time machine – hdiutil: create failed – Operation timed out

I’m attempting to create a Backup.dmg disk picture in a folder on an SMB file system.

1. Utilizing Disk Utility
2. Utilizing hdiutil
   • hdiutil create -size 4t -fs APFS -volname backup Backup.dmg

Each operations begin, however after a couple of minutes, they all the time fail with

create failed - Operation timed out

It fails the identical method when attempting to create a picture on a USB-attached disk drive.

I recall doing this over a 12 months in the past on the identical Home windows field and sharing SMB folders with no issues.

Chat GPT has many choices however nothing helpful. Google search reveals different individuals with the identical drawback however not many good options.

Does anybody have any perception into what’s going on right here?

Getting some extra perception right here from Carbon Copy Cloner…

Some SMB volumes cannot help macOS sparse disk photos

We’ve got obtained a number of reviews that macOS is unable to create disk photos on SMB volumes hosted by varied NAS gadgets. If you happen to try to create the disk picture in Disk Utility (for instance), Disk Utility reviews an “RPC Error”. After months of investigation, we now have concluded that macOS Catalina has extra stringent necessities for sparse disk photos than earlier OSes.

Answer: A number of customers have reported that adjusting the SMB configuration on the NAS to help Time Machine can resolve the issue. Time Machine additionally makes use of sparse disk photos on NAS volumes, so its necessities for the NAS file sharing service can be the identical as these required for generic sparse disk picture help.

Workaround A: A number of customers are reporting that connecting to the community quantity by way of AFP somewhat than SMB resolved the issue:

1. Eject the NAS quantity if it is at the moment mounted
2. Select “Connect with Server” from the Finder’s Go menu
3. Kind in “afp://{server tackle}” to connect with the NAS quantity by way of AFP
4. Select “New disk picture…” from CCC’s Vacation spot selector and specify a brand new disk picture on the AFP-mounted NAS quantity

Workaround B: If connecting to your NAS quantity by way of AFP is just not an possibility, then you may again up person information (e.g. your private home folder) on to the NAS quantity (i.e. do not use a disk picture). We additionally suggest disabling help for prolonged attributes (by way of the Superior Settings).

I nonetheless haven’t solved the problem… nonetheless researching…