Logical Drive (VMware) service
The Logical Drive (VMware) service monitors the status of a logical drive on an ESXi server.
N-able N-central uses the Common Information Model (CIM) services and ports for monitoring.
If your ESX/ESXi server is operating on either Dell or HP hardware, it is strongly recommended that you install the Dell or HP Offline Bundle before the Windows probe discovers the ESX/ESXi server.
A Logical Drive, also referred to as a Storage Adapter, represents a drive, either local or available through a SAN, that an ESXi server accesses. When a Guest issues a read or write command, the command processes the logical drive first, then the physical drive. The Logical Drive (VMware) service provides in-depth monitoring of that process including:
- How long the ESXi kernel takes to process read and write commands, which may indicate a CPU issue on the host.
- How long the physical drive takes to process read and write commands, which may indicate an overloaded/under-performing physical drive.
- Whether any read/write commands that have been issued were aborted because the ESXi server itself was unable to process them in time.
This service cannot use Self Healing.
| Service Type | ESXi |
| Instances on a Device | 100 |
| Supported Systems/Applications | ESXi 6.x and later |
| Device Class | Server - ESXi |
| Monitored By | Windows probes |
| Scan Interval | 5 minutes |
| Logical Drive Name | The name of the monitored logical drive. |
To access information on the logical drives on your ESXi server, use a browser to access the following URL:
https://<IP_address_of_ESXi_server>/mob/?moid=ha-host&doPath=runtime.healthSystemRuntime.hardwareStatusInfo.storageStatusInfo
Note that the Managed Object Browser (MOB) by default may be disabled and you may need to enable this feature.
| Metric Name | Description |
|---|---|
| Read Latency (msec) | The average amount of time to complete read from the physical device. |
| Write Latency (msec) | The average amount of time to write to the physical device (LUN). |
| Disk Commands | The number of SCSI commands issued during the collection interval. |
| Aborted Disk Commands | The number of SCSI commands aborted during the collection interval. |
| Data Transferred (MB) | The amount of data transferred from the logical drive. |
| Data Received (KB) | The amount of data received by the logical drive. |
| Bus Resets | The number of SCSI-bus reset commands issued during the collection interval. |
| Device Latency (msec) | The average amount of time to complete a SCSI command from the physical device. |
| Kernel Latency (msec) | The average amount of time spent by VMkernel processing each SCSI command. |
| Queue Latency (msec) | The average amount of time spent in the VMkernel queue, per SCSI command, during the collection interval. |
| Total Latency (msec) | The highest latency value across all disks used by the host. Latency measures the time taken to process a SCSI command issued by the guest OS to the virtual machine. The kernel latency is the time VMkernel takes to process an IO request. The device latency is the time it takes the hardware to handle the request. |