The Dashboard tab displays a running graphical overview of the array's storage capacity, performance, and hardware status.
Figure 18. Dashboard Tab
Capacity Pane and Performance Graphs
The capacity pane contains a summary of the array's current virtual (provisioned) and physical storage capacity and consumption. The performance graphs, which include the Latency, IOPS, and Bandwidth graphs, display array I/O metrics in real time.
The capacity pane contains a summary of the array's virtual (provisioned) and physical storage capacity and the amount of storage occupied by data and metadata. All capacity values are rounded to two decimal places.
Figure 19. Dashboard - Capacity Pane
The capacity pane includes the following main components:
Total provisioned size of all volumes. Represents storage capacity reported to hosts.
- Total Reduction
Ratio of provisioned sectors within a volume versus the amount of physical space the data occupies after reduction via data compression and deduplication and with thin provisioning savings. Total reduction is data reduction with thin provisioning savings.
For example, a total reduction ratio of 10:1 means that for every 10 MB of provisioned space, 1 MB is stored on the array's flash modules.
- Data Reduction
Ratio of mapped sectors within a volume versus the amount of physical space the data occupies after data compression and deduplication. The data reduction ratio does not include thin provisioning savings.
For example, a data reduction ratio of 5:1 means that for every 5 MB the host writes to the array, 1 MB is stored on the array's flash modules.
- Percentage Full
Percentage of the array's physical storage space occupied by reduced data and metadata. The Percentage Full value is displayed in the green box of the capacity pane.
The capacity bar represents a visual depiction of the used and total physical storage space amounts. The colored segments of the bar represent the amounts of physical storage occupied by different types of data and metadata.
Physical space occupied by volume data that is not shared between volumes, excluding array metadata and snapshots.
Physical space occupied by data unique to one or more snapshots.
- Shared Space
Physical space occupied by deduplicated data, meaning that the space is shared with other volumes and snapshots as a result of data deduplication.
Physical space occupied by internal array metadata.
- Empty Space
Unused space available for allocation.
Physical storage space occupied by volume, snapshot, shared space, and system data.
Total physical usable space on the array.
Click the title bar of the Capacity pane to collapse and expand it.
The performance graphs display I/O performance metrics in real time.
Figure 20. Dashboard - Performance Graphs
The performance graphs include the Latency, IOPS, and Bandwidth graphs.
The Latency graph displays the average time it takes the array to process a read or write I/O request.
The "Reads" line represents the average time, measured in milliseconds, it takes the array to perform a read I/O operation. The "Writes" line represents the average time, measured in milliseconds, it takes the array to perform a write I/O operation.
The Latency graph also includes a dotted "Queue Depth" line to display the average number of queued I/O requests.
The IOPS (Input/output Operations Per Second) graph displays host I/O requests processed per second by the array. This metric counts requests per second, regardless of how much or how little data is transferred in each.
The "Reads" line represents the number of read requests processed per second. The "Writes" line represents the number of write requests processed per second. The dotted "Avg IO Size" line represents the average read/write I/O size per request processed.
The Bandwidth graph displays the number of bytes transferred per second to and from all hosts. The data is counted in its expanded form (as originally written by the hosts) rather than the reduced form stored in the array to truly reflect what is transferred over the storage network.
The "Reads" line represents the number of bytes read per second. The "Writes" line represents the number of bytes written per second.
The performance graphs display the performance metrics in real time along a scrolling graph; the incoming data appear along the right side of each graph as older numbers drop off the left side.
The values in the green boxes of each graph represent the most recent data samples added.
By default, the performance graphs display performance metrics for the past 24 hours. Click the Zoom drop-down arrow in the bottom-right corner of the window to view performance metrics from as recent as 1 hour to as far back as 30 days. Drag the Range buttons to further narrow the view to a specific range of time.
Figure 21. Dashboard - Performance Graphs (with Point-in-Time Performance Indicators)
Click the title bar of a performance graph to collapse and expand it.
Note about the Performance Graphs
The Dashboard and Analysis tabs display the same latency, IOPS, and bandwidth performance graphs, but the information is presented differently between the two tabs.
In the Dashboard tab:
The performance graphs are updated once every 30 seconds.
The performance graphs display up to 30 day's worth of historical data.
The Latency graph displays only internal latency times. SAN times are not included.
In the Analysis tab:
The performance graphs are updated once every minute.
The performance graphs display up to one year's worth of historical data.
The performance data can be further dissected by I/O type.
The Latency graph displays both internal latency times and SAN times.
The Alerts pane is divided into two sections; the Array Status section displays the operational state of the array controllers, flash modules, and NVRAM modules, and the Recent Alerts section displays a list of recent alert messages.
Figure 22. Dashboard - Alerts Pane
The Array Status section displays the operational state of the array controllers, flash modules, and NVRAM modules. To drill down and analyze the array details, click the Array Status image or select .
The Recent Alerts section displays flagged alert messages. To view alert messages, click the title. To view the details for a specific alert, click the alert name. To dismiss a message from the Recent Alerts section and clear the message flag, click next to the alert message name. After you dismiss a message, you can still view it in the view. You can also view and manage alert messages through the sub-view.