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In very rare conditions, ESXi hosts with NVIDIA vGPU-powered virtual machines might intermittently fail with a purple diagnostic screen with a kernel panic error. The issue might affect multiple ESXi hosts, but not at the same time. In the backlog, you see kernel reports about heartbeat timeouts against CPU for x seconds and the stack informs about a P2M cache.
If you use a VDS of version earlier than 6.6 on a vSphere 7.0 Update 1 or later system, and you change the LAG hash algorithm, for example from L3 to L2 hashes, ESXi hosts might fail with a purple diagnostic screen.
In systems with vSphere Distributed Switch of version 6.5.0 and ESXi hosts of version 7.0 or later, when you change the LACP hashing algorithm, this might cause an unsupported LACP event error due to a temporary string array used to save the event type name. As a result, multiple ESXi hosts might fail with a purple diagnostic screen.
In rare cases, in an asynchronous read I/O containing a SCATTER_GATHER_ELEMENT array of more than 16 members, at least 1 member might fall in the last partial block of a file. This might lead to corrupting VMFS memory heap, which in turn causes ESXi hosts to fail with a purple diagnostic screen.
If you had NSX for vSphere with VXLAN enabled on a vSphere Distributed Switch (VDS) of version 7.0 and migrated to NSX-T Data Center by using NSX V2T migration, stale NSX for vSphere properties in the VDS or some hosts might prevent ESXi 7.x hosts updates. Host update fails with a platform configuration error.
When a VIB install, upgrade, or remove operation immediately precedes an interactive or scripted upgrade to ESXi 7.0 Update 3 by using the installer ISO, the ConfigStore might not keep some configurations of the upgrade. As a result, ESXi hosts become inaccessible after the upgrade operation, although the upgrade seems successful. To prevent this issue, the ESXi 7.0 Update 3 installer adds a temporary check to block such scenarios. In the ESXi installer console, you see the following error message: Live VIB installation, upgrade or removal may cause subsequent ESXi upgrade to fail when using the ISO installer.
Disabling and re-enabling vSphere HA during remediation process of a cluster, may fail the remediation process due to vSphere HA health checks reporting that hosts don't have vSphere HA VIBs installed. You may see the following error message: Setting desired image spec for cluster failed.
If you automate the firewall configuration in an environment that includes multiple ESXi hosts, and run the ESXCLI command esxcli network firewall unload that destroys filters and unloads the firewall module, the hostd service fails and ESXi hosts lose connectivity.
If you use a beta build of ESXi 7.0, ESXi hosts might fail with a purple diagnostic screen during some lifecycle operations such as unloading a driver or switching between ENS mode and native driver mode. For example, if you try to change the ENS mode, in the backtrace you see an error message similar to: case ENS::INTERRUPT::NoVM_DeviceStateWithGracefulRemove hit BlueScreen: ASSERT bora/vmkernel/main/dlmalloc.c:2733 This issue is specific for beta builds and does not affect release builds such as ESXi 7.0.
If you upgrade your ESXi hosts to version 7.0 Update 3, but your vCenter Server is of an earlier version, and you enable TPM, ESXi hosts fail to pass attestation. In the vSphere Client, you see the warning Host TPM attestation alarm. The Elliptic Curve Digital Signature Algorithm (ECDSA) introduced with ESXi 7.0 Update 3 causes the issue when vCenter Server is not of version 7.0 Update 3.
If a secondary site is 95% disk full and VMs are powered off before simulating a secondary site failure, during recovery some of the virtual machines fail to power on. As a result, virtual machines become unresponsive. The issue occurs regardless if site recovery includes adding disks or ESXi hosts or CPU capacity.
If you try to enable the netq_rss_ens parameter when you configure an enhanced data path on the nmlx5_core driver, ESXi hosts might fail with a purple diagnostic screen. The netq_rss_ens parameter, which enables NetQ RSS, is disabled by default with a value of 0.
Starting with vSphere 7.0 Update 3, the inbox i40enu network driver for ESXi changes name back to i40en. The i40en driver was renamed to i40enu in vSphere 7.0 Update 2, but the name change impacted some upgrade paths. For example, rollup upgrade of ESXi hosts that you manage with baselines and baseline groups from 7.0 Update 2 or 7.0 Update 2a to 7.0 Update 3 fails. In most cases, the i40enu driver upgrades to ESXi 7.0 Update 3 without any additional steps. However, if the driver upgrade fails, you cannot update ESXi hosts that you manage with baselines and baseline groups. You also cannot use host seeding or a vSphere Lifecycle Manager single image to manage the ESXi hosts. If you have already made changes related to the i40enu driver and devices in your system, before upgrading to ESXi 7.0 Update 3, you must uninstall the i40enu VIB or Component on ESXi, or first upgrade ESXi to ESXi 7.0 Update 2c.
