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APFS and Fusion Drives

I suspect they were not finished, just updated to beta 2 and now my diskutil output has changed. It is listing a main and secondary physical store.

APFS Container (1 found)

|

+-- Container disk2 1E034718-E726-40C1-8173-C22F58EDB47D

====================================================

APFS Container Reference: disk2 (Fusion)

Capacity Ceiling (Size): 3255449649152 B (3.3 TB)

Capacity In Use By Volumes: 1801053626368 B (1.8 TB) (55.3% used)

Capacity Available: 1454396022784 B (1.5 TB) (44.7% free)

|

+-< Physical Store disk0s2 187ADBD1-8840-40FB-A016-08A0AF9AA18F

| -----------------------------------------------------------

| APFS Physical Store Disk: disk0s2 (Main)

| Size: 255716540416 B (255.7 GB)

|

+-< Physical Store disk1s2 7C6FE268-F6C3-42C3-8DDB-B59445AF173A

| -----------------------------------------------------------

| APFS Physical Store Disk: disk1s2 (Secondary)

| Size: 2999733108736 B (3.0 TB)

|

+-> Volume disk2s1 1EA7D8AA-6B8B-3BD1-A79A-EEFD1B936DEC

| ---------------------------------------------------

| APFS Volume Disk (Role): disk2s1 (No specific role)

| Name: Macintosh HD (Case-insensitive)

| Mount Point: /

| Capacity Consumed: 1791492239360 B (1.8 TB)

| Capacity Reserve: None

| Capacity Quota: None

| Encrypted: No

|

+-> Volume disk2s2 93BA10D0-162F-43B0-BDD9-330D9F37C61B

| ---------------------------------------------------

| APFS Volume Disk (Role): disk2s2 (Preboot)

| Name: Preboot (Case-insensitive)

| Mount Point: Not Mounted

| Capacity Consumed: 18694144 B (18.7 MB)

| Capacity Reserve: None

| Capacity Quota: None

| Encrypted: No

|

+-> Volume disk2s3 2B0C4FF8-2420-475B-8335-61771154534A

| ---------------------------------------------------

| APFS Volume Disk (Role): disk2s3 (Recovery)

| Name: Recovery (Case-insensitive)

| Mount Point: Not Mounted

| Capacity Consumed: 505393152 B (505.4 MB)

| Capacity Reserve: None

| Capacity Quota: None

| Encrypted: No

|

+-> Volume disk2s4 FBDD57D6-A546-47D3-9C0C-8E87A0E9CE99

---------------------------------------------------

APFS Volume Disk (Role): disk2s4 (VM)

Name: VM (Case-insensitive)

Mount Point: /private/var/vm

Capacity Consumed: 20480 B (20.5 KB)

Capacity Reserve: None

Capacity Quota: None

Encrypted: No
 
Installing it now on new iMac with 3tb fusion drive. Failed miserably first time. Did not move to new file system with second beta. When I did first time it destroy so many things. Had to put iMac in recovery mode multiple times and use terminal to repair fusion drive and reinstall Sierra.
 
grahamperrin said:
Cool.

Is performance better, or unchanged?

Hint: in MacRumors Forums, use the ⊞ menu to paste as code. For things such as Terminal output, the result is much more legible.
Click to expand...
Performance seems the same, write speeds are lower than my SSD’s capability but faster than the HD’s ability. Around 250MB/s.

I had no idea human readable standard English syntax terminal output was “code.” I guess I wasted all those years in Computer Science classes. Thanks for the tip.
 
i didn't wanted to open a new thread, I had some problems with apfs and my 1.12 Tb fusion drive with the first beta. Beta 2 seems to me quite ok on a late 2013 imac, my question would be, did somebody try to convert the hfs+ to apfs? the option is greyed out in disk utility, but it is active in recovery mode.
 
From what benchmarks I've seen, APFS is mostly slower on Fusion drives than HFS+. I'll probably won't convert as performance already kinda sucks with FD.
 
DO NOT try this. It will break your Fusion Drive. It will be terribly slow and it will give you some random hangs and kernel panics. Once you boot again, it will stay in a bootloop. You can NOT repair the Fusion Drive under CMD + R. You can't even format it again. The only thing you can do, is using Internet Recovery. In my case it meant: downloading Yosemite, installing Sierra and then use a Time Machine-backup.

Just don't try this, until Apple says it is possible.
 
mszilard said:
Is it a fusion drive? How is system performance?
Click to expand...
yes it is a fusion drive. funny but running Sierra it showed both as individual drives and a single drive but under high Sierra it only shows as a single drive. Even if the repair center had not made it a fusion drive I would have using the terminal commands. I hope this answers your question. As for performance it screams.
 
DennisdeWit said:
DO NOT try this. It will break your Fusion Drive. It will be terribly slow and it will give you some random hangs and kernel panics. Once you boot again, it will stay in a bootloop. You can NOT repair the Fusion Drive under CMD + R. You can't even format it again. The only thing you can do, is using Internet Recovery. In my case it meant: downloading Yosemite, installing Sierra and then use a Time Machine-backup.

Just don't try this, until Apple says it is possible.
Click to expand...

I know, it happened to me, too. That's why i'm cautious the second time:)
 
DennisdeWit said:
So... beta 2. Does it work on Fusion Drive now, or does it still break stuff?
Click to expand...
I'm not installing APFS until the final version comes out. I still see people encounter various issues and noticeable slowdown with fusion drives. It's not worth it, and the High Sierra Beta runs just fine without it.
 
To confirm - beta runs great on my Touchbar MBP; but it's a total dog on my 2016 iMac with 2TB fusion drive - hangs, crashes, pauses, you name it. I'm persevering til the next beta but if it's no better, I may go back to Sierra.

UPDATE have had enough - reformatted drive and gone back to a clean install of Sierra. Night and day difference vs. my MacBook, which is plenty stable enough to use as a daily driver - my iMac was not happy at all and became basically unusable.

Nice to be back on something stable! Will hold off on this one until the gold master stage I think.
 
Last edited:
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cpenner said:
Much more stable in beta 3. I’ve got a 3TB Fusion Drive formatted with APFS, and with beta 3, it finally runs smoothly and can restart without crashing.
Click to expand...

Is the speed a lot better? I was barely able to use my Mac on Beta 1 and 2 with a Fusion Drive (had to downgrade).
 
JVNPhoto said:
Is the speed a lot better? I was barely able to use my Mac on Beta 1 and 2 with a Fusion Drive (had to downgrade).
Click to expand...
You may have something else going on as well. I have not experienced any degradation in service for any release with my Fusion setup. Current beta is no faster for me but generally speaking it was never slow.
 
JVNPhoto said:
Thanks for letting me know. Updated to beta 3 and the speed difference is remarkable!
Click to expand...
No worries. I figured you would be as excited about the performance boost as I was. I could barely use it on betas 1 and 2.
 
I just updated the current PB of High Sierra (17A352a) on a late 2015 5k iMac with 3TB Fusion Drive. I didn't get (or at least I didn't notice) an option to format to APFS.
 
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