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Newbie
RichardPears
Posts: 2
Registered: ‎05-05-2012
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Accepted Solution

To TRIM or not to TRIM on OSX

well, here's a question i bet a lot of you have come up with your own answers for. I would like to hear the official response from sandisk... do i use trim enabler on osx to use TRIM with your (awsome) ssd or not. 

the story goes that sandforce based controllers do not require trim and it can be detremental to their own garbage collection algorithms, so currently i am not using TRIM on my macbook pro. but since you guys are currently testing a firmware update that will work on the mac i figured its a perfect time for an official answer.

SanDisk Guru
drlucky
Posts: 2,867
Registered: ‎07-18-2007
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Re: To TRIM or not to TRIM on OSX

TRIM is suggested for best performance. Apple simply disables this for any third party SSD. I personally have configured my MAC to use TRIM and would suggest it. SanDisk most likely will not give an official statement to use TRIM on MAC because by default it is disabled by Apple. That said I use it and if you want to do a quick Google search and there are plenty of sites that explain how to enable it. 

Newbie
RichardPears
Posts: 2
Registered: ‎05-05-2012
0

Re: To TRIM or not to TRIM on OSX

Was thinking much the same myself, ive enabled trim now and i dont imagine ill notice anything to report back on.

Newbie
defecta
Posts: 1
Registered: ‎05-18-2012
0

Re: To TRIM or not to TRIM on OSX

[ Edited ]

i have been trying to find consensus on this point also. I believe its not a case of one size fits all for enabling TRIM on SSDs for OS X. OWC who have their own brand of SSDs specifically targettied for Mac users officially discourages the enabling of TRIM on OS X when using their brand of drives. This because the Sandforce controller that they use has its own garbage collection routines that negates the need for TRIM on the OS. 

 

I would like SanDisk to confirm if the controller in the Extreme supports background garbage collection. Because I am reluctant to make any unsupported mods to the OS unless I am very confident that there is clear evidence that its required. If there is BGC on these drives I wont be enabling TRIM on the OS, just as OWC recommends with their drives.

SanDisk Guru
drlucky
Posts: 2,867
Registered: ‎07-18-2007
0

Re: To TRIM or not to TRIM on OSX

yes these drives support garbage collection. 

SanDisk User
donka
Posts: 34
Registered: ‎05-17-2012
0

Re: To TRIM or not to TRIM on OSX

I have enabled Trim on my drive and all seems to be working fine. I see no reason not to enable this.

Newbie
MRFS
Posts: 3
Registered: ‎05-26-2012
0

Re: To TRIM or not to TRIM on OSX

Until Intel releases a version of RST that supports TRIM in RAID modes,

TRIM will NOT function when 2 or more SSDs are members of a RAID array

controlled by RST device drivers.  TRIM reportedly only works on SSDs

configured in JBOD mode (Just a Bunch Of Disks).

 

 

MRFS

Newbie
simonroenne
Posts: 2
Registered: ‎09-18-2012
0

Re: To TRIM or not to TRIM on OSX

I've had my doubts aswell.. I read on an OWC forum that all SandForce from SF-2*** didn't need TRIM enabled, since the controller already handled that stuff..

 

But what's your performance? 

I have the Sandisk Extreme 240 GB (just got it, works like a charm) and made a clean install of Mountain Lion.

I'm getting about 270 MB/s write (too little, hmm..?) but around 500 MB/s read

SanDisk User
donka
Posts: 34
Registered: ‎05-17-2012
0

Re: To TRIM or not to TRIM on OSX

And I'm guessing you are using something like BlackMagic to test the drives speeds? Read up on Sandforce controllers and compression. That write speed seems spot on for incompressible data such as used with a tool like BlackMagic.
Newbie
simonroenne
Posts: 2
Registered: ‎09-18-2012
0

Re: To TRIM or not to TRIM on OSX

Oh ok, yes, you're spot on. Blackmagic was what i used.

Should i try other programs or does it look like it's functioning optimally?

 

It's sure as hell faster to boot from, that's for sure.

 

My 7200 rpm stock drive (Hitachi, i think, 500GB) was just around 98 MB/sec for both read and write. (in Blackmagic)