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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Chris Rees <crees@FreeBSD.org>
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Cc: freebsd-hackers@FreeBSD.org, Matthias Apitz <guru@unixarea.de>,
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Subject: Re: proper newfs options for SSD disk
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>>
>> use tmpfs and don't fear to add /var/tmp to it.
>
> I would fear to add /var/tmp-- /var/tmp should persist across reboots.
>
> Chris
>
>
as i noted - check your case.in my case it is not a problem. it your it 
may.

Never blindly follow "rules", "good practices" etc..