If you try to enable or reconfigure a vSphere Trust Authority cluster on a vCenter Server system of version 7.0 Update 3 with ESXi hosts of earlier versions, encryption of virtual machines on such hosts fails.
If vCenter Server services are deployed on custom ports in an environment with enabled vSAN, vSphere DRS and vSphere HA, remediation of vSphere Lifecycle Manager clusters might fail due to a vSAN resource check task error. The vSAN health check also prevents ESXi hosts to enter maintenance mode, which leads to failing remediation tasks.
If you start an operation to apply or remove NSX while adding multiple ESXi hosts by using a vSphere Lifecycle Manager image to a vSphere HA-enabled cluster, the NSX-related operations might fail with an error in the vSphere Client such as: vSphere HA agent on some of the hosts on cluster is neither vSphere HA master agent nor connected to vSphere HA master agent. Verify that the HA configuration is correct. The issue occurs because vSphere Lifecycle Manager configures vSphere HA for the ESXi hosts being added to the cluster one at a time. If you run an operation to apply or remove NSX while vSphere HA configure operations are still in progress, NSX operations might queue up between the vSphere HA configure operations for two different ESXi hosts. In such a case, the NSX operation fails with a cluster health check error, because the state of the cluster at that point does not match the expected state that all ESXi hosts have vSphere HA configured and running. The more ESXi hosts you add to a cluster at the same time, the more likely the issue is to occur.
If a cluster has ESXi hosts with enabled lockdown mode, remediation operations by using the vSphere Lifecycle Manager might skip such hosts. In the log files, you see messages such as Host scan task failed and com.vmware.vcIntegrity.lifecycle.EsxImage.UnknownError An unknown error occurred while performing the operation..
If you manually add a certificate to the vCenter Server JRE truststore or modify the /etc/hosts file when setting up ADFS, the changes are not preserved after restoring and might cause ADFS logins to fail.
A rare race condition in the qedentv driver might cause an ESXi host to fail with a purple diagnostic screen. The issue occurs when an Rx complete interrupt arrives just after a General Services Interface (GSI) queue pair (QP) is destroyed, for example during a qedentv driver unload or a system shut down. In such a case, the qedentv driver might access an already freed QP address that leads to a PF exception. The issue might occur in ESXi hosts that are connected to a busy physical switch with heavy unsolicited GSI traffic. In the backtrace, you see messages such as:
In rare cases, while the vSphere Replication appliance powers on, the hostd service might fail and cause temporary unresponsiveness of ESXi hosts to vCenter Server. The hostd service restarts automatically and connectivity restores.
ESXi hosts might become unresponsive to vCenter Server even when the hosts are accessible and running. The issue occurs in vendor images with customized drivers where ImageConfigManager consumes more RAM than allocated. As a result, repeated failures of ImageConfigManager cause ESXi hosts to disconnect from vCenter Server. In the vmkernel logs, you see repeating errors such as: Admission failure in path: host/vim/vmvisor/hostd-tmp/sh.:python.:uw.. In the hostd logs, you see messages such as: Task Created : haTask-ha-host-vim.host.ImageConfigManager.fetchSoftwarePackages-, followed by: ForkExec(/usr/bin/sh) , where identifies an ImageConfigManager process.
If you change the DiskMaxIOSize advanced config option to a lower value, I/Os with large block sizes might get incorrectly split and queue at the PSA path. As a result, ESXi hosts I/O operations might time out and fail.
During or after an upgrade to ESXi 7.0 Update 2, the ESX storage layer might not allocate sufficient memory resources for ESXi hosts with a large physical CPU count and many storage devices or paths connected to the hosts. As a result, such ESXi hosts might fail with a purple diagnostic screen.
During 24-hour sync workflows of the vSphere Distributed Switch, vCenter Server might intermittently remove NSX-controlled distributed virtual ports such as the Service Plane Forwarding (SPF) port, from ESXi hosts. As a result, vSphere vMotion operations of virtual machines might fail. You see an error such as Could not connect SPF port : Not found in the logs. 59ce067264