My 5 year-old iMac has been a rock - until yesterday. Suddenly, it became extremely sluggish with nothing but spinning wheels & beach balls. Even closing an app required 5 minutes or more. I finally managed to shut down & reboot.
The reboot seemed a normal pace, but afterwards, login was excruciatingly slow. After an approx 5 minute login process, I ran
Activity Monitor to see if perhaps the dreaded BitDefender has commandeered all resources, but there was very little resource utilization for any process shown in
This felt like a HDD problem, so I ran
First Aid w/ Disk Utility on
Macintosh HD from the
Volumes view. It concluded with a green checkmark &
Operation successful after checking 18 snapshots (?! what??).
I then switched to
Device view & ran First Aid on
Container disk4 and
Macintosh HD (again). In all 3 cases,
First Aid reported:
green checkmark &
Continuing on to the Disk Images (Apple disk image Media & macOS Base System),
First Aid again reported
green checkmark &
These results seem to indicate that all is well, no? However, an odd thing (to me) was that Disk Utility (Volumes view) reports a 2.12TB HDD (APFS) for Macintosh HD, but the
macOS Base System reports only 2.01GB w/ 1.28GB used & 733 MB free. Switching to Devices view shows a "Fusion Drive" of 2.12TB, a "Container disk4" with 2.12TB consisting of:
3 Not Mounted(11.63GB)
After all of this, it still feels like a HDD issue, but I cannot even guess what it might be. I'm puzzled by the fact that only 2GB of a 2TB drive are allocated to Macintosh HD - Why??. I've changed nothing on this machine; it's used almost exclusively by my partner who emphatically claims she's not changed anything - and I'm sure that's true.
I've looked through all of the "similar questions". I've run the "Diagnostics" (holding down the
D key), but this effort seemed useless & inspired no confidence. About 1/3 through the Diagnostic process with 2 minutes (of the initial estimated 3 minutes) remaining, the "diagnostics" declared that everything is OK :O But it's not OK! The diagnostics then led me to a reboot, claiming that I'd go to Safari which would give me "options" for further troubleshooting led to a boot, but upon reaching Safari & clicking on "A" for Apple, I get marketing BS about a new iPhone!
Given that none of the answers to the similar questions were selected as correct, I don't expect a "silver bullet" answer here. However, I do hope that someone might offer an explanation of a 2GB Macintosh HD on a 2TB Fusion Drive, and perhaps suggest another line of troubleshooting to pursue. The sudden onset of major dysfunction is baffling to me.
EDIT 1; 9/17/22
A screenshot from:
Apple menu > About This Mac, then click Storage:
EDIT 2; 9/18/22
$ diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *121.3 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_APFS Container disk2 121.1 GB disk0s2 /dev/disk1 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *2.0 TB disk1 1: EFI EFI 209.7 MB disk1s1 2: Apple_APFS Container disk2 2.0 TB disk1s2 /dev/disk2 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +2.1 TB disk2 Physical Stores disk0s2, disk1s2 1: APFS Volume Macintosh HD 155.3 GB disk2s1 2: APFS Volume Preboot 42.2 MB disk2s2 3: APFS Volume Recovery 510.6 MB disk2s3 4: APFS Volume VM 3.2 GB disk2s4
$ diskutil cs list No CoreStorage logical volume groups found
EDIT 3; 9/21/22
Since my last edit, I've installed
DriveDx to help troubleshoot the suspected issues with my Fusion Drive. Based on the results from
DriveDx, I believe the Fusion Drive is the source of my issues.
A visit to IFIXIT revealed two facts:
Apple gave no thought to maintenance of the iMac - or if they did, that thought was directed at how to impede customer-performed maintenance!
Mortals like myself should take heed, and outsource HDD replacement! Consequently, I made an appointment with the local "Apple Store" to have the problem remedied by one of their "Geniuses".
Unfortunately, my appointment with the "Genius" took 3 hours out of my life, but yielded no repair and no real solution. A nice enough fellow, but as a "genius" he came up a bit short (as I understand the meaning of this word). After 2+ hours of running tests, the "Genius" was unable to diagnose the problem, and offered only one "solution": "Buy a new iMac".
<rant>What a great company Apple is: Their "solution" to failure of a HDD in their 5 yr-old computer is to condemn the entire machine to a landfill. Meanwhile, they simultaneously make suspect claims about how environmentally friendly their products are. With "friends" like these - who needs enemies?
Up next: IFIXIT has some detailed guides for replacing the Fusion Drive. After perusing a few of them now, it's clear (but not easy) on how to remove the SSD component of Apple's ill-conceived Fusion Drive. It also seems that Apple's APFS does not (effectively) support conventional (rotating disk) HDDs - meaning that the HDD component of Apple's Fusion Drive must be replaced with a SSD. What is not yet clear is exactly how to get Apple's OS (Mojave in this case) to adapt to a single SSD. Any thoughts on this would be appreciated - a complete answer so much the better!