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Foglight for Storage Management Shared 4.8.5 - User and Reference Guide

Getting Started Configuring Agents to Monitor Storage Devices
Brocade SAN Switches Cisco SAN Switches Dell Compellent Arrays Dell EqualLogic PS Series Array Groups EMC CLARiiON CX Series Arrays (CLI) EMC CLARiiON, VNX, or VMAX Storage Arrays (SMI-S) EMC Isilon EMC VPLEX Hitachi Data Systems AMS, USP, and VSP HP EVA Storage Arrays HP 3PAR Arrays NetApp Filers Configuration Procedures
Managing Agents Using Foglight for Storage Management Monitoring Storage Performance Investigating Storage Devices Investigating Storage Components Investigating VPLEX Storage Troubleshooting Storage Performance Managing Data Collection, Rules, and Alarms Understanding Metrics Appendix: Collection Target Support Matrix Online-Only Topics

Investigating a LUN

A LUN (logical unit number) represents a logical SAN block storage device on an array or filer that can be exposed for mapping to a server. The data displayed in the dashboard reflects metric values for the LUN over the selected time range. This walkthrough describes the contents of each of the tabs.

To explore a LUN:
1
On a dashboard, click a LUN name or icon.
The LUN dashboard opens.
2
Review overall performance in the Summary tab.
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Details. Displays the LUN’s status, physical details, parent device and capacity metrics.
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Charts. Plot values over the time period for these metrics, if available: Ops Rate, Data Rate, Latency, % Busy, Cache Hit Rate, and Average Queue Depth.
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Pool Details. Identifies the pools to which the LUN belongs.
Non-clustered storage arrays — Displays performance and capacity metrics for the pools relevant to the selected LUN. For more information, see Performance Metrics and Capacity Metrics.
EqualLogic storage arrays—Displays the same information as the Pool Details view on the Pools-Members tab of the EqualLogic Storage Array dashboard, but the data reflects only the pools relevant to the selected LUN. For more information, see Dell EqualLogic Storage Array.
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Alarm Summary. Displays alarms on the LUN.
3
Click the Topology tab.
Displays the datastores, CSVs, or logical disks that get their physical storage from the selected LUN, the VMs that do the I/O, and if dependency processing is enabled, the (most likely) physical host connected to the LUN. For more information on dependency processing, see Inferring Physical-Host-to-Storage Relationships.

LUN providing storage to Hyper-V VMs

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Click a Cloud icon to reveal the ports and paths from disks extents to the LUN, through a particular server. For more information, see Exploring Connectivity with SAN Topology Diagrams.
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Click an icon, then select a component name to navigate to the component dashboard. For example, if you select the VM icon, you can see a list of the VMs that use the storage and select one that warrants further investigation.
4
Click the SAN Data Paths tab.
Displays the datastores or servers, CSVs or logical disks that get their physical storage from the selected LUN, and the VMs that do I/O to them and the LUN.
5
Review the I/O Paths table to assess the worst performing path segment of the possible data paths between each disk extent and the LUN during the time period. This helps you to identify bottlenecks resulting in high latency. For general information about how to use a Data Paths tab, see Exploring I/O Performance with SAN Data Paths. For information specific to the LUN Data Path tab, see below.
 
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TIP: For metrics that have thresholds, the color of the bars highlight data values that fall within normal, warning, critical, and fatal thresholds.Thresholds are set in the registry variables StSAN.FCSwitchPortUtilization.[Warning|Critical|Fatal].
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NOTE: The column headings may vary between VMware and Hyper-V. Where the names differ, the column headers will be listed for VMware and Hyper-V respectively.
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ESX/VMs or Hyper-V Server/VM. List of servers and the VMs they host.
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Latency. Average latency per operation in the time period.
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Data Rate. Average data rate for I/O from the ESX or VM to the LUN over the time period.
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% Total I/O in ESX or % Total I/O in Hyper-V Server. When multiple VMs on a server are performing I/O to the same LUN, displays the percentage of the total I/O performed by this VM.
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ESX FC Ports --> SAN Util or Hyper-V Server FC --> Ports SAN Util. Displays the busiest link (read or write utilization) over a time period. Click the cell to display all the port links. Review the topology diagram to see the ports and link utilization. Data is not available for IP ports.
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SAN --> A/F Ports Util. Displays the busiest link (read or write utilization) over the time period. Click the cell to display all the port links. Review the topology diagram to see the ports and link utilization. Data is not available for IP ports.
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% Total I/O at LUN. When VMs on multiple servers are doing I/O to the same LUN, displays the percentage of the total I/O performed by this server.
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LUN Latency (ms). Displays the latency of LUN in ms.
6
Review the diagram to understand the path from disk extents through the SAN to LUNs. The topology diagram is enhanced to show the FC ports and to display latency, link utilization, and for controllers, percent busy.
 
