Dell Unisphere for PowerMax 10.0.1 Product Guide

Performance Impact

The performance impact operation determines whether the storage system can handle the updated service level.

The performance impact is only available when:

• The storage system is registered with the performance data processing option for statistics.
• The workloads have been processed.
• All the storage groups that are involved have a service level and SRP set.
• The target SRP does not contain only external disk groups.
• The storage system is local.
• The storage group is not in a masking view (only for the local provisioning wizard).
• An issue with one of the selected ports arises when provisioning storage and a valid Front-End Suitability score cannot be derived. Examples of issues are: A virtual port is selected, an offline port is selected, and a selected port has no negotiated speed. When an issue arises, 200.0% (not a real suitability score) is displayed. Excluding data has no impact on the 200% displayed value.

This message indicates whether the storage system can handle the updated service level. Results are indicated with either of the following:

• Indicates suitable.
• Indicates not suitable.

In both cases, results are displayed in a bar chart by component (Front End, Back End, Cache) along with a score 0 to 100. The score can be viewed by hovering the cursor over the bar. It indicates the expected availability of the components on the target storage system after the change.

The current score for the component is shown in gray, with the additional load for the component shown in green or red indicating suitability. The additional score is red if the current and additional loads total more than 100.