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VMware | 1003955
Troubleshooting LUN connectivity issues on ESXi hosts
Last update date:
4/10/2024
Affected products:
vSphere ESXi
Affected releases:
8.06.76.56.07.0
Fixed releases:
No fixed releases provided.
Description:
Purpose
This article provides troubleshooting steps when LUNs are missing: Targets on the storage array are visible but one or more LUNs are not visibleLUN not visibleLUN cannot connectLUN is missingLUN not presented
Resolution
Validate that each troubleshooting step below is true for your environment. Each step provides instructions or a link to a document, in order to eliminate possible causes and take corrective action as necessary. The steps are ordered in the most appropriate sequence to isolate the issue and identify the proper resolution. Do not skip a step. Verify that the LUN is presented to the ESXi host. You may need to contact your array vendor for assistance. Verify that the LUN is in the same storage group as all the ESXi hosts (if applicable to the array).Verify that the LUN is configured correctly for use with the ESXi host. Note: Consult the appropriate SAN configuration guide for your array (listed in the Additional Information section).Verify that the LUN is not set to read-only on the array.If you are presenting LUN IDs that are higher than 255, please ensure Disk.MaxLUN setting on the ESXi host is set higher than the range you are using. Please see: https://kb.vmware.com/s/article/1998 . Further... If you are presenting (in total) more than 255 LUNs from an array, please make sure that your HBA driver supports it, for example Cisco UCS manager has a "Max LUNs Per Target" field that is defaulted to 256, but is recommended to be 1024 for ESXi hosts. Verify that the ESXi host can see the LUNs. For more information, see Obtaining LUN pathing information for ESXi hosts (1003973) . Note: If LUNs are not visible on the ESXi host, see: For fibre channel LUNs: Troubleshooting fibre channel storage connectivity (1003680)For iSCSI LUNs: Troubleshooting ESXi connectivity to iSCSI arrays using software initiators (1003952) Verify that a rescan restores visibility to the LUN(s). For more information, see Performing a rescan of the storage on an ESXi/ESX host (1003988) and Interpreting SCSI sense codes in VMware ESX / ESXi (multiple versions) (289902). Check the storage for latency. For more information, see Using esxtop to identify storage performance issues (1008205). Verify that there are not excessive SCSI reservation conflicts. For more information, see: Resolving SCSI reservation conflicts (1002293) Note: If your problem still exists after trying the steps in this article: Gather the VMware Support Script Data. For more information, see Collecting diagnostic information for VMware products.File a support request with VMware Support and note this Knowledge Base article ID (1003955) in the problem description. For more information, see Filing a Support Request in Customer Connect (2006985).
Related Information
VMware Skyline Health Diagnostics for vSphere - FAQ"Host Connectivity Degraded in ESXi" warning in vCenter ServerFor translated versions of this article, see: 日本語: ESXi/ESX ホストの LUN 接続の問題のトラブルシューティング (2076818) "An error occurred while consolidating disks:" deleting one or more snapshots or consolidate disksUnable to create a VMFS3 partition on a metaLUN or LUSE LUNResolving SCSI reservation conflictsTroubleshooting fibre channel storage connectivityTroubleshooting iSCSI LUN connectivity issues on ESX/ESXi hostsCollecting diagnostic information in a VMware Virtual Infrastructure EnvironmentObtaining LUN pathing information for ESX or ESXi hostsPerforming a rescan of the storage on an ESX/ESXi hostInsight Manager may cause SCSI reservation conflictsUsing esxtop to identify storage performance issues for ESX / ESXi (multiple versions)ESXi 5.0 host does not boot with a new VMFS5 LUN as LUN0 on fibre channel storage arrayESXi hosts fail to mount VMFS5 volumes that are formatted with ATS-only capabilitiesHow to file a Support Request in Customer ConnectESXi/ESX ホストの LUN 接続の問題のトラブルシューティング对 ESXi/ESX 主机上的 LUN 连接问题进行故障排除Interpreting SCSI sense codes in VMware ESXi and ESXSCSI Reservation Issue with Fibre Channel HBAs
