VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN If there are many devices in the list, it may not be easy to navigate. The filter option can help if you type in part of the name of the device. Fortunately, there are other ways of capturing device information other than the vSphere web client. Let’s begin by looking at per host information. Using ESXCLI to capture device info Since not everything is visible in the UI, there are options to capture the information in other ways. ESXCLI commands will give most of what is required to verify that a storage controller model is supported, as well as the driver and firmware versions. It can also be used to identify a flash device, and verify that it is also supported. esxcli storage core device list Please note that while VSAN is distributed across all nodes in the cluster, the esxcli storage commands are per-host, and do not have a global view of disks. This command is run from the CLI of an ESXi 5.5 host (there is additional detail in the 6.0 version of the command which will be looked at shortly). The command displays information about a disk drive. ~ # esxcli storage core device list naa.600508b1001c4b820b4d80f9f8acfa95 Display Name: HP Serial Attached SCSI Disk (naa.600508b1001c4b820b4d80f9f8acfa95) Has Settable Display Name: true Size: 139979 Device Type: Direct-Access Multipath Plugin: NMP Devfs Path: /vmfs/devices/disks/naa.600508b1001c4b820b4d80f9f8acfa95 Vendor: HP Model: LOGICAL VOLUME V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 26
Diagnostics and Troubleshooting Reference Manual – Virtual SAN Revision: 3.66 SCSI Level: 5 Is Pseudo: false Status: degraded Is RDM Capable: true Is Local: false Is Removable: false Is SSD: false Is Offline: false Is Perennially Reserved: false Queue Full Sample Size: 0 Queue Full Threshold: 0 Thin Provisioning Status: unknown Attached Filters: VAAI Status: unknown Other UIDs: vml.0200060000600508b1001c4b820b4d80f9f8acfa954c4f47494341 Is Local SAS Device: false Is USB: false Is Boot USB Device: false No of outstanding IOs with competing worlds: 32 eui.a15eb52c6f4043b5002471c7886acfaa Display Name: Local FUSIONIO Disk (eui.a15eb52c6f4043b5002471c7886acfaa) Has Settable Display Name: true Size: 1149177 Device Type: Direct-Access Multipath Plugin: NMP Devfs Path: /vmfs/devices/disks/eui.a15eb52c6f4043b5002471c7886acfaa Vendor: FUSIONIO Model: IODRIVE Revision: v1.0 SCSI Level: 5 Is Pseudo: false Status: on Is RDM Capable: false Is Local: true Is Removable: false Is SSD: true Is Offline: false Is Perennially Reserved: false Queue Full Sample Size: 0 Queue Full Threshold: 0 Thin Provisioning Status: yes Attached Filters: VAAI Status: unknown Other UIDs: vml.0100000000313231304430393235494f44524956 Is Local SAS Device: false Is USB: false Is Boot USB Device: false No of outstanding IOs with competing worlds: 32 There is a lot of useful information to be gleaned from this output. One can see that the magnetic disks (Is SSD: false) seems to be presented to the ESXi host from a HP controller (Vendor: HP), and we can see the flash device (Is SSD: true) seems to be presented from a Fusion-IO controller. Note that the status of the magnetic disk shown as degraded in the above output. The reason for this is because there is only a single path to the device. If there were multiple paths, then this “degraded" state is not present. This is not a concern for local disks, as in almost all local disk configurations, there will only be one path to the devices. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 27
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