Browse incidents, troubleshooting guides, AI diagnostics, verified fixes and community discussions related to Virtualization.
## Environment Proxmox VE 7.x cluster. Backups created with vzdump and restored to different nodes for quick recovery/testing. Network model is default LXC veth with MAC sometimes specified in config as 'hwaddr:'. Switching node and restore automati...
## Environment vSphere ESXi 7.0 hosts (3-node cluster) backed by SAN LUNs presented via iSCSI; storage array firmware upgraded overnight; several VMs stored on upgraded datastores; HA enabled; one host shows disconnected state briefly during upgrade...
## Environment Proxmox KVM host (Linux 5.15), Mellanox/Intel dual-port 25Gb NIC; firmware and vendor driver updated to latest on host during maintenance. Guests use virtio-net vNICs bridged to host bond; previously ran with MTU 9000 and stable. ## ...
## Environment Docker Swarm cluster (4 manager/worker mixed roles) running Docker Engine 20.10.8 on Ubuntu 18.04 hosts. Multiple overlay networks created for different stacks; some were created manually with --subnet and custom options. Under high i...
## Environment VMware ESXi 7.0 hosts (3-node cluster) using an NFSv4.1 datastore exported by a Linux storage appliance running custom multipath driver v3.2. Recently upgraded hosts to ESXi build 19482537 and applied vendor multipath module update on...
## Environment KVM host (Ubuntu 22.04) using libvirt-managed bridges (br0). Host NIC is 10 GbE with MTU 9000. After enabling VLAN trunking on br0 and adding VLAN subinterfaces (br0.100), multiple KVM guests with virtio-net interfaces report degraded...
## Environment Small office network with two stackable switches (VendorA model S24 v2, VendorB model X48), several Linux servers (Ubuntu 22.04) and ESXi hosts connected via multi‑gig LACP trunks; MTU changed from 1500 to 9000 on VendorA and ESXi hos...
## Environment vSphere 7.0u3 environment with multiple ESXi hosts (HPE ProLiant Gen10). Standard vSwitch and distributed vSwitch in use; vMotion configured on dedicated VLAN. VMs are a mix of autogenerated MACs and a small number with manually assig...
## Environment Proxmox VE 7.3 cluster with two nodes (QEMU/KVM), VMs running Linux guests. A VM has a PCIe GPU passed through using vfio-pci (bind via resident host), no snapshots, storage on shared NFS. Live migration (qm migrate) fails with error ...
## Environment Windows 11 Pro host running Hyper‑V; external Virtual Switch is bound to the laptop's Intel AX Wi‑Fi adapter; VMs use the external switch to obtain LAN access; host frequently sleeps/resumes. ## Symptoms After the host resumes from ...