Adding a New Storage Datastore to ESXI 6.5 (on an HP DL380 G7), and fixing the “Failed to create VMFS datastore – Cannot change the host configuration” error

This is part 3 of 3 in a series on adding new drives and storage to my HP DL380 G7 server and ESXi. The previous 2 parts are here, part 1 – adding new drives, and part 2 – configuring a new RAID array.

After the previous two steps were complete, the new disks are in, the new RAID array configured, the next step is to add the storage in ESXi to be available to new VMs. Here’s my starting point, almost out of space:

Right now I have 1 Datastore configured in ESXi:

To add a new Datastore in ESXi:

At this point I ran into the error ‘Failed to create VMFS datastore’:

This post with steps to fix the partition table on the newly added drives. First step was to enable the sshd service to ssh into the server:

First, use this command to find the disk id of the newly added disk. Here I can see my new disk array as it’s the one closest to 1TB, the size of the new disks:

ls -lha /vmfs/devices/disks/

This command shows the issue with the partition table on the new disk array:

 partedUtil getptbl /vmfs/devices/disks/(disk ID)

Next, use this command to reset the partition table to msdos type for the new disk array:

partedUtil setptbl /vmfs/devices/disks/(disk ID) msdos

Repeating the previous steps to add the new datastore now works, new store added:

New storage space now looks good!

Checking in iLO on the newly added disks, looks good:

Also, taking a look at fan speeds after 30mins or so, fan speeds all look good!