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From: "Steven Hartland" <killing@multiplay.co.uk>
To: "Garrett Wollman" <wollman@csail.mit.edu>
References: <21197.39676.138433.937002@khavrinen.csail.mit.edu><430F34AB88D44C4BAF31DDC7AD214137@multiplay.co.uk><21197.47504.93295.771468@khavrinen.csail.mit.edu><CE07448557D04B6DAD7A2A1636EC462A@multiplay.co.uk>
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Subject: Re: Attempting ATA TRIM on SAS devices?
Date: Wed, 8 Jan 2014 23:57:57 -0000
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----- Original Message ----- 
From: "Garrett Wollman" <wollman@csail.mit.edu>


> <<On Wed, 8 Jan 2014 21:27:34 -0000, "Steven Hartland" <killing@multiplay.co.uk> said:
> 
>> I know its spec says its SAS but can you plug this drive into a
>> SATA controller such as on board Intel controller?
> 
> Not easily; it's in a separate enclosure.  It does have the standard
> dual-port SAS connector on it, and we are running it dual-ported
> (active/passive, not active/active, at least for the moment).
> 
>> If so does work and then it correctly support delete's?
> 
> I don't have any way to confirm this.  We're just using these drives
> as ZFS cache, so it doesn't make a huge difference to us one way or
> the other.

You could just force the delete_method to UNMAP then:
kern.cam.da.X.delete_method=UNMAP

    Regards
    Steve


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