Fusion Drive - Did Apple just do us a favour?

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Re: Fusion Drive - Did Apple just do us a favour?

Post by jollyjinx » Thu Nov 01, 2012 10:20 am

Actually there might be a point in using Fusion, as ZEVO currently clears out the SSD cache disk every time I'm booting. I would find it much better it ZEVO would not do that.
Using FUD with current ZFS will not work however as a single scrub will probably get FUD confused on where to store things ;-)

I did the testing just for finding more out on how FUD works , not to really use it with HFS+ or ZFS.
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Re: Fusion Drive - Did Apple just do us a favour?

Post by grahamperrin » Thu Nov 01, 2012 1:50 pm

jollyjinx wrote:… scrub will probably get FUD confused on where to store things ;-) … 


Good thinking!

A minor point … please, can we avoid the FUD acronym? Every time I see it I think fear, uncertainty and doubt. (Maybe a British thing. But I can't shake the thought.) So soon after Apple's announcement … I'm not sure how best to phrase the Fusion Drive-like behaviours that may be seen without Apple's implementation of Fusion Drive. Whilst Fusion Drive is not listed by Apple as a trademark, I hesitate before using that phrase.

For what it's worth, at the moment I tentatively bundle Apple's fusion work under an umbrella of "Mountain Lion CoreStorage with …" and to finish that sentence, I'll hop back to Patrick's topic.
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Re: Fusion Drive - Did Apple just do us a favour?

Post by jollyjinx » Thu Nov 01, 2012 2:31 pm

@grahamperrin I actually chose FUD exactly for that acronym. Have a look on how unsafe HFS+ is: http://www.jinx.de/zfs/hfsfailure.html and using two drives for one HFS+ volume just creates more and more risk of loosing data.
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Re: Fusion Drive - Did Apple just do us a favour?

Post by grahamperrin » Thu Nov 01, 2012 2:55 pm

@Patrick ah, but the benefits of Fusion Drive are not limited to HFS+ and I've been using ZEVO with CoreStorage for months, so whenever I see FUD here I think, we shouldn't associate FUD with ZEVO.

I like (but don't fully understand) the demo of issues with HFS+ … watched it briefly yesterday. (I understand that there are issues with HFS+ but I'm not so good at the command line.) Thanks.
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