usable capacity of the larger disk drive(s) in order
to match the smallest capacity drive.
For more information, see “Capacity Coercion” on page 239.
• Select a coercion method from the Coercion Method dropdown menu.
The choices are:
GB Truncate – (Default) Reduces the useful capacity to the nearest
1,000,000,000 byte boundary.
10GB Truncate – Reduces the useful capacity to the nearest
10,000,000,000 byte boundary.
Group Rounding – Uses an algorithm to determine how much to
truncate. Results in the maximum amount of usable drive capacity.
Table Rounding – Applies a predefined table to determine how much
to truncate.
• Enter a time interval (1 to 12 seconds) in the Write Back Cache Flush
Interval field.
For more information, see “Cache Policy” on page 236.
• Enter a time interval (15 to 255 seconds) in the Enclosure Polling
Interval field.
• Check the Adaptive Writeback Cache box to enable the Adaptive
Writeback Cache feature.
For more information, see “Adaptive Writeback Cache” on page 237.
6. Click the Submit button.
The changes take effect immediately.
Clearing an Orphan Watermark
An Orphan Watermark condition is the result of a disk drive failure during an
NVRAM RAID level migration on a disk array.
To clear an Orphan Watermark:
1. Click the Subsystem icon in Tree View.
2. Click the Controllers icon.
3. Click the Controller icon.
4. Click on the Clear tab in Management View.
5. Click the Submit button.
The changes take effect immediately. If your subsystem has two controllers,
clearing a condition on one controller will automatically apply to the other
controller.