VMware vCenter Install Select Datastore Insufficient Disk Space
In this post, I describe how to fix the error "Insufficient disk space. Minimum required: 25GB" which can occur when installing vCenter Server and selecting the datastore:
Cause
This error occurred for me when I tried to install vCenter Server on an ESXi host which I had created in VMware Workstation version 16.2.2 using the default disk size of 142GB.
Despite seeming to be enough space for a tiny test install, this actually only leaves 14GB free for the datastore due to the 120GB taken up by VMFSL (ESXi System Partition):
Resolution
There are two ways to resolve this issue. Either increase the size of the datastore or reinstall ESXi with a smaller VMFSL partition.
Resolution 1: Increase Datastore Size
To increase the datastore size, simply add another disk to the ESXi server, then increase datastore capacity through the ESX management UI (accessible through a web browser using the IP address of the ESXi host).
Resolution 2: Install ESXi with a smaller VMFSL partition
https://kb.vmware.com/s/article/81166
As per the article "Start the host with the install image and when the ESXi installer window appears, press Shift+O within 5 seconds to edit the boot options."
Then type:
systemMediaSize=min
after the existing runweasel cdromBoot command:
Complete the installation as normal.
Now, when you view the VMFSL partition, you will notice it is only 24 GB:
This leaves plenty of space for your datastore:
The vCenter Server installation can now proceed beyond the Select datastore step.
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