All posts in category ESXi

The OVF package is invalid and cannot be deployed.

While deploying a random OVF image within vSphere I received the following error message: The provided network mapping between OVF networks and the system network is not supported by any host.

Unresponsive/BSOD VM’s on ESXi 5.1 and 5.5

Since a few days I got several customers complaining about unresponsive or blue screening VM’s (both Windows 2008 and 2012) on ESXi5.1 and 5.5 environments. Troubleshooting at the customer site pointed out that the vnetflt.sys driver was causing these issues. This driver is part of the vShield Endpoint components that are installed whenever you a) explicitly […]

BL460c Gen8: Not detecting SD-Card during ESXi 5.1 Installation

While installing new HP BL460c Gen8’s (Xeon E5-2680 v2) we discovered some strange behavior while setting the HP Power Profile setting to “Maximum Performance”. It appears that this setting causes the ESXi 5.1 Installer to not see the Internal SD-Card as storage device anymore. Default BIOS Settings give us this, which is good:

Auto Deploy: ESXi Stateful Install with multiple LUNs connected fails

Recently I have been experiencing some troubles with VMware Host Profiles, Auto Deploy and the stateful install of ESXi 5.1 (Update 1). After the Host Profile gets applied, the system eventually times out with the message: “The request failed because the remote server took too long to respond” as indicated on the screenshot below.

ESXi Hostname lookup with DHCP/DNS

Within this article I will share some of the challenges faced while implementing a VMware Auto Deploy environment with DHCP for the  Management Network. The environment uses an Infoblox DHCP/DNS appliance but contains  some good-to-know things that are not Infoblox specific, so keep on reading. DHCP is configured to use mac-address reservations to ensure that […]

Random ESXi LUN loss in an 8Gb FC Brocade infrastructure

Recently Dennis Agterberg, a fellow contractor, experienced some major issues with random LUN loss on all his ESXi Hosts. The environment consists of HP Virtual Connect FC modules connected to 8Gb Brocade switches. From a vCenter perspective repetitive “lost access to volume … due to connectivity issues. Recovery attempt is in progress and outcome will […]

Running scripts on the ESXi shell with correct time-stamps

While working on the ESXi shell you might notice that the “date” command returns the UTC time instead of displaying the correct time zone like ESX Classic does. This is by design within ESXi and stated in this VMware KB article: ESXi uses UTC time and does not support changing time zones Although it’s not supported to […]

How to get Device Identifiers for I/O Devices

Recently I got a few questions about the VMware HCL and how to verify I/O devices without knowing all the key details of  the device. Let’s start of by looking at the VMware HCL, note that there are additional fields on which a search can be done for I/O Devices. The Device Identifiers are separated into the following items: VID […]

BIOS settings in a VMware ESX(i)/vSphere Environment

Over the last period I’ve noticed that a lot of customers aren’t aware of BIOS settings that can be changed as a best practice for VMware ESX(i)/vSphere environments. In this article I want to outline some of these best practices specifically based on HP Hardware, but feature-like options are available within other vendors as well. […]

Automating ESXi Deployment with UDA 2 and bash script

Recently I’ve been asked to deploy a huge amount of ESXi 4.1 Hosts using the Ultimate Deployment Appliance (UDA 2). Let’s start off by saying that the UDA is a fantastic tool but for mass deployment without user-intervention you really don’t want to manually create a template for each host and you  so I figured that bash scripts could help […]