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TRIM Support no longer 'easy' in Yosemite

crjackson2134 said:
If you decide to do this, just be sure that you use 10.9.4 or earlier. Once Macericks is booted, and Trim is enabled, you open up Disk Utility and select the disk you want to Trim, then run Disk Repair. This will run the Trim routine near the end, and all unused areas of the SSD will be Trimmed.
Click to expand...

Cool! So why 10.9.4 or earlier - is there some problem doing this with 10.9.5?
 
^^^^No, I the issue with kext never arose until Yosemite IIRC. Early on in Yosemite, like with the first developer and Beta releases.

I didn't want to disagree with Mr. Jackson again😱

Lou
 
flowrider said:
^^^^No, I the issue with kext never arose until Yosemite IIRC. Early on in Yosemite, like with the first developer and Beta releases.

I didn't want to disagree with Mr. Jackson again😱

Lou
Click to expand...

Why not? I respect your opinions. If I'm wrong, I'm wrong. It's not personal, and I appreciate the knowledge 🙂

I was running both Mavericks and Yosemite PB at the same time too. For some reason I was thinking 10.9.5 had the same new policy.
 
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I haven't yet tried this myself, but this seems to be a good measure to take. You should be able to do PRAM resets without losing Trim or getting the no boot condition.

https://forums.macrumors.com/posts/20286850/

UPDATE: Okay, so I ran the command below in terminal, left Trim Enabled, and did an NVRAM reset 4 times to test. The modification held, Trim is still working fine, Trim Enabler is working fine. This seems like a good fix.

Code: 
sudo /usr/libexec/PlistBuddy -c "Set :'Kernel Flags' 'kext-dev-mode=1'" /Library/Preferences/SystemConfiguration/com.apple.Boot.plist
 
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If you are talking about booting Yosemite into single user mode and running from there... Never tried that.

I installed Mavericks 10.9.5 on a separate physical disk, enabled Trim with Trim Enabler, then ran repair on the Yosemite disk (non-CoreStorage volume). I don't have the Mavericks disk anymore, but I can reinstall it and re-check it if you like. You could be right that it was erase free space I used, but IIRC I ran the repair.
 
mrf5 said:
Are u sure “Repair Disk” will trim unused blocks?

I know "Erase Free Space" or running fsck in single mode would ...(assuming trim is active)
.
Click to expand...

Yes ... it will trim unused blocks.

You must:
- have trim enabled for the SSD (i.e. no USB attached SSDs. Only SATA, eSATA, or Thunderbolt)
- select the named logical drive, not the top physical drive in disk utility
- can't be your boot disk, boot from a Mavericks partition with trim and repair your Yosemite disk.

Towards the end of the repair dialog, you will see "trimming unused blocks" displayed.
 
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crjackson2134 said:
If you are talking about booting Yosemite into single user mode and running from there... Never tried that.

I installed Mavericks 10.9.5 on a separate physical disk, enabled Trim with Trim Enabler, then ran repair on the Yosemite disk (non-CoreStorage volume). I don't have the Mavericks disk anymore, but I can reinstall it and re-check it if you like. You could be right that it was erase free space I used, but IIRC I ran the repair.
Click to expand...

Actually before i posted, i test it by booting from the recovery partition (w/trim enabled) & the dialog didn’t report … trim unused blocks ..
So, maybe ur right as long as no boot from recovery partition (restore boot disk utility) – I just have no way to test that (my drives almost full).


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

hfg said:
Yes ... it will trim unused blocks.

You must:
- have trim enabled for the SSD
- select the named logical drive, not the top physical drive in disk utility
- can't be your boot disk, boot from another or use restore boot disk utility

Towards the end of the repair dialog, you will see "trimming unused blocks" displayed.
Click to expand...

Thanks.

btw, did u have the chance to test it by booting from the recovery partition (restore boot disk utility) or it has to boot from a full OS partition/disc?

.
 
mrf5 said:
Actually before i posted, i test it by booting from the recovery partition (w/trim enabled) & the dialog didn’t report … trim unused blocks ..
So, maybe ur right as long as no boot from recovery partition (restore boot disk utility)
Click to expand...

Are you sure you booted "from recovery partition (w/trim enabled)"?

How did you enable Trim while booted to the recovery partition?
 
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I updated Trim when the Yosemite update was available. The day Yosemite was released I obviously upgraded (couldn't wait!) and all is working fine. From the 'about this Mac' Trim enabled is marked yes. This could mean that that the KEXT signing security is altered?
 
Another question: under what circumstances does a PRAM reset occur without doing it manually?

OS Update, perhaps?

Currently, i've simply turned TRIM off.
 
mrf5 said:
btw, did u have the chance to test it by booting from the recovery partition (restore boot disk utility) or it has to boot from a full OS partition/disc?

.
Click to expand...

Sorry, I wasn't clear in my post ...

If you are running Mavericks, you can boot from the recovery partition and use that Disk Utility to "Repair Disk" and it will trim unused blocks. Sorry ... this won't work.

If you are running Yosemite, you need a small bootable partition with Mavericks and trim enabled which you can then use to "Repair Disk" on your Yosemite SSD and it will then trim unused blocks.
 
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hfg said:
Sorry, I wasn't clear in my post ...

If you are running Mavericks, you can boot from the recovery partition and use that Disk Utility to "Repair Disk" and it will trim unused blocks.

