Performance graphs

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A performance graph displays the performance metrics for one or more resources on the storage system. You can select the resource and metrics that you want to display in the graph. Graphs can display data from the past seven days. If you select seven or more resources, an averaging graph is displayed. The graphs are refreshed automatically as new data samples are completed.

Performance graph tools

Legend

The legend in the upper right of the graph displays the resource (system, pool, or I/O port), metrics, and measurement shown in the graph. If more than one resource or metric is displayed, they are shown in different colors.

Timeline

The horizontal part of the graph displays the timeline.

To view the performance history, drag the timeline control.
To zoom in or out, use the mouse wheel.

Split screen view

To view two graphs at the same time, click the split-screen icon on the right side of the graph.
To unlink the timelines of two graphs that are displayed in the split screen view, click the unlink icon on the right side of the graph. With this option, you can adjust the timelines of each graph independently.

Preset graphs

The Performance page includes four preset graphs, which are listed in the Favorites menu. The preset graphs display system performance metrics that represent activity between hosts and the storage system.

System IOPS: The System IOPS graph displays read, write, and total requests in thousand I/O operations per second (KIOPS), averaged over one minute.
System Latency: The System Latency graph displays the response time in milliseconds (ms) for read and write I/O operations, averaged over one minute.
Note: If your storage system is connected to an IBM® Z host, the System Latency graph includes only partial end-to-end response times on a system level for count key data (CKD) volumes. If you need to view system level response times for a storage system that is connected to a IBM Z host, refer to the Resource Measurement Facility on the host.
System Bandwidth: The System Bandwidth graph displays the number of megabytes per second (MBps) for read, write, and total bandwidth, averaged over one minute.
System Cache: The System Cache graph displays two metrics: the percentage of total read I/O operations that were fulfilled from the storage system cache or memory, and the ratio of write I/O operations that were delayed because of write cache limitations. Both metrics are averaged over one minute.

Performance metrics

To open the Resources and Metrics pane, click the handle on the toolbar on the left side of the graph. After you select the resource and performance metrics that you want to monitor, the selected resource and metrics are displayed in the legend in the upper right of the graph.

System performance metrics

The system performance metrics represent activity between hosts and the storage system.

I/O

IOPS: Displays the number of processed requests in thousand I/O operations per second (KIOPS) for the selected I/O operations (read, write, and total), averaged over one minute.
Latency: Displays the response time in milliseconds (ms) for the selected I/O operations (read, write, or average of both), averaged over one minute.
Note: If your storage system is connected to an IBM Z host, the system latency metrics include only partial end-to-end response times on a system level for count key data (CKD) volumes. If you need to view system level response times for a storage system that is connected to a IBM Z host, refer to the Resource Measurement Facility on the host.
Transfer Size: The number of KBs per I/O operation (KB/operation) for the selected I/O operations (read, write, or average of both), averaged over one minute.

Bandwidth

Bandwidth: Displays the number of MBs per second (MBps) for the selected bandwidth type (read, write, or total), averaged over one minute.

Cache

Caching: Displays the percentage of read hits (read I/O operations that were fulfilled from the system cache or memory) and write delays (I/O operations that were delayed because of write cache space constraints or other conditions) during one minute.

Capacity

Used IBM Z capacity: The amount of usable capacity that is taken up by IBM Z (CKD) data. The metrics include usable, used, used (average), and provisioned data.
Used Open Systems capacity: The amount of usable capacity that is taken up by Open Systems (FB) data. The metrics include usable, used, used (average), and provisioned data.
Used IBM Z capacity by volume type: The amount of usable capacity that is taken up by IBM Z (CKD) data according to volume type. The volume types include Used (Safeguarded Copy), Used (Thin-provisioned Volumes), Used (Standard Volumes), and Used (Overhead). The metrics also include usable and provisioned data for the system.
Used Open Systems capacity by volume type: The amount of usable capacity that is taken up by Open Systems (FB) data according to volume type. The volume types include Used (Safeguarded Copy), Used (Thin-provisioned Volumes), Used (Standard Volumes), and Used (Overhead). The metrics also include usable and provisioned data for the system.
Provisioned capacity for IBM Z: The total capacity of all IBM Z (CKD) volumes in the system. The metrics include usable, maximum provisioned, and provisioned data.
Provisioned capacity for Open Systems: The total capacity of all Open Systems (FB) volumes in the system. The metrics include usable, maximum provisioned, and provisioned data.
Provisioned IBM Z capacity by volume type: The total capacity of IBM Z (CKD) volumes according to volume type. The volume types include Provisioned (Safeguarded Copy), Provisioned (Thin-provisioned Volumes), and Provisioned (Standard Volumes). The metrics also include usable and maximum provisioned data.
Provisioned Open Systems capacity by volume type: The total capacity of all Open Systems (FB) volumes according to volume type. The volume types include Provisioned (Safeguarded Copy), Provisioned (Thin-provisioned Volumes), and Provisioned (Standard Volumes). The metrics also include usable and maximum provisioned data.

Environment

Power: The power usage of the storage system, in watts.
Temperature: The average inlet temperature of the storage system, in degrees Celsius.

Array performance metrics

The array performance metrics represent activity from the device adapters and drives within the storage system.

I/O

Latency: The response time in milliseconds (ms) for the selected I/O operations (read, write, or average of both) on the I/O port, averaged over one minute.
Transfer Size: The number of KBs per I/O operation (KB/operation) for the selected I/O operations (read, write, or average of both) on the I/O port, averaged over one minute.
Bandwidth: The number of MBs per second (MBps) for the selected bandwidth type (read, write, or total) on the I/O port, averaged over one minute.
Utilization: For each array, displays the percentage of the array that is used by I/O operations.

Bandwidth

Back-end bandwidth: The number of MBs per second (MBps) for the selected bandwidth type (read, write, or total) on the I/O port, averaged over one minute.

Utilization

Utilization %: For each array, displays the percentage of the array that is used by I/O operations.

Pool performance metrics

The pool performance metrics represent activity from the device adapters and drives within the storage system.

I/O

Back-End IOPS: The number of requests that were processed on the arrays in the pool, in thousand I/O operations per second (KIOPS) for the selected I/O operation type (read, write, and total), averaged over one minute.
Back-End Latency: The response time in milliseconds (ms) for the selected I/O operations (read, write, or average of both) that were processed on the arrays in the pool, averaged over one minute.
Transfer Size: The number of KBs per I/O operation (KB/operation) for the selected I/O operations (read, write, or average of both) that were processed on the arrays in the pool, averaged over one minute.

Bandwidth

Back-End Bandwidth: The number of MBs per second (MBps) for the selected bandwidth type (read, write, or total) that was processed on the arrays in the selected pools, averaged over one minute.

Easy Tier

Data Activity: If Easy Tier monitoring is enabled for the pool, display the breakdown of capacity in each tier by the amount of activity, in gibibytes (GiB). The levels of activity in the graph include high activity, sequential activity, low activity, inactive, and available. Click the bar graph for a tier to display an area graph of data activity for that tier over time. Click the graph for a single tier to return to the main graph.
Data Movement: If Easy Tier monitoring is enabled for the pool, display the total movement of data by Easy Tier per day in gibibytes (GiB).
Data Policy: If Easy Tier monitoring is enabled for the pool, display a breakdown of data within the pool that is pinned to a tier or managed by Easy Tier. The graph includes the data that is managed by EasyTier, data that is assigned to a tier, data that is being assigned to another tier, and available data. Click the bar graph for a tier to display an area graph of data policy for that tier. Click the graph for a single tier to return to the main graph.

Capacity

Used capacity: The amount of usable capacity that is taken up by data. The metrics include usable, used, used (average), and provisioned data. The data threshold is also included.
Used capacity by volume type: The amount of usable capacity that is taken up by data according to volume type. The volume types include Used (Safeguarded Copy), Used (Thin-provisioned Volumes), Used (Standard Volumes), and Used (Overhead). The metrics also include usable and provisioned data. The data threshold is also included.
Provisioned capacity: The total capacity of all volumes in a pool. The metrics include usable, maximum provisioned, and provisioned data.
Provisioned capacity by volume type: The total capacity of all volumes in a pool according to volume type. The volume types include Provisioned (Safeguarded Copy), Provisioned (Thin-provisioned Volumes), and Provisioned (Standard Volumes). The metrics also include usable and maximum provisioned data.
Overprovisioned ratio: The ratio of provisioned capacity to usable capacity in a pool.

Volume performance metrics

Easy Tier

Data Activity: If Easy Tier monitoring is enabled for the pool that includes the volume, displays the breakdown of capacity in each tier by the amount of activity, in gibibytes (GiB). The levels of activity in the graph include high activity, sequential activity, low activity, and inactive. Click the bar graph for a tier to display an area graph of data activity for that tier over time. Click the graph for a single tier to return to the main graph.
Data Policy: If Easy Tier monitoring is enabled for the pool that includes the volume, displays a breakdown of data within the pool that is pinned to a tier or managed by Easy Tier. The graph includes the data that is managed by EasyTier, data that is assigned to a tierand data that is being assigned to another tier. Click the bar graph for a tier to display an area graph of data policy for that tier. Click the graph for a single tier to return to the main graph.

I/O

IOPS: The number of requests that are processed on the volume, in thousand I/O operations per second (KIOPS) for default I/O operations (read, write, and total). The time averaged for last hour is sampled per minute, for last day (ranging from last 1 hour to 24 hours ago) is sampled every 15 minutes, for last week (ranging from yesterday to one week ago) is sampled every hour.
Latency: Displays the response time in milliseconds (ms) for the default I/O operations (read, write, and average) that is processed on the volume. The time averaged for last hour is sampled per minute, for last day (ranging from last 1 hour to 24 hours ago) is sampled every 15 minutes, for last week (ranging from yesterday to one week ago) is sampled every hour.

Bandwidth

Bandwidth: The number of MBs per second (MBps) for the default bandwidth type (read, write, and total) that is processed on the volume. The time averaged for last hour is sampled per minute, for last day (ranging from last 1 hour to 24 hours ago) is sampled every 15 minutes, for last week (ranging from yesterday to one week ago) is sampled every hour.

Fibre Channel port performance metrics

I/O

IOPS: Displays the number of processed requests in thousand I/O operations per second (KIOPS) for the selected I/O operations (read, write, and total) on the Fibre Channel port, averaged over one minute.
Latency: Displays the response time in milliseconds (ms) for the selected I/O operations (read, write, or average of both) on the Fibre Channel port, averaged over one minute.
Transfer Size: The number of KBs per I/O operation (KB/operation) for the selected I/O operations (read, write, or average of both) on the Fibre Channel port, averaged over one minute.

Bandwidth

Bandwidth: The number of MBs per second (MBps) for the selected bandwidth type (read, write, or total) on the Fibre Channel port, averaged over one minute.

LSS

I/O

IOPS: The number of requests that are processed on the LSS, in thousand I/O operations per second (KIOPS) for the default I/O operations (read, write, and total) averaged over minute.
Latency: Displays the response time in milliseconds (ms) for the default I/O operations (read, write, and average) that is processed on the LSS, averaged over minute.

Bandwidth

Bandwidth: The number of MBs per second (MBps) for the default bandwidth type (read, write, and total) that is processed on the LSS, averaged over minute.

Host

I/O

IOPS: The number of requests that are processed on the host, in thousand I/O operations per second (KIOPS) for the default I/O operations (read, write, and total) averaged over minute.
Latency: Displays the response time in milliseconds (ms) for the default I/O operations (read, write, and average) that is processed on the host, averaged over minute.

Bandwidth

Bandwidth: The number of MBs per second (MBps) for the selected bandwidth type (read, write, and total) that is processed on the host, averaged over one minute.