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[ARS] Achieving fusion—with a service training doc, Ars tears open Apple's Fusion Drive

post #1 of 3
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http://arstechnica.com/apple/2012/11/achieving-fusion-with-a-service-training-doc-ars-tears-open-apples-fusion-drive/
Quote:
Apple's new Fusion Drive technology is a bit of a mystery. Dismissed by some as just another simple cache mechanism, it's drawn a lot of attention in the weeks since it was announced. (And it wasn't until the end of last week that Macs equipped with Fusion Drives actually began shipping.) Ars had its hands on a Fusion Drive-equipped Mac Mini for a few days now, and we set ourselves to the challenge of solving the mystery. We spent several days elbows-deep in the technology, attempting to determine how Fusion Drive (henceforth referred to as FD) works and what effect it has on overall system performance. We also wanted to see what happens with installing Windows through Boot Camp, and what happens when Fusion Drive fails. We've learned a lot in a short time through observation and deduction, and while some questions are still unanswered, we've gotten a lot of outstanding, exclusive info.

Basically, it attempts to push all read and writes through the SSD at a block level so it behaves more like a write-back cache. This is more aggressive use of SSD that other hybrid storage implementations that write to the HDD but then copes (caches) often used files back to the SSD.
Edited by DuckieHo - 11/8/12 at 12:17pm
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post #2 of 3
Good article with tons of information. This should put a number of rumors to rest.

It's too bad that the disk manager couldn't repair the volume without erasing everything though. Maybe that will be fixed in a future update.
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post #3 of 3
interesting article, im suprised there is only one comment (without mine)
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