vsphere-esxi-vcenter-server-55-storage-guide

vSphere StorageMonitor SSD DevicesYou can monitor certain critical SSD parameters, including Media Wearout Indicator, Temperature, andReallocated Sector Count, from an ESXi host.Use the esxcli command to monitor SSD devices.In the procedure, --server=server_name specifies the target server. The specified target server prompts youfor a user name and password. Other connection options, such as a configuration file or session file, aresupported. For a list of connection options, see Getting Started with vSphere Command-Line Interfaces.PrerequisitesInstall vCLI or deploy the vSphere Management Assistant (vMA) virtual machine. See Getting Started withvSphere Command-Line Interfaces. For troubleshooting, run esxcli commands in the ESXi Shell.ProcedureuRun the following command to display the SSD statistics:esxcli server=server_name storage core device smart get -d=SSD device_IDIdentify SSD DevicesYou can identify the SSD devices in your storage network.PrerequisitesBefore you identify an SSD device, ensure that the device is tagged as SSD.Procedure1 List the devices.esxcli storage core device listThe command output includes the following information about the listed device.Is SSD: true2 Verify whether the value of the flag Is SSD is true.Identifying a Virtual SSD DeviceESXi allows operating systems to auto-detect VMDKs residing on SSD datastores as SSD devices.To verify if this feature is enabled, guest operating systems can use standard inquiry commands such asSCSI VPD Page (B1h) for SCSI devices and ATA IDENTIFY DEVICE (Word 217) for IDE devices.For linked clones, native snapshots, and delta-disks, the inquiry commands report the virtual SSD status ofthe base disk.Operating systems can auto-detect a VMDK as SSD under the following conditions:• Detection of virtual SSDs is supported on ESXi 5.x hosts and Virtual Hardware version 8 or later.• Detection of virtual SSDs is supported only on VMFS5 or later.• If VMDKs are located on shared VMFS datastores with SSD device extents, the device must be markedas SSD on all hosts.• For a VMDK to be detected as virtual SSD, all underlying physical extents should be SSD-backed.168 VMware, Inc.