New rMBP issue, SSD is not freeing space

[Tegeril]

So I moved a number of DVD-5 ISOs onto the drive (256GB). It had about 133GB free at the time according to the OS and I moved enough onto the drive for it to drop to about 90GB. I've since deleted all but one of those ISOs and the drive reports only 97GB free. When I tell the trash to empty one of the files, the drive spontaneously (just looking at drive info) loses the amount of space that file took up, so say I press delete when it's at 97, it drops to 92/93, then the trash finishes emptying and it jumps back up to 97.

I know not all space is immediately freed, but I'm not seeing the space recover and it's been an overnight and a reboot since the initial copy.

Any thoughts?

[edit] The plot thickens. The info from cmd+i on the drive says a specific space free (and, interestingly a full GB less than when I just posted), but in Disk Utility, the drive reports only 39GB available. This drive is not anywhere CLOSE to being that full. Verify disk says the volume is ok. I'm not sure what to do.

 

[amdhunter]

Personally, I'd install Applejack and do a full run. It runs a trim command during the process and might free up the space.

If you don't know what/how to use Applejack, I'd avoid it. http://applejack.sourceforge.net/

 

[runawayprisoner]

Do you still have anything sitting in Trash? Sometimes Trash won't allow you to empty itself if a reference link to a file still exists.

 

[amdhunter]

Do you still have anything sitting in Trash? Sometimes Trash won't allow you to empty itself if a reference link to a file still exists.

Ah, I didn't think of that either. lol, sometimes the easiest fixes are the most obvious.

 

[Tegeril]

Nope, the trash is empty, confirmed via Terminal.

 

[Tegeril]

Interestingly enough, the drive spontaneously changed and now shows the proper available space in its info window but is still quite off in Disk Utility. I wonder if there is any documentation about the disparity or how OS X trims the Samsung 830 drives.

 

[AkumaX]

Interestingly enough, the drive spontaneously changed and now shows the proper available space in its info window but is still quite off in Disk Utility. I wonder if there is any documentation about the disparity or how OS X trims the Samsung 830 drives.

i thought you had an rMBP? what does the Samsung 830 have to do with it?

 

[TheStu]

i thought you had an rMBP? what does the Samsung 830 have to do with it?

Because some of the reviews have stated that it is a Samsung 830 drive, just in a different rMBP compatible package.

 

[Tegeril]

i thought you had an rMBP? what does the Samsung 830 have to do with it?

http://www.anandtech.com/show/6023/the-nextgen-macbook-pro-with-retina-display-review/10

 

[cheez]

Not sure if I'm having a brain fart but have you tried disconnecting, or better word "unmount" the ISO image? I know this applies to Windows but should also apply on Mac. I have used it on Mac, IIRC...


:sneaky:

 

[AkumaX]

http://www.anandtech.com/show/6023/the-nextgen-macbook-pro-with-retina-display-review/10

WELL COLOR ME KNOWLEDGED

i dunno, i hate mac's memory mgmt. good thing i boot camp straight into windows

 

[wantedSpidy]

are you backing up with time machine? I had something similar happened to me and I had to turn off time machine's back up to local disk option (which is what it does if your back up HDD is not accessible)

 

[TheStu]

WELL COLOR ME KNOWLEDGED

i dunno, i hate mac's memory mgmt. good thing i boot camp straight into windows

What's wrong with OS X's memory management? Or, what specifically is the problem that you have with it?

OP, have you tried running something like DaisyDisk on the drive, see if it can locate what is eating up your space?

 

[Tegeril]

ISOs were unmounted...

wantedSpidy, talk to me about Time Machine. I have a volume but it's not always connected, what was going on for you? Does the OS retain files for a specified period of time in hopes it can back them up when a Time Machine volume becomes available in the future?

Also for those keeping score at home, I'm back to the correct amount of free space showing on the info pane for the drive but Disk Utility is still underreporting by more than half.

 

[Tegeril]

What's wrong with OS X's memory management? Or, what specifically is the problem that you have with it?

OP, have you tried running something like DaisyDisk on the drive, see if it can locate what is eating up your space?

Interesting thing about DaisyDisk, it shows me what Disk Utility shows. Scanning now, I'll update this post with the results.

Edit: Ok, here's the mystery in a nutshell --> http://cl.ly/image/3K2v3T1z3w1x I wonder what is in that "hidden space"...

 

[TheStu]

Ok, so there is going to be a GiB/GB differential at play, but not the 100GB difference you are seeing.

 

[Tegeril]

I'm running 'du' on the entire drive right now, it looks like Time Machine is a relevant culprit, but I'm still baffled at the variation of 100GB between two different Finder output space descriptions.

Results from du...

There is a 16GB swap file which is most of the 'private' storage from the Daisy Disk screenshot, 54GB is stored in /.MobileBackups which is only readable via elevated user privs. It looks exactly like a Time Machine snapshot. That probably explains the original disparity I was seeing, but I still don't understand how getting info on the internal drive says I have 168GB free when the math simply doesn't add up and is now reporting a value that is too high instead of too low.

Edit: Disabled local backups as they are not important to me and disk utility now reports what I expect for drive usage. The hilarious thing right now is that this drive has 127GB of data on it, and cmd+i on the hard drive on the desktop now shows: "Used: 30.3GB, Available 219.84GB, Capacity: 250.14GB". I kind of wish I had enough data I could delete so I could see it report a negative used value...

 

[cheez]

So did disabling the time machine (local backup) fix your space issue?

 

[wantedSpidy]

ISOs were unmounted...

wantedSpidy, talk to me about Time Machine. I have a volume but it's not always connected, what was going on for you? Does the OS retain files for a specified period of time in hopes it can back them up when a Time Machine volume becomes available in the future?

Also for those keeping score at home, I'm back to the correct amount of free space showing on the info pane for the drive but Disk Utility is still underreporting by more than half.

Lets say your time machine schedule is run once every night at 11:59pm. Then time machine starts up at 11:59, and if your back up disk is not connected then it creates a back up image on your local drive.

just run "sudo tmutil disablelocal" in terminal to disable local backups. Based on what you've said so far it definitely sounds like those sneaky time machine images.

edit: oops didn't see that you already tried it

 

[Tegeril]

So did disabling the time machine (local backup) fix your space issue?

Sorry for the delay on this, yes, the issue was indeed local backup, the Finder took a short time to reflect the updated free space in the info pane for the drive, but Disk Utility reported it properly right away. I'm a bit baffled by the performance of the feature because it lets the SSD run down to a very low quantity of free space before making more available and Anand has shown quite thoroughly that the 830 doesn't continue to perform amazingly in super-low free space scenarios.