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Physical Disk Health – Physical Disk Health Retrieval Issues In Virtual SAN cluster, there is one more common issue is the Virtual SAN health test failing to retrieve the Physical Disk Health on an ESXi host.It is informing the administrator that it cannot get physical disk-related information from the ESXi host in question in order to perform a check on the health of the physical disks. If the Virtual SAN management service vsanmgmtd on the ESXi host is nonresponsive then you will encounter this issue, in the vsanmgmt.log you will see the following snippets, ++++++++++++++++++++++++++++++++++++++++++++ [root@esxihost-1:/var/log] cat vsanmgmt.log  2017-11-15T03:08:46Z VSANMGMTSVC: INFO vsanperfsvc[Thread-1] [VsanLsomHealth::getHealthStats] Get issued comps = {}  2017-11-15T03:08:46Z VSANMGMTSVC: WARNING vsanperfsvc[Thread-1] [VsanHealthUtil::InvokeMethod] Invoke: mo=ServiceInstance, info=RetrieveContent  2017-11-15T03:08:46Z VSANMGMTSVC: ERROR vsanperfsvc...

Failure States of Virtual SAN Components: Virtual SAN  handles failures of the host, network and storage devices in the cluster based on the severity of the failure. When these fail they directly affect the components in the  vSAN cluster.  Virtual SAN has 2 types of failure states for components ABSENT and DEGRADED. According to the component state, it uses different approaches to recover the affected components. Degraded: "A component is in degraded state if Virtual SAN detects a permanent component failure and assumes that the component is not going to recover to working state." Absent: "A component is in absent state if Virtual SAN detects a temporary component failure where the component might recover and restore its working state." An ABSENT state may or not resolve itself over time, but a  DEGRADED state is a permanent state. From the above image, left side a disk has been unplugged or offline may be reinserted or brought online, Vir...

If you are running VMware vSAN 6.0, 6.1 and 6.2 then there is a high chance that you will be seeing this issue with the following RAID controllers, Cisco 12G SAS Modular Raid Controller DELL FD332-PERC (Dual ROC) DELL FD332-PERC (Single ROC) DELL PERC H730 Adapter DELL PERC H730 Mini ==> We are using with Dell R620/630 serves with this RAID controller DELL PERC H730P Adapter  DELL PERC H730P Mini Huawei Technologies Co. Ltd. SR 430C Lenovo ThinkServer RAID 720i AnyRAID Adapter Lenovo ThinkServer RAID 720ix AnyRAID Adapter Lenovo ServeRAID 5210e SAS/SATA Controller Lenovo ServeRAID M5210 SAS/SATA Controller LSI MegaRAID SAS 9361-8i LSI MegaRAID SAS 9362-8i Supermicro SMC3108 But this can happen due to Physical Disk Drive failure and RAID Controllers from above list resetting the Disk Drives. In some scenario only one disk group will go to unhealthy state or all the disk groups will go to unhealthy state on the ESXi host in the vSAN cluster....