Information Technology Reference
In-Depth Information
The I/O Imbalance Threshold controls the aggressiveness of the SDRS algorithm. As the
slider is moved toward Aggressive and the counter increases, this moves up the priority
of the recommendation that will be automatically acted on when SDRS is run ning in Fully
Automated mode.
Minimum Space Utilization Difference is a slider bar that lets you specify how much of
an improvement SDRS should look for before making a recommendation or performing a
migration. The setting defaults to 5 percent. This means that if the destination's values are
5 percent lower than the source's values, SDRS will make the recommendation or perform
the migration.
In addition to the rudimentary schedule control that controls how often SDRS evaluates I/O
and space utilization, you can create more complex scheduling settings.
Configuring or Modifying the Storage DRS Schedule
The Schedule Storage DRS button next to the Edit button allows you to create custom sched-
ules. These custom schedules enable vSphere administrators to specify times when the SDRS
behavior should be different. For example, are there times when SDRS should be running in No
Automation (Manual Mode)? Are there times when the space utilization or I/O latency thresh-
olds should be different? If so, and you need SDRS to adjust to these recurring differences, you
can accommodate that through custom SDRS schedules.
Let's look at an example. Let's say that you normally have SDRS running in Fully Automated
mode, and it works i ne. However, at night, when backups are running, you want SDRS not to
automatically perform storage migrations. Using a custom SDRS schedule, you can tell SDRS to
switch into manual mode during certain times of the day and days of the week and then return
into Fully Automated mode when that day/time period is over.
Perform the following steps to create a custom SDRS schedule:
1. If it's not already running, launch the Web Client.
2. Navigate to the Storage view.
3. Right-click a datastore cluster and select Settings.
4. Select Schedule Storage DRS from the pane on the right. This opens the Edit Storage DRS
Settings (scheduled) Wizard.
5. Select the settings that you want to activate for this schedule. Click Scheduling options
on the left to continue.
6. Provide a task name and a task description. Now click the Change hyperlink to set the
schedule.
7. Specify the time when this custom schedule task should be active.
For example, if you needed to change SDRS behavior while backups are running in the
middle of the night, you could select Setup A Reoccurring Schedule For This Action and
set the time to 10:00 PM weekly. Then you select the check box for every weekday and
click OK to close the Scheduler.
8. Review the settings. Click OK if they are correct.
Search WWH ::




Custom Search