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# View service levels

A service level is the response time target for the storage group.

## Prerequisites

## About this task

The service level allows you set the storage array with the desired response time target for the storage group. It automatically monitors and adapts to the workload in order to maintain (or meet) the response time target. The service level includes an optional workload type so you can further tune expectations for the workload storage group to provide enough flash to meet your performance objective.

All Flash arrays display headroom in IOPS along with the capacity headroom in GB. Behavior of pre-9.0 hybrid arrays remains the same (headroom is displayed in GBs only). If the IOPS headroom is not available, only the GB headroom is displayed at the top without the dropdown option. Both the headroom option is available only when WLP has processed data at least once.

Each service level card shows the service level name (display name if it has been renamed), the expected average response time (in millisecond). Available headroom is displayed for pre-9.0 hybrid arrays.

For pre-9.0 hybrid arrays, clicking and selecting a card displays a table. The table gives more details for different workload types available for each service level. The None workload type is selected by default.

The details table is only visible for FBA service levels. For pre-9.0 all flash arrays, the information previously in the table has been merged into the card information. For 9.0 and above arrays, Since there are no workload types, the table has been removed and all the information in the table has been moved up to the card.

The columns in the table include workload type, target response time, headroom, I/O density, I/O size, write %, skew and usage count for each workload type. All columns are sortable and all columns (except workload type) can be hidden.

Hover near the write % to view a pop-out showing more details on the mixture and similarly hover near the skew % to view a pop-out showing more details about the skew.

The service level view for All Flash arrays has been updated to display Compliance Range (RT range) for each service level and storage group information that is associated with each service level.

The Service Level view for all flash arrays (9.0 and later PowerMax and pre-9.0 250F/450F/950F) displays information about the front of the card with an ability to view more information by flipping to view the back of the card.

The front of the card displays the compliance range for each service level and total number of storage groups that are associated with that service level and number of storage groups in each compliance state - stable, marginal, and critical.

- Stable - Observed wait time weighted response time is better than the maximum response time allowed by the assigned service level for both of these periods (most recent 4 hours and most recent 2 weeks).
- Marginal - Observed response time for one of these two periods is worse than the maximum service level response time.
- Critical - Observed response time for both of these periods is worse than the maximum service level response time.

Average response time and workload type (where available) are also displayed along with the option to edit service level name.

## Steps

1. Select the storage system.
2. Select STORAGE > Service Levels to open the Service Level view.
   For all-flash storage systems running HYPERMAX OS 5977, the only service level available is Diamond.

   Available service levels are displayed in card format.

3. For storage systems running PowerMaxOS 5978 Q319 SR or later, select the Remaining Headroom measurement unit (IOPS or GB).
   The remaining headroom value is displayed.
4. Optional: In a mixed FBA/CKD environment, select the emulation type from the Emulation List dropdown menu.
   The service levels available update automatically.

   If the emulation type is set to CKD, the Workload Types tab is not available.

5. Optional: To rename a service level, hover over the service level card and click . Type the new name over the existing name and click to complete the renaming process. To cancel the renaming, click .
6. Optional: To provision storage using a service level, select the service level card and a corresponding workload type and click Provision.
   The Provision Storage wizard is displayed, with the service level and the workload type populated by default. For CKD Provisioning wizard, only the service level is selected by default. For more information about using the wizard, see The Provision Storage wizard.
7. Optional: Click Show Details to view the service level workload details (see View service level workload details).