NetBox changes: Unit size for VirtualMachine.disk and VirtualDisk.size changed from 1 gigabyte to 1 megabyte.

[lucafabbri365]

Hello,
based on the recent changes in version 4.1.0 of NetBox regarding the unit size for VirtualMachine.disk and VirtualDisk.size (from 1 gigabyte to 1 megabyte), NetBox-sync reports an incorrect value in the virtual disk size of virtual machines.

[bb-Ricardo]

Thank you. for this hint, will add a fix.

[bb-Ricardo]

Hey,

I just pushed another commit to development branch to fix this issue with NetBox 4.1.0. Would you be able to try it out?

Thank you

[cguadall]

Hello,

I've tried the last commit to development and it works correctly. Thank you.

Reviewing the commit a doubt have raised. According to this netbox discussion, it seems that the preferred option to convert units is using SI (divide by 1000)

netbox-community/netbox#17484

The information provided by vmware uses the SI units (decimal) or are binary based?

[lucafabbri365]

Hello @bb-Ricardo,
as written by @cguadall NetBox uses Base 10 (MB or GB) in place of Base 2 (MiB or GiB).

While adding a new virtual disk, the size is entered in MB, but it is then displayed in GB (by dividing by 1000).
Before you answered to this issue, I applied a workaround the code inside /module/sources/vmware/connection.py

FROM:

disk_size = grab(vm_device, "capacityInKB", fallback=0)
disk_size_in_gb = int(disk_size / 1024 / 1024)
if disk_size_in_gb < 1:
	vm_device_description.append(f"Size: {int(disk_size / 1024)} MB")
	disk_size_in_gb = 1

disk_data.append({
	"name": grab(vm_device, "deviceInfo.label"),
	"size": disk_size_in_gb,
	"description": " / ".join(vm_device_description)
})

TO:

disk_size = grab(vm_device, "capacityInKB", fallback=0)
disk_size_in_mb = int(disk_size / 1024 / 1024 * 1000)
disk_data.append({
	"name": grab(vm_device, "deviceInfo.label"),
	"size": disk_size_in_mb,
	"description": " / ".join(vm_device_description)
})

Merging the above with your modified version in development, it could be:

disk_size_in_kb = grab(vm_device, "capacityInKB", fallback=0)
if version.parse(self.inventory.netbox_api_version) < version.parse("4.1.0"):
	disk_size = int(disk_size_in_kb / 1024 / 1024)
	if disk_size < 1:
		vm_device_description.append(f"Size: {int(disk_size_in_kb / 1024)} MB")
		disk_size = 1
# since NetBox 4.1.0 disk size is represented in MB
else:
	disk_size = int(disk_size_in_kb / 1024 / 1024 * 1000)

(Maybe there is a more elegant way to do that).

[bb-Ricardo]

Hi,

I noticed this as well the next day. Just reading this: https://en.wikipedia.org/wiki/Byte#Multiple-byte_units makes you realise what happens if you led toner heads run your company. What a mess.

Will try to fix it the next few days.

[bb-Ricardo]

The issue #400 is pretty much the same problem in a different location.

Because the values of the API have not changed (at least with the issue #400). So I will combine these two and with the config option the decission is up to the user. What do you think?

VMWare reports base 2 based values.