If you are running Yosemite, you need a small bootable partition with Mavericks and trim enabled which you can then use to "Repair Disk" on your Yosemite SSD and it will then trim unused blocks.
Click to expand...

Thanks for the tip, I'd assumed blindly that cmd+r you would be able to trim the drive. I will leave a 10.9 bit when its 10.10.1 upgrade time on a sled SSD.
 
crjackson2134 said:
Are you sure you booted "from recovery partition (w/trim enabled)"?

How did you enable Trim while booted to the recovery partition?
Click to expand...
Yes. I had “TrimEnabler active.
btw, I haven’t switch to Yosemite yet (still on Mavericks)

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


hfg said:
Sorry, I wasn't clear in my post ...

If you are running Mavericks, you can boot from the recovery partition and use that Disk Utility to "Repair Disk" and it will trim unused blocks. ...
Click to expand...
You were clear, btw. I’m the one who didn’t post enough info ..🙂

I test it with Mavericks (w/trim enabled) but the repair dialog didn’t report … trim unused blocks ..

did u actually test it using the recovery partition? Or u used another Mavericks/Ml partition? (assuming u used Mavericks)

I ‘ve been using fsck for years (w/trim enabled) & that works fine. i also used "Erase Free Space" in the past, it works but its not practical & time consuming. So when "crjackson2134" posted “Repair Disk” as another trim option I was hoping the recovery partition would do it (maybe it does & the issue in my end).

Q, does Yosemite install recovery partition? (same as Mavericks)

.
 
mrf5 said:
Yes. I had “TrimEnabler active.
btw, I haven’t switch to Yosemite yet (still on Mavericks)

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



You were clear, btw. I’m the one who didn’t post enough info ..🙂

I test it with Mavericks (w/trim enabled) but the repair dialog didn’t report … trim unused blocks ..

did u actually test it using the recovery partition? Or u used another Mavericks/Ml partition? (assuming u used Mavericks)

I ‘ve been using fsck for years (w/trim enabled) & that works fine. i also used "Erase Free Space" in the past, it works but its not practical & time consuming. So when "crjackson2134" posted “Repair Disk” as another trim option I was hoping the recovery partition would do it (maybe it does & the issue in my end).

Q, does Yosemite install recovery partition? (same as Mavericks)

.
Click to expand...

I generally use a different bootable disk as I have several in my cMP. Be sure you select the "named logical disk" in Disk Utility ... this will be the bottom icon for that drive. If you select the top icon, the physical disk, you will not see the trim message. Also, be sure "trim" is enabled before you start, and that the target drive is not an external USB SSD as USB doesn't do trim.
 
hfg said:
I generally use a different bootable disk as I have several in my cMP. Be sure you select the "named logical disk" in Disk Utility ... this will be the bottom icon for that drive. If you select the top icon, the physical disk, you will not see the trim message. Also, be sure "trim" is enabled before you start, and that the target drive is not an external USB SSD as USB doesn't do trim.
Click to expand...

Tried it again, no go.
-------------------

Gav Mack said:
Thanks for the tip, I'd assumed blindly that cmd+r you would be able to trim the drive. I will leave a 10.9 bit when its 10.10.1 upgrade time on a sled SSD.
Click to expand...
@Gav Mack
(if u still on Mavericks & got a chance) could u give it a try - boot from the recovery partition - Repair Disk & see if the repair dialog reports “trim unused blocks”?
thx
 
mrf5 said:
Tried it again, no go.
-------------------


@Gav Mack
(if u still on Mavericks & got a chance) could u give it a try - boot from the recovery partition - Repair Disk & see if the repair dialog reports “trim unused blocks”?
thx
Click to expand...

Will have to be manana - all my Macs are fast asleep where I will be shortly!
 
mrf5 said:
Yes. I had “TrimEnabler active.
btw, I haven’t switch to Yosemite yet (still on Mavericks)
Click to expand...

It sounds like you were booted to the OS and enabled trim, then booted to the recovery partition and tried to run the disk repair (believing that Trim would be enabled there too).

Activating Trim from the normal OS, does not enable Trim for the restore boot partition. That's why I wanted to know how you enabled Trim for a restore boot partition. It can be done I assume, but I don't personally know how.

I booted into full install of Mavericks (on a different physical disk), enabled Trim, then ran the repair.
 
A ton of posts that would unnecessary if Apple simply used the industry standard APIs to ask the drive if it supported TRIM (like the other x64 operating systems do).
 
crjackson2134 said:
It sounds like you were booted to the OS and enabled trim, then booted to the recovery partition and tried to run the disk repair (believing that Trim would be enabled there too).

Activating Trim from the normal OS, does not enable Trim for the restore boot partition. That's why I wanted to know how you enabled Trim for a restore boot partition. It can be done I assume, but I don't personally know how.

I booted into full install of Mavericks (on a different physical disk), enabled Trim, then ran the repair.
Click to expand...


Regarding trimming a disk from the recovery partition:

Hmmm ... I believe you are correct here and I was mistaken above (it has been a long time since I booted a recovery partition). I have several bootable system disks in my Mac and it is easier just to reboot to one of them with trim enabled and then repair disk the other drive to trim unused blocks. Thanks for correcting this!

I will correct my post above ... sorry for misleading anyone here.
 
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