Adaptec 3200S User Guide - Page 94

Controller I/O Statistics - ram

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Storage Manager Select Options > Background Task Priority to control the relative priority of I/O from the operating system and background tasks. Figure 3-22 shows the Background Task Settings window. Figure 3-22. Background Task Settings Window - ATA and SCSI The Priority section assigns the controller background task priority. Set the task priority by using the arrow buttons to move the indicator. The indicator moves between Background and Foreground in ten increments. If the indicator is at Background, background tasks are processed only when there is no disk I/O from the host for a period of at least 250 milliseconds. As you move the indicator toward Foreground, more of the controller resources are allocated to background tasks. All of the resources are allocated to background tasks during periods when there is no disk I/O from the host system. Controller I/O Statistics The controller maintains a cumulative record of I/O operations in cache RAM for use in analyzing the efficiency of the storage subsystem. To view this data, select I/O Stats in the Information window for any controller, drive, or array. By analyzing these statistics, the array configuration, cache, and stripe size can be optimized for your particular system configuration. 3-49

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3-49
Storage Manager
Select
Options > Background Task Priority
to control the relative
priority of I/O from the operating system and background tasks.
Figure 3-22
shows the Background Task Settings window.
Figure 3-22. Background Task Settings Window – ATA and SCSI
The Priority section assigns the controller background task priority.
Set the task priority by using the arrow buttons to move the
indicator. The indicator moves between Background and
Foreground in ten increments.
If the indicator is at Background, background tasks are processed
only when there is no disk I/O from the host for a period of at least
250 milliseconds. As you move the indicator toward Foreground,
more of the controller resources are allocated to background tasks.
All of the resources are allocated to background tasks during
periods when there is no disk I/O from the host system.
Controller I/O Statistics
The controller maintains a cumulative record of I/O operations in
cache RAM for use in analyzing the efficiency of the storage
subsystem. To view this data, select I/O Stats in the Information
window for any controller, drive, or array. By analyzing these
statistics, the array configuration, cache, and stripe size can be
optimized for your particular system configuration.