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NOTE: When physical hosts are inferred by dependency processing and not monitored directly by agents, the disk extents on the host that map to the selected LUN are unknown and therefore no latency values are available. For instructions on how to enable dependency processing, see Inferring Physical-Host-to-Storage Relationships.
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To investigate further:
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Click a host, VM, or virtual storage name or icon. See the Managing Virtualized Environments User and Reference Guide.
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Click a disk name or icon. See Investigating a Physical Disk.
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Click a port name or icon. See Investigating an Array/Filer Port.
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Click a controller name or icon. See Investigating a Controller.
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Click an alarm. See Assessing Storage Alarms.
Related Topics
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Introducing Storage Component Dashboards
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Exploring a Filer
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Exploring a Storage Array

Investigating a NASVolume

A NASVolume is a volume whose physical storage is on a filer or unified storage supplier. It can be mounted by an ESX host to provide the physical storage for a datastore using NFS. The data displayed in the dashboard reflects metric values for the NASVolume over the selected time range. This walkthrough describes the contents of each of the tabs.

To explore a NASVolume:
1
On a dashboard, click a NASVolume name.
The NASVolume dashboard opens.
2
Review overall performance in the Summary tab.
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Details. Displays the volume’s status, physical state, physical details, parent devices, and alarms on disks in the volume. Also displays current values for Advertised NASVolumes Size, Used Capacity, and % Used.
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Charts. Displays the following metrics over the time period:
- Data Rate. Plots values for Data Read Rate and Data Write Rate.
- Ops Rate. Plots values for Read Ops Rate, Write Ops Rate and Other Ops.
- Latency. Plots values for Read Latency and Write Latency.
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Aggregate Details. Displays values for Total Usable Capacity, Available Usable Capacity % Available, Advertised NASVolumes Size, and Overcommitment.
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Alarm Summary. Displays alarms on the NASVolume.
3
Click the Topology tab.
Displays the datastores that get their physical storage from the selected volume as a NAS mount and the VMs that do I/O to these datastores. For more details, click an icon or an entity name. For more information about using this view, see Exploring Connectivity with SAN Topology Diagrams.
4
Click the Disks tab.
Displays the disks used by the NASVolume. For more information, see Common Component Disk Tab Data.
5
To investigate further:
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Click a host, VM, or datastore name or icon. See the Managing Virtualized Environments User and Reference Guide.
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Click an alarm. See Assessing Storage Alarms.
Related Topics
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Introducing Storage Component Dashboards
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Exploring a Filer
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Investigating an Aggregate

Investigating a Physical Disk

The data displayed in the dashboard reflects values for the selected disk over the selected time range. The Physical Disk dashboard has only one tab.

To explore a physical disk:
1
On a dashboard, click a disk name.
2
Review overall performance in the Summary tab.
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Disk Details. Displays the disk’s status, physical details, parent device, and size if available.
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Physical State: Displays the physical state the of disk. It will be marked as "No Information" if the disk does not commit any performance data. To mark disks as "Removed", click on "No Information" link and confirm the disk is removed physically by pressing "Removed" button.
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NOTE: Selecting "No Information Disks" metric from Show Disks With drop down shows the disks with no metrics provided by the Agent. Selecting "Removed Disks" metric from Show Disks With drop down shows the disks manually marked as "Removed" Physical State in No Information Dialog.
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Charts. Displays the following metrics over the time period:
- Data Rate. Plots values for Data Rate, Data Read Rate, and Data Write Rate.
- Ops Rate. Plots values for Ops Rate, Read Ops Rate, and Write Ops Rate.
- Latency. Plots values for Latency, Read Latency, and Write Latency.
- Busy %. Plots values for % Busy.
- Queue Depth. Plots depth of the queue.
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Pool Details (Arrays only). Displays performance and capacity metrics for the pools to which this disk contributes resources. For more information, see Performance Metrics and Capacity Metrics. To investigate a pool, click its name. For more information, see Investigating a Pool.
EqualLogic storage arrays—Displays the same information as the Pool Details view on the Pools-Members tab of the EqualLogic Storage Array dashboard, but the data reflects only the pools relevant to the selected disk. For more information, see Dell EqualLogic Storage Array.
Isilon storage arrays—Displays the same information as the Pool Details view on the Pools tab of the Isilon Storage Array dashboard, but the data reflects only the pools relevant to the selected disk. For more information, see EMC VPLEX Storage Array.
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Aggregate Details (Filers only). Lists the aggregates to which this disk contributes resources. For each aggregate, displays its name, status, physical state, and current values for Total Usable Capacity, Available Usable Capacity % Available, Advertised NASVolumes Size, and Overcommitment. To investigate an aggregate, click its name. See Investigating an Aggregate.
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Alarm Summary. Displays alarms on the disk.
Related Topics
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Introducing Storage Component Dashboards
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Exploring a Filer
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Exploring a Storage Array

Investigating a Pool

Displays a summary of details for the selected pool, including a selection of size, capacity, data rate, and latency metrics. The data displayed in the dashboard reflects values for the pool over the selected time range.

The Pool dashboard is very similar for non-clustered storage arrays and EqualLogic storage arrays. The Isilon storage array requires its own Pool dashboard, which is discussed separately. The following walkthroughs describe the contents of each of the tabs.

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