diskimagesiod hammering CPU

I have the same problem on a Mac Book Air M1.

Timemachine is on Synology.

I tried deleting the backup and creating a new one. It didn't help

Hi there.

I have the same issue since upgrade to 15.0. Still persists in 15.0.1. I am on a 16" MBP M1 Pro, and its maxing out all 10 cores to 100%!!

It has to do with timemachine backup. If I stop the TM backup, "diskimagesiod" disappears.

Not sure if its relevant, but I am using a sparsebundle image in the TM backup HDD.

Any help would be appreciated!

Hey all, I'm on a Macbook Pro M1 Pro, and I've had this issue since Sequoia 15.0 (Currently on 15.1.1) most times when Time Machine has been backing up over wifi to my USB-connected NAS through my ASUS router.

Tonight while this was happening I opened Force Quit and chose to relaunch Finder (no reasoning behind this choice, I was just frustrated). Immediately the CPU usage dropped down to normal/expected levels.

I have no clue if this will help others, or if this is mere coincidence, but thought it was worth a post.

In Disk Utility>View, select Show all Devices, highlight the top left entry.

Run Disk First Aid on all items in the left panel, from top down.

Are you running any VPN, Anti-Virus, or Cleaning apps?

Eject your TM drive for a test.

Thanks.

I tried all of this as soon as the problem occurred. Without success. It is interesting that the error does not appear when using a usb hdd, but only when using a NAS. It doesn't matter if via Wifi or LAN. This was not a problem in previous versions of MacOS.

I do not use any antivirus or cleaning software.

Well, looks like you got 27 'Me too's as of this writing. I'll add my data points fwiw. MacBook Air M2, Timemachine connected to a RaspberryPi NAS. CPU jumps to 900% thereabouts. Lasts about a minute for me when staring at Activity Monitor. Sequoia 15.1 . Perhaps next time i'll see if i can't drill down and get a thread count. Maybe its something crazy high? Anyway.... just another data point.

Is this how you did it?

Time Machine > how to back up to a sparse… - Apple Community

Try disabling the Firewall.

Disabling the Firewall seems to help reduce the length of the CPU load to 100%

Good to hear my friend.:)

I have firewall disabled since 15.0 (it was broken, kept disconnecting ssh connections) - but diskimagesiod still maxes out my CPU and makes machine very unresponsive during TM backups.

So far no advice has helped. Not even the latest MacOS update.

The time machine is unusable in this state. I was forced to turn it off and am looking for a replacement.

👍