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Disk utility warnings

Drive Genius DrivePulse keeps telling my the system drive has consistency errors. When I boot into recovery and run first aid, I see these warnings:


Checking snapshot 1 of 6 (com.apple.TimeMachine.2022-02-13-113618.local)

warning: Cross Check : Mismatch between extentref entry reference count (2)

and calculated fsroot entry reference count (1) for extent (320563859 + 4)

warning: Cross Check: Count not mark range (320563859 + 4) allocated:

File exists

warning: Cross Check : Mismatch between extentref entry reference count (2)

and calculated foot entry reference count (1) for extent (418035676 + 32)

warning: Cross Check: Count not mark range (418035676 + 32) allocated:

File exists


When repair finishes it seems happy, but I've run it three times and keep getting warnings. THe final messages when first aid finishes:


The volume /dev/risk7s1 was found to be corrupt and needs to be repaired.

Verifying allocated space.

Performing deferred repairs.

The volume /dev/rdisk7s1 appears to be OK.

File system check exit code is 0.

Restoring the original state found as mounted.

Operation successful.


Since this is in a TimeMachine snapshot, do I even need to worry about it?

iMac Pro

Posted on Feb 28, 2022 1:09 PM

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Posted on Mar 2, 2022 9:24 AM

The problem appears to have resolved itself, likely as Time Machine created new snapshots and deleted old ones. I booted into recovery mode and ran disk utility, the system drive no longer has any warnings and the Time Machine snapshot with the warnings no longer exists.


My guess as to the root cause: I upgraded to Monterey recently, and for several days after had kernel panics every evening and any time I shut down the computer. It appears to be related to time machine backups — once I shut off automatic backups, all was fine. But it would not surprise me if one of the time machine snapshots got messed up at some point in there. (I’ve read that disconnecting Time Machine disks and reconnecting one at a time, and reformatting older time machine backup drives to APFS, may also solve Monterey’s Time Machine problems. For now I’m living with manual backups.)

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13 replies
Question marked as Top-ranking reply

Mar 2, 2022 9:24 AM in response to Markarian421

The problem appears to have resolved itself, likely as Time Machine created new snapshots and deleted old ones. I booted into recovery mode and ran disk utility, the system drive no longer has any warnings and the Time Machine snapshot with the warnings no longer exists.


My guess as to the root cause: I upgraded to Monterey recently, and for several days after had kernel panics every evening and any time I shut down the computer. It appears to be related to time machine backups — once I shut off automatic backups, all was fine. But it would not surprise me if one of the time machine snapshots got messed up at some point in there. (I’ve read that disconnecting Time Machine disks and reconnecting one at a time, and reformatting older time machine backup drives to APFS, may also solve Monterey’s Time Machine problems. For now I’m living with manual backups.)

Mar 1, 2022 9:44 AM in response to Markarian421

Hey there Markarian421,


It sounds like you're receiving alerts about the external disk you use for Time Machine on your Mac, and that Disk Utility reports an error after running First Aid.


If both the external disk software and First Aid are identifying an issue with the disk, there may be an issue that needs to be repaired.


Check out the details below from Repair a storage device in Disk Utility on Mac:

"If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. For information about servicing your Mac, see Find out how to service or repair your Mac."


We hope this helps.

May 3, 2022 7:24 AM in response to EBaron

So I've been down that road.

Have erased SSD reinstalled system, and data from backup. Here's what I've learned:

I have a 2018 15-inch (I'll call it "15") MacBook Pro and a 2019 16-inch (I'll call it "16")MacBook Pro. The 16 started giving these errors and I worked with Apple support, the thought there was it's not the SSD it's individual snapshots that maybe Drive Genius doesn't understand. The 15 didn't show the errors until I turned on automatic backups, then boom Drive Genius reported consistency errors.

So you can go into Disk Utility and run a repair on it (the SSD) and while it will not fix them it will tell you which snapshots are throwing the error. You can then select and remove the offending snapshots, and if you run it again all will be well.

Well, I did contact Drive Genius folks and they said Monterey was not fully supported yet, for example, you can't make a bootwell drive easily or at all.

I got tired of doing this so I just go into Drive Genius and reset the warnings and errors.

I then added a utility called Drive DX which is designed to monitor the health and function of SSD drives, and that gave me the full piece of mind I was looking for.


So I think the facts are:

  1. Both MacBooks are driving Drive Genius crazy and that leads me to believe it's Drive Genius, not the SSDs
  2. DriveDX gives you the real details of the SSD including "estimated life remaining" and with the addition of a login extension it will also work on regular HDDs too
  3. I'm thinking I will remove Drive Genius (it's not so smart)
  4. Apple's Disk utility WILL also report the errors if you bother to look but Apple support was more along the lines of deleting the offending snapshot.
  5. It doesn't seem to be an issue with other files on the SSD only the snapshots. While taking up space and not really counting towards the remaining space on the drive might be part of the issue. I think it has something to do with the special snapshot file.
  6. If you boot off the recovery partition (I did this with Apple Support) and try ti fix the drive, sometimes it will tell you the drive can't be fixed. But if you delete just the one offending snapshot and retest then there are no errors. Which all involved thought was very strange.
  7. I show exactly the same issues on 2 different SSD machines. Sounds like software or something, not SSD hardware related.
  8. Shutting off automatic backups solves the problems because snapshots for the last 24 hours are kept on the machine drive, no automatic backups no automatic snapshot creation. Manually you connect the time machine drive and start it.


Hope that helps and puts your mind a little at rest.


Steve


Mar 1, 2022 10:45 AM in response to PRP_53

Good point. I haven't used Drive Genius to try and fix the problem -- as far as I know, with APFS they don't have any tools that aren't in Disk Utility. It simply tipped me off and made me go look and see these warnings when I check with Disk Utility. Since they are only warnings, and I never would have known about them if something didn't;t make me go looking, I'm wondering if I should care.

Mar 26, 2022 1:49 PM in response to Markarian421

I have the same message now appearing in Drive Genius, When I run disk utility, I get the same warnings and eventually these warnings turn into errors that can not be fixed by disk utility in recovery mode. 2nd level apple support had me delete the offending snapshots and everything then tests ok. I did get DriveDX and the SSD tests ok. I have discovered that Disk Utility has a View Snapshots, so I just delete the offending one, and when retested all is well. I may try manual updates for a while.


I have another Macbook pro, with the same OS, but with a different external drive for time machine backups.


I'm kinda lost here...

Steve

May 3, 2022 6:40 AM in response to Markarian421

I am having the same problem with Monterey, drive genius and my 2019 MacBook Pro. I delete the time machine snapshots, run disk utility from a separate drive and it clears the problem but it always recurs in a few days. Prosoft advised me to wipe the ssd drive and reinstall Monterey followed by data


Also saw the above advice about shutting off time machine automatic back ups.


Is this an Apple bug? What happens if I ignore it



Disk utility warnings

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