Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
El Capitan and TRIM Support
- Thread starter CheMillan
- Start date
- Sort by reaction score
That seems reasonable, but does a pre-release version of the man page for fsck_hfs mention TRIM?
(I posted, long ago, about some TRIM-related code in open source, but right now I can't recall where that was.)
I have not reviewed the 10.11 documentation, but this has worked I know as far back as Lion, so I assume the functionality will remain in place.
I couldn't get it to work for me. The command would run just fine, it just no longer reported "Trimmng unused blocks".
Maybe I did it wrong, I'm not sure.
Maybe I did it wrong, I'm not sure.
I just ran the command in single user mode with Trim on, and it worked for me. Give it another shot.
Trim is enabled by turing off SIP and running the trimforce enable command. System profiler reports that it's working.
I then boot into Cappy's single user mode with CMD+S and get a tty screen.
I run the command fsck -fy and it goes through all the normal motions, but never reports "Trimming Unused Blocks"
Does that also work on external (non-boot) SSD drives..?
I have an internal Apple branded SSD as boot volume (native TRIM supported) and an external SSD (Thunderbolt, 2 SSD's in RAID0).
I executed the rootless and enabled TRIM.
The system profiler shows TRIM enabled on the External SSD.
But can fsck -fy in Single User mode "trim unused blocks" of external volumes?
Running fsck_hfs -l /dev/disk3 in Terminal.app normally doesn't do it...
I don't know. Does the fsck command run at all with that command and it just does not TRIM unused blocks, or will the command not execute?
It was easier than I thought...
It is:
fsck_hfs -fy /dev/disk# (# of your disk, no -l option)
See pic:
Indeed. Expect fsck_hfs to not perform trimming whilst the file system is mounted; not whilst the file system is locked.
OK, 10.7. 'Trimming unused blocks' appears in http://www.opensource.apple.com/source/diskdev_cmds/diskdev_cmds-540.1/fsck_hfs.tproj/fsck_msgnums.h for Mac OS X 10.7 but not in http://www.opensource.apple.com/source/diskdev_cmds/diskdev_cmds-491/fsck_hfs.tproj/fsck_msgnums.h
Found, with reference to code that was used for OS X 10.8.1: Does OS X sometimes run a TRIM routine with drives that are not explicitly supported?
How it it unofficial? The utilities are provided by Apple and as of DP2 do not require rootless to be disabled. How is it a kludge? These utilities recognise people were messing with kexts (which is a kludge) and provides an official way to avoid that.
Never supported and never will?? Good job....
I haven't had a chance to work with DB2 yet. Is the procedure the same only removing the rootless requirement?
i.e. just running the trimforce enable command and rebooting?
So, it's becoming even better!!
I assume that the Next step will be a button in Disk Utility!
If I have a custom Fusion drive enabled (1TB Apple spinner, 240GB SSD), should i run the
fsck_hfs -fy /dev/disk# on the “virtual” Fusion drive or the “regular” SSD drive as seen in the diskutil list?
fsck_hfs -fy /dev/disk# on the “virtual” Fusion drive or the “regular” SSD drive as seen in the diskutil list?
Ok, all the techno terms are confusing the bejeezus out of me.
Does it look like El Cappy will get a simple feature/button/whatever that will help you switch on TRIM without jumping through hoops and disabling core security features?
Does it look like El Cappy will get a simple feature/button/whatever that will help you switch on TRIM without jumping through hoops and disabling core security features?
As it stands right now with the latest developer preview version, all you have to do is open Terminal and enter the line below then provide your password when prompted, and you are done.
No security features or anything else need to be bypassed or disabled.
Code:
sudo trimforce enable
Sounds like a great opportunity for someone to build a simple App that says "TRIM: Enable". They could make a fortune.
^^^^Somebody (Cindori) already did. Go back to page four:
https://forums.macrumors.com/threads/el-capitan-and-trim-support.1890467/page-4
and read Post No. #83.
The name of the app is even close to your suggested name.
Lou
https://forums.macrumors.com/threads/el-capitan-and-trim-support.1890467/page-4
and read Post No. #83.
The name of the app is even close to your suggested name.
Lou
I have a similar setup, but actually use the external ssd as a boot drive with 10.11. Using single user mode and running simply fsck -fy does, in fact work on the external drive and does show the "Trimming unused blocks" phrase. When booted from the external SSD the default volume for the fsck -fy command is the boot device, not necessarily the internal SSD.
This is with trim force on, SIP on, Disksensei off. The modified kext is not needed at all in this setup, which is truly neat and sweet
. Disksensei has an interesting Trim page, where it says "Trim has not been enabled, but is working anyway."