Adaptec 3210S User Guide - Page 100

Rescanning a Controller, Task Priority

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Adaptec Storage Manager Pro User's Guide Background tasks are processed only when there is no disk I/O from the computer for a period of at least 250 milliseconds. As a result, background tasks take longer to complete, but they have the least amount of impact to I/O performance. Foreground tasks consume more of the available bandwidth. As a result, foreground tasks are completed more quickly than background tasks, but they can reduce I/O performance. Note: Regardless of the priority level set for controller tasks, 100 percent of the bandwidth is allocated to background tasks when there is no disk drive I/O from the host computer. To set the controller task priority: 1 In the System Browser window, select the controller for which you want to set the task priority. 2 Click Task Priority. The Set Controller Task Priority dialog box appears. 3 Move the slider bar between Background and Foreground depending on the priority level you want to set: - Background-Completes the tasks in the background and does not compete for I/O bandwidth from the host computer. As more tasks are set to the background, it takes longer to complete tasks, but the background tasks allow for normal system operation. - Foreground-Speeds up the completion of the tasks; however, as more tasks are set to the foreground, more available bandwidth is consumed by these tasks, thus reducing I/O performance. 4 Click OK. Rescanning a Controller You can rescan the channels of the selected controller to verify the presence of existing devices or to recognize new devices added to a channel. 9-2

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9-2
Adaptec Storage Manager Pro User
’
s Guide
Background tasks are processed only when there is no disk I/O from
the computer for a period of at least 250 milliseconds. As a result,
background tasks take longer to complete, but they have the least
amount of impact to I/O performance.
Foreground tasks consume more of the available bandwidth. As a
result, foreground tasks are completed more quickly than
background tasks, but they can reduce I/O performance.
Note:
Regardless of the priority level set for controller tasks,
100 percent of the bandwidth is allocated to background
tasks when there is no disk drive I/O from the host
computer.
To set the controller task priority:
1
In the System Browser window, select the controller for which
you want to set the task priority.
2
Click
Task Priority
.
The Set Controller Task Priority dialog box appears.
3
Move the slider bar between Background and Foreground
depending on the priority level you want to set:
–
Background
—
Completes the tasks in the background and
does not compete for I/O bandwidth from the host
computer. As more tasks are set to the background, it takes
longer to complete tasks, but the background tasks allow
for normal system operation.
–
Foreground
—
Speeds up the completion of the tasks;
however, as more tasks are set to the foreground, more
available bandwidth is consumed by these tasks, thus
reducing I/O performance.
4
Click
OK
.
Rescanning a Controller
You can rescan the channels of the selected controller to verify the
presence of existing devices or to recognize new devices added to a
channel.