KB ID 0001565

Problem

There’s always one! I had a single ESX host that refused to add a datastore?

Failed to create VFMS Datastore {Name} – Cannot change the host configuration.

Solution

I already half suspected what the problem was, because I’d had a similar problem earlier on this week presenting disks to a Windows VM, there’s a GPT partition table on the dive/array.

But without waiting an hour for the HP RAID software to security erase the drives, (and a reboot,) how would I do the same with ESX?

First take note of the drive device name.

Connect with an SSH client, and list the device names with the following commands;

cd /dev/disks
ls

Copy the device name to the clipboard, and execute the following command;

partedUtil mklabel /dev/disks/{device-id} msdos

Then try to add the datastore again.

Steve Dean
11/01/2020

Same Error can occur when Jumbo Frames are not enable on ISCSI related physical switches. Had a client reuse some Nimble storage on new cluster and attached the ISCSI connections to a new switch. MTU was set to 9000 on the array and on the vSwitch but not on the physical switch. Adjusting MTU size on the array and vSwitch corrected the issue.
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- Vince M
  14/08/2020
  
  Steve, your solution was what resolved my issue. thanks!
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Virgil Bester
13/07/2020

Hi, the solution posted above worked for my, life saver, thanks
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Reza Ordoubadi
01/09/2020

Hi, Thank you. It solved my issue too.
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