Blocksizes of VMFS

A recent project I was working on where it was critical to change the block sizes when formatting the LUN with VMFS. Apparently the client has some VMs that are thick provisioned in sizes over 300GB per. This is something good to know up-front when considering a new LUN allocation.

The default blocksize is 1MB which only supports up-to 256GB VMDKs. I recommend to customers they move forward with 2MB or even 4MB blocksizes. The 2MB blocksize supports 512GB VMDKs, and the 4MB supports 1TB VMDKs.

Windows Ghost Network Adapters

In some cases when dealing with virtual machines you might run into an issue with multiple network adapters. One evident issue is a conflicting IP assigned to an old adapter that no longer is visible. To resolve this issue you can follow these steps:

IP address on a network adapter

  1. Click Start, click Run, type cmd.exe, and then press ENTER.
  2. Type set devmgr_show_nonpresent_devices=1, and then press ENTER.
  3. Type Start DEVMGMT.MSC, and then press ENTER.
  4. Click View, and then click Show Hidden Devices.
  5. Expand the Network Adapters
  6. Right-click the dimmed network adapter, and then click Uninstall.