When setting or changing IOPS values on a disk in VCD 10.5.1.1:
The IOPS Reservation value is set to "0" (unlimited) when creating a disk or changing the policy of a disk, the following error occurs:
Error: Requested disk iops 0 for virtual machine "XXX" exceeds maximum allowed iops 0.
VMware Cloud Director 10.5.1.1
This is a known issue affecting VCD 10.5.1.1 when using IOPS reservation values.
There is no resolution as the issue will be resolved in a future version.
In the interim, the following workaround is recommended:
1. Click edit disks
2. Change the disk policy to the new policy
3. Add any extra value to the disk size
4. Remove the value added to the disk size
5. Click save