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
VNX guidelines
● <10msec — Great
● 10-20 msec — Decent
● 20-100 msec — Not so great
● >100 msec — Poor performance
● High latency could cause forced flushes due to lack of available cache to buffer writes.
Symmetrix guidelines
● <1 msec — Great
● 1-10 msec — Decent
● 10-50 msec — Not so great
● >50 msec — Poor performance
● For Symmetrix arrays, performance can be impacted by Write Pending (WP) limits when there is a lack of available free
cache slots to accept incoming writes forcing the array to proactively flush pages to disk. Running SRDF sessions might also
affect performance.
Corrective actions
● Check back-end errors: These indicate that metro node had to abort and re-try operations. Could be a back-end fabric
and/or storage array health issue.
● Examine the back-end fabric for its overall health state, recent changes, reported errors, and properly negotiated speeds.
● Examine the back-end storage array for general health state, and that performance best practices are followed for disk/
RAID layout when needed.
● Utilize available performance monitoring tools from the storage-array vendor to confirm the array's performance: Additional
metrics available to the array not visible to metro node may shed light on the problem.
● Be sure to run the recommended storage array firmware version. Check for newer software releases and known bug fixes.
● Engage your storage array vendor's performance specialists if the problem persists.
Changing the view
Use the following appropriate selection criteria to filter the data:
● Read — Displays latency statistics pertaining to reads only.
● Write — Displays latency statistics pertaining to writes only.
● Director — Displays data for all directors or a specific director in the cluster.
Viewing the Backend Latency chart
1. From the GUI main menu, click Performance.
2. In the Performance Dashboard, select the tab in which you want to display the Back-end Latency chart (or create a custom
tab).
3. Click +Add Content.
4. Click the Back-end Latency chart icon.
CPU utilization chart
The CPU Utilization chart provides a time-based view of the utilization load on the director CPUs of your metro node system.
By default, the chart shows an averaged view of the utilization loads of all of the CPUs on all the directors in your metro node
system. This category is typically the first one to check for problems. When the CPU reaches 100% busy, its I/O processing
capability will also peak.
If your CPU utilization is running near 100% at all times, you have no spare capacity to handle a peak load. In applications
that are latency-sensitive and require fast response times, high director CPU usage can reduce response times even though
throughput and I/O processing capability might stay constant. Spikes in CPU utilization typically correlate to increased I/O load,
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Monitoring the system