> Services > Logical Drives > Logical Drive (VMware) Service

Logical Drive (VMware) Service

The Logical Drive (VMware) service monitors the status of a logical drive on an ESXi server.

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. For instructions on installing the Dell or HP Offline Bundle, refer to the following articles in the MSP N-central online knowledge base:

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. For instructions on installing the Dell or HP Offline Bundle, refer to the following articles in the MSP N-central online knowledge base:

  • KBA10019: Installing the HP Offline Bundle on ESX/ESXi Servers
  • KBA10020: Installing the Dell Offline Bundle on ESX/ESXi Servers

A Logical Drive, also referred to as a Storage Adapter, represents a drive, either local or available through a SAN, that an ESXi server access. When a Guest issues a read or write command, that command the VMware kernel must first processs and then the physical drive itself. 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

ESX or ESXi 4.x, 5.x and later

ESXi 3.5 is not supported.

Device Class

Server - ESXi

Monitored By

Windows Probes

Scan Interval

5 minutes

Logical Drive Name

The name of the logical drive to be monitored.

To access information on the logical drives on your ESXi server, use a browser to access the following URL:

https://<insert_IP_address_of_ESXi_server_here>/mob/?moid=ha-host&doPath=runtime.healthSystemRuntime.hardwareStatusInfo.storageStatusInfo

https://192.168.101.207/mob/?moid=ha-host&doPath=runtime.healthSystemRuntime.hardwareStatusInfo.storageStatusInfo

Metric Name Description
Read Latency (msec) Average amount of time to complete read from the physical device.
Write Latency (msec) Average amount of time to write to the physical device (LUN).
Disk Commands Number of SCSI commands issued during the collection interval.
Aborted Disk Commands 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 Number of SCSI-bus reset commands issued during the collection interval.
Device Latency (msec) Average amount of time to complete a SCSI command from the physical device.
Kernel Latency (msec) Average amount of time spent by VMkernel processing each SCSI command.
Queue Latency (msec) Average amount of time spent in the VMkernel queue, per SCSI command, during the collection interval.
Total Latency (msec) 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.