Oh crud.

/dev/disk3s3    3.4T  3.4T  492M 100% /Volumes/rawTimeMachine
/dev/disk4s2    3.3T  3.3T     0 100% /Volumes/TimeMachine

So this morning, I saw something in the console log that made me worried. 
Another one of those "cannot cat this inode" issues.

A verification of the Time Machine image showed that it was fine. So now let's 
verify the underlying physical drive.

Oh, it's live. Unmount the Time Machine volume.

Nope, still live.

A quick check showed that the diskimage-helper program was still running. 
Right, I have to actually eject the Time Machine volume.

The raw volume is fine. Remount Time Machine, and oops.

Remember, yesterday I shrank the diskimage with disk utility, and at that point 
the reported size was working correctly. It was ignoring the space on the 
underlying physical drive, and reporting that it had about 2 TB of unused space 
inside the diskimage. The only thing I did since then it was a complete flush 
of the cache.

The underlying physical drive still has space. The Time Machine volume is 
ignoring that, and only using its own space. This is good.

But in the process of completely cleaning out the cache, and reading the data 
off the drive, it went from seeing a large amount of space to seeing no space.

There seems to be a cache consistency problem in the diskimage system somewhere.

I'm probably going to reformat this thing, and start over. Having lost the two 
month history, there is no reason not to.

EDI: Or, you know, ...

keybounceMBP:TimeMachine michael$ du -s lost+found/
du: cannot read directory 'lost+found/dir_11663332': Permission denied
du: cannot read directory 'lost+found/dir_13655795': Permission denied
du: cannot read directory 'lost+found/dir_14096703/com.apple.documentVersions': 
Permission denied
... 456 total lines ...
du: cannot read directory 'lost+found/dir_4871298/Pictures': Permission denied
du: cannot read directory 'lost+found/dir_4871298/Public/Drop Box': Permission 
denied
du: cannot read directory 'lost+found/dir_8696987': Permission denied
915271136       lost+found/
keybounceMBP:TimeMachine michael$ 

Yea ...

---
Entertaining minecraft videos
http://YouTube.com/keybounce

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