Date: Thu, 10 Sep 2015 13:42:35 -0400 From: Paul Kraus <paul@kraus-haus.org> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Replacing Drive with SSD Message-ID: <08306F31-955B-4710-B20B-4F2ABE0CBA56@kraus-haus.org> In-Reply-To: <867fnywc8i.fsf@WorkBox.Home> References: <CEAD84AD-341A-4FB9-A3A1-D0D5A550AFFD@lafn.org> <alpine.BSF.2.20.1508281235390.74312@wonkity.com> <20150829220311.c7608be1.freebsd@edvax.de> <alpine.BSF.2.20.1508300633160.44682@wonkity.com> <55E45973.2050103@sneakertech.com> <alpine.BSF.2.20.1508311000550.42983@wonkity.com> <55E4865B.1000104@sneakertech.com> <20150831181135.7682a810@gumby.homeunix.com> <867fnywc8i.fsf@WorkBox.Home>
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On Sep 10, 2015, at 11:00, Brandon J. Wandersee = <brandon.wandersee@gmail.com> wrote: > Leaving blocks unpartitioned doesn't mean those blocks won't be = written > to; it just ensures that a certain amount of space (and so a certain > number of blocks/cells) must always be free, forcing writes to be = spread > across different physical portions of the disk in a relatively even > manner. It's my understanding that this over-provisioning isn't > exactly necessary in most SSDs nowadays. It just serves as a stronger > guarantee than entrusting everything to a drive's firmware. Each SSD model has some amount of over provisioning built in. The more = expensive, Enterprise grade SSDs have more (in many cases much more) = than the cheaper consumