Help
Table Of Contents
- Dell EMC Storage Systems Online Help for the metro node appliance
- Contents
- Figures
- Welcome
- Using the GUI
- Configuring GUI default settings
- Using storage hierarchy maps
- Viewing system status
- Monitoring the system
- Performance
- The Performance Monitoring dashboard
- Viewing a chart
- Modifying a dashboard layout
- Creating a custom dashboard
- Removing a chart
- Moving a chart
- Back-end Bandwidth Chart
- Back-end Throughput chart
- Back-end Errors chart
- Back-end Latency chart
- CPU utilization chart
- Heap Usage chart
- Front-end Queue Depth chart
- Front-end Bandwidth chart
- Front-end Latency chart
- Front-end Throughput chart
- Front-end Aborts chart
- Write Latency Delta chart
- WAN Port Performance chart
- WAN Latency chart
- Rebuild Status dashboard
- Virtual Volumes dashboard
- Front End Ports dashboard
- System Health
- Performance
- Provisioning storage
- Guide
- Provisioning from storage volumes
- Provision Job properties
- Distributed storage
- Storage arrays
- Storage volumes
- Devices
- About devices
- Using the Devices view
- The Create Devices wizard
- The Add Local/Remote Mirror wizards
- Viewing the status of IO to a device
- Creating a device
- Renaming a device
- Deleting a device
- Mirroring a device
- Device status
- Device component properties
- Device properties
- Distributed device properties
- Add capacity to virtual volumes
- Extent properties
- Extents
- Distributed devices
- About distributed devices
- The Distributed Devices view
- The Create Distributed Device from Claimed Storage Volumes wizard
- Distributed device rule sets
- Changing the rule set for a distributed device
- Creating a distributed device
- Deleting a distributed device
- Renaming a distributed device
- Distributed Device status
- Virtual volumes
- About virtual volumes
- The Virtual Volumes view
- The Distributed Virtual Volumes view
- Creating a virtual volume
- About virtual volume expansion
- Expanding a virtual volume using storage volumes
- Enabling or disabling remote access for a volume
- Manually assigning LUN numbers to volumes
- Deleting a volume
- Renaming a volume
- Tearing down a volume
- Virtual Volume status
- Pool properties
- Virtual volume properties
- Show ITLs dialog box
- Logical unit properties
- ALUA Support field values
- Visibility field values
- Extent or Device mobility job properties
- Metro node port properties
- Storage array properties
- Storage view properties
- Storage volume properties
- Create Virtual Volumes dialog box
- Consistency group
- About consistency groups
- Using the Consistency Groups view
- Distributed Consistency Groups view
- Create Consistency Group wizard
- Types of consistency groups
- Creating a consistency group
- Adding a volume to a consistency group
- Removing a volume from a consistency group
- Deleting a consistency group
- Consistency Group status
- Consistency group properties
- Step 1: Select or create a consistency group for the virtual volume
- Step 1: Create a consistency group
- Step 2: Select volume options
- Step 3: Select a storage pool
- Step 3: Select a pool for each mirror on the second cluster
- Step 3: Select a pool for each mirror in the cluster
- Step3: Create thin virtual volumes
- Select a storage view for the virtual volume(s) (optional)
- Step 5: Review your selections
- Step 6: View results
- Step 2: Select volume options
- Step 2: Select volume options
- Step 3: Select a storage volume to create the virtual volume
- Step 3: Select a source and target storage volume
- Step 3: Create thin volumes
- Step 3: Select a target storage volume on the remote cluster
- Step 3: Select target storage on the remote cluster
- Step 6: View results
- Show Logical Units
- Exporting storage
- Initiators and metro node ports
- Storage views
- About storage views
- Using the Storage Views screen
- The Create Storage View wizard
- Creating a storage view
- Deleting a storage view
- Renaming a storage view
- Adding or removing initiators from a storage view
- Adding virtual volumes to a storage view
- Removing virtual volumes from a storage view
- Adding or removing metro node ports from a storage view
- Storage view status
- Storage group properties
- Director properties
- Cluster properties
- Moving data
- Mobility
- Move Data Within Cluster
- Move Data Across Clusters
- Create Mobility Job wizards
- Mobility job transfer size
- Creating a mobility job
- Viewing job details
- Committing a job
- Canceling a job
- Pausing a job
- Resuming a job
- Removing the record of a job
- Changing a job transfer size
- Searching for a job
- Mobility job status
- Notifications
● Check if CPU utilization and front-end operations count is also high. The system might be simply at over-capacity, which
may also be reflected in this category.
● Constantly rising heap usage is a potential sign of a director memory leak. Contact Dell EMC Support to identify these
systems.
Corrective actions
● Check if CPU utilization and front-end operations count is also high. The system might be simply at over-capacity, which
may also be reflected in this category.
● Constantly rising heap usage is a potential sign of a director memory leak. Contact Dell EMC Support to identify these
systems.
Changing the view
To view the Heap usage of a single director in your metro node system, select the director name from the Director drop-down.
NOTE: The chart displays data only for the directors in the cluster to which you are currently connected. To simultaneously
view statistics for another cluster, open a second browser session and connect to the second cluster.
Viewing the Heap Usage chart
1. From the GUI main menu, click Performance.
2. In the Performance Dashboard, select the tab in which you want to display the chart (or create a custom tab).
3. Click +Add Content.
4. Click the Heap Usage chart icon.
Front-end Queue Depth chart
The Front-end Queue Depth chart provides the count of front-end operations per director. It describes the number of
concurrent outstanding operations active in the system. This statistic is not directly related to front-end IOPS. IOPS could
be easily be in the thousands range, whereas this field describes the concurrency of the operations and may be quite low,
depending upon how many I/O's the application or host have outstanding to metro node over a given time.
Guidelines
Keep in mind the following guidelines when using the Front-end Queue Depth chart:
● Normal values are approximately 10-100 concurrent operations for a small to medium system.
● Anything greater than about 500 shows a lot of concurrent access in a system but is not alarming. Check the CPU
utilization.
● > 1000 active could be indicative of a problem with metro node keeping up with host I/O demands. Check CPU utilization,
front-end aborts, and be-aborts
● This value depends heavily upon the customer workload.
Corrective actions
● Monitor CPU % busy, front-end aborts, back-end aborts, and WAN health state (in metro node Metro systems).
● If other directors in a cluster are less busy, look to balance the workload across these directors.
● SCSI CDB trace information can identify if there are large dormant queues in the front-end. This can be bad for
performance.
● For metro node Metro systems, WAN performance degradation could cause active operations to distributed-devices to not
complete as quickly as they did previously. This may result in an I/O operations queue build up, causing this counter to
increase. Check the WAN connectivity, health state, and performance.
● In VMware and certain host clustered environments, SCSI reservations could causing spikes in active operations, if there are
a lot of reservation-intensive operations (vMotion, Storage vMotion, backup, or frequent file creations/deletions).
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Monitoring the system