VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN vsan.cluster_info This command produces detailed information for each node in the cluster, so for very large clusters, the amount of information produced by the commands starts to get quite large. In this environment, there is a 4-node cluster, but the output is truncated to show the first two hosts only. This output shows if Virtual SAN is enabled, whether the role is master, backup or agent, the UUIDs of the other nodes in the cluster, disk mappings and network information /ie-vcsa-03.ie.local/vsan-dc/computers> vsan.cluster_info 0 2014-11-27 14:44:02 +0000: Fetching host info from cs-ie-h04.ie.local (may take a moment) ... 2014-11-27 14:44:02 +0000: Fetching host info from cs-ie-h03.ie.local (may take a moment) ... 2014-11-27 14:44:02 +0000: Fetching host info from cs-ie-h02.ie.local (may take a moment) ... 2014-11-27 14:44:02 +0000: Fetching host info from cs-ie-h01.ie.local (may take a moment) ... Host: cs-ie-h02.ie.local Product: VMware ESXi 6.0.0 build-2305723 VSAN enabled: yes Cluster info: Cluster role: agent Cluster UUID: 529ccbe4-81d2-89bc-7a70-a9c69bd23a19 Node UUID: 54196e13-7f5f-cba8-5bac-001517a69c72 Member UUIDs: ["54188e3a-84fd-9a38-23ba-001b21168828", "545ca9af-ff4b-fc84-dcee-001f29595f9f", "5460b129-4084-7550-46e1-0010185def78", "54196e13-7f5f-cba8-5bac-001517a69c72"] (4) Node evacuated: no Storage info: Auto claim: no Checksum enforced: no Disk Mappings: SSD: HP Serial Attached SCSI Disk (naa.600508b1001c577e11dd042e142a583f) - 186 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001c19335174d82278dee603) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001ca36381622ca880f3aacd) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001cb2234d6ff4f7b1144f59) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001c0cc0ba2a3866cf8e28be) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001c07d525259e83da9541bf) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001c10548f5105fc60246b4a) - 136 GB, v1 FaultDomainInfo: Not configured NetworkInfo: Adapter: vmk2 (172.32.0.2) Host: cs-ie-h03.ie.local Product: VMware ESXi 6.0.0 build-2305723 VSAN enabled: yes Cluster info: Cluster role: agent Cluster UUID: 529ccbe4-81d2-89bc-7a70-a9c69bd23a19 Node UUID: 5460b129-4084-7550-46e1-0010185def78 Member UUIDs: ["54188e3a-84fd-9a38-23ba-001b21168828", "545ca9af-ff4b-fc84-dcee-001f29595f9f", "5460b129-4084-7550-46e1-0010185def78", "54196e13-7f5f-cba8-5bac-001517a69c72"] (4) Node evacuated: no Storage info: Auto claim: no Checksum enforced: no Disk Mappings: SSD: HP Serial Attached SCSI Disk (naa.600508b1001c9c8b5f6f0d7a2be44433) - 186 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001ceefc4213ceb9b51c4be4) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001cd259ab7ef213c87eaad7) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001c2b7a3d39534ac6beb92d) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001cb11f3292fe743a0fd2e7) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001c1a7f310269ccd51a4e83) - 136 GB, v1 MD: HP Serial Attached SCSI Disk (naa.600508b1001c9b93053e6dc3ea9bf3ef) - 136 GB, v1 FaultDomainInfo: Not configured NetworkInfo: Adapter: vmk2 (172.32.0.3) This is a useful command to get a “big picture” of the cluster. Useful information such as the number of nodes in the cluster (4 as per Member UUIDs) is displayed. 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 / 82
Diagnostics and Troubleshooting Reference Manual – Virtual SAN This command in 6.0 has some additional information not in the 5.5 versions; namely information on whether the node is evacuated and whether fault domains has been configured. Note: Although the output also reports emulated checksums in version 6.0, emulated checksums are not yet supported. A note of fault domains In Virtual SAN 5.5, when deploying a virtual machine with a NumberOfFailuresToTolerate = 1, there were 2n + 1 hosts required (where n = NumberOfFailuresToTolerate. This meant that if we wished to tolerate 1 failure, 3 ESXi hosts were required. If we wished to tolerate 2 failures, then 5 hosts were required and if we wished the virtual machine to tolerate 3 failures (maximum), then 7 hosts were required. NumberOfFailuresToTolerate Number of hosts required 1 3 2 5 3 7 The same hosts true in Virtual SAN 6.0 when fault domains are not enabled. However if fault domains are enabled, this allows hosts to be grouped together to form a fault domain. What this means is that no two copies/replicas of the virtual machine’s data will be placed in the same fault domain. To calculate the number of fault domains required to tolerate failures, we can use the same equation as before; when deploying a virtual machine with a NumberOfFailuresToTolerate = 1 on a cluster with fault domains, 2n + 1 fault domains (containing 1 or more hosts is required). NumberOfFailuresToTolerate Number of fault domains required 1 3 2 5 3 7 This is possibly the most important of all the commands for checking the state of the cluster. 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 / 83
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VSAN-Troubleshooting-Reference-Manual

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