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Are there really any downsides to a DIY Fusion drive? According to Apples presentation, you get a ~15% speed hit, but if that is overall, I don't see a problem with it.
Not with the DIY part but the Fusion drive implementation seems to break most of the Windows bootcamp compatibility.
 
Does this only apply to MBP's? I have a late 09 imac and was only getting 1.5gb/s negotiated link speed when I know I can get 3.

No, not just MBPs.. Lots of Macs from 2009 have this issue. You can check your Serial-ATA controller with the System Report application. Check the image I've attached; if your machine has the same controller, then yes, we have the same issue.
 

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Does this only apply to MBP's? I have a late 09 imac and was only getting 1.5gb/s negotiated link speed when I know I can get 3.

Also, the steps I'd outlined worked for a few days, but I restarted and it dropped back to 1.5, and hasn't gone back up since. I've given up; it's still much faster than my HDD, so I don't really care.
 
So are you saying that without access to a 2012 iMac or mini, I can't create a Fusion Drive using diskutil via the terminal in 10.8.2?

Correct. It won't be a true working "fusion" drive. Just a virtual drive. Apparently, when you hit the max on the SSD drive it does not function correctly and speeds drop. You need to steal the disk ultil from a 2012 mac mini and then use the command lines. That may change with the 10.8.3 firmware.
 
Correct. It won't be a true working "fusion" drive. Just a virtual drive. Apparently, when you hit the max on the SSD drive it does not function correctly and speeds drop. You need to steal the disk ultil from a 2012 mac mini and then use the command lines. That may change with the 10.8.3 firmware.

I would take this with a grain of salt. Not saying you're wrong, but it doesn't' make sense that Apple would create TWO versions of diskutil, and somehow only install that on a new 2012 mac..

Besides, the DIY Fusion drive was pretty thoroughly tested by Ars, and they didn't report this.

Again, I'm not trying to be combative, but it strikes me that the Apple tech at work may have given you a garbled explanation of what he was doing. IT at large companies think most users don't know anything, and say any old thing to fob them off.. I've had this happen :)
 
I would take this with a grain of salt. Not saying you're wrong, but it doesn't' make sense that Apple would create TWO versions of diskutil, and somehow only install that on a new 2012 mac..

Besides, the DIY Fusion drive was pretty thoroughly tested by Ars, and they didn't report this.

Again, I'm not trying to be combative, but it strikes me that the Apple tech at work may have given you a garbled explanation of what he was doing. IT at large companies think most users don't know anything, and say any old thing to fob them off.. I've had this happen :)

Well the 2012 mini does ship with an updated version of the Disk Utility app, so I think its safe to assume is also has newer a newer diskutil and that these versions contain updates specific to Fusion Drive.

I set up my Fusion Drive last night, and migrated my account over from a backup overnight. My SSD certainly filled up, and the data overflowed to the HDD. After that though, the computer was quite slow and prone to beach balling and freezing. I couldn't find evidence of data shuffling via iostat, even after it has been sitting idle for a few hours.

I wonder how might I get my hands on the new version of diskutil, and if that would even help?
 
Well the 2012 mini does ship with an updated version of the Disk Utility app, so I think its safe to assume is also has newer a newer diskutil and that these versions contain updates specific to Fusion Drive.

snip

I wonder how might I get my hands on the new version of diskutil, and if that would even help?

You're right! I forgot about that.. so now we need someone with a new Mac to post the file for us, and maybe do some sort of a diff to see what's what.

Any volunteers to post the file? (That is legal right?)
 
I don't see how it would be a problem...

I went to the Apple Store today to try to copy the files off a new mini. Unfortunately someone decided the one mini on display was his personal research station, so I didn't get to the machine at all....

I'll post a thread in the mini forum, maybe someone will oblige us.
 
I don't see how it would be a problem...

I went to the Apple Store today to try to copy the files off a new mini. Unfortunately someone decided the one mini on display was his personal research station, so I didn't get to the machine at all....

I'll post a thread in the mini forum, maybe someone will oblige us.

I would imagine it'll also work with the file from a new iMac as those are FUD configurable as well.
 
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