Clearing An Orphan Watermark - Promise Technology VessRAID 1740s Product Manual

VessRAID 1740s, 1840s Product Manual
5. Make the following settings as needed:
• Enter a name into the Alias field.
Maximum of 48 characters. Use letters, numbers, space between
words, and underscore. An alias is optional.
• Check the SMART Log box to enable the Self-Monitoring, Analysis, and
Reporting System (SMART).
• Enter a polling interval (1 to 1440 minutes) in SMART Polling Interval
field.
• Check the Coercion Enabled box to enable disk drive capacity coercion.
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 236.
• 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 234.
• Enter a time interval (15 to 255 seconds) in the Enclosure Polling
Interval field.
• Check the Enable Adaptive Writeback Cache box to enable this
function.
For more information, see "Adaptive Writeback Cache" on page 235.
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.
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