Large Image Creation Fails on Drobo

[ecamhi (Eli Camhi)]

I am using DropDMG 3.5.10 on macOS 10.15.4.

Trying to create a 50gb compressed image of a folder on my Drobo which has about 67gb worth of emails.

Each attempt fails and I receive this error message:
Error hdiutil: create failed - Operation timed out

At the end of the process I receive this response requested message from DropDMG

The disk you inserted was not readable by this computer.

Buttons: Initialize Ignore Eject

To ensure no other problems I choose ignore.

In preferences I did turn on Always run with root access but the check box does not remain checked.

I have successfully created smaller compressed images.

Any idea what’s going on?

[Michael_Tsai]

@ecamhi

Trying to create a 50gb compressed image of a folder on my Drobo which has about 67gb worth of emails.

Is the destination folder on the Drobo, too?

@ecamhi

At the end of the process I receive this response requested message from DropDMG

The disk you inserted was not readable by this computer.

This is probably from macOS, not DropDMG. Does it say the name of the disk?

@ecamhi

In preferences I did turn on Always run with root access but the check box does not remain checked.

Are you using the Mac App Store version of DropDMG?

@ecamhi

I have successfully created smaller compressed images.

Do smaller subsets from that same folder work?

[ecamhi (Eli Camhi)]

Michael

@Michael_Tsai

This is probably from macOS, not DropDMG. Does it say the name of the disk?

No name for the disk. That’s one reason why I select ignore. I am afraid it might affect my drobo disk.

@Michael_Tsai

Are you using the Mac App Store version of DropDMG?

Mac App Store Version. I am going to try the suggested terminal commands provided in the manual. Will let you know.

@Michael_Tsai

Do smaller subsets from that same folder work?

I will try and let you know.

Thanks.

[ecamhi (Eli Camhi)]

I was able to create the image with the following changes:

Executing the terminal commands regarding root access.
Changing the image destination to another drive instead of the drobo.
This worked.

I then tried once more to do the same with the image destination on the drobo.
Failed as before.

So moving the image destination to another drive is a an ok work around.
Thanks.

[Michael_Tsai]

@ecamhi

Changing the image destination to another drive instead of the drobo.
This worked.

I then tried once more to do the same with the image destination on the drobo.
Failed as before.

Thanks for the follow-up. It sounds like a Drobo issue. Maybe it’s taking too long to respond and macOS is giving up. Or perhaps there wasn’t enough free space on that volume. Are you able to create smaller disk images on the Drobo?

[ecamhi (Eli Camhi)]

Michael

Issue resolved. Using my new Mac Mini M1 running Big Sur 11.2.1 and latest version of DropDMG 3.62 I am able to create large (50gb) image files on Drobo 5C (with Dashboard 3.60) without any problem.

Thanks.

Eli