Could not power on VM - lock was not free

The other day we experienced an incident on the SAN storage with high latency and even loss of connection to the SAN. This can generate a lot of really unpleasant errors on the ESX hosts. Even after the SAN is brought back to a stable state we've seen hosts that won't boot, VM's that won't vMotion and VMs that won't power on due to file locks. If you receive a 'locked file error' (like screendump below) and your VM won't boot there are...

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Error during upgrade: The system call API checksum doesn’t match

Today, I got an error during upgrade from vSphere 4.0 to 4.1 stating something like: The system call API checksum doesn’t matchThere was a lot of similar lines filling the console. I was a bit worried that the upgrade had gone wrong even though I had done three similar upgrades before this one with no errors - and that I would have to reinstall in stead.Luckily, I found this error description in the 4.1 release notes stating that a reboot will fix the issue. So I waited for a while to be sure that the upgrade finished, rebooted, and everything...

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ESX 4.1 install error on BL460c G7 - NIC driver fails to load

The HP BL460c G7 is on the VMware HCL list for ESX 4.1. However, when trying to install ESX 4.1 there's an error during install - it fails to load drivers for the network adapter ("No network adapters were detected"). It doesn't help to update all firmware to latest version (even though this should be done in any case...) (Update 2011.02.18: This problem persists on ESX 4.1 U1)This is a known error and there's a fix for it. However, it seems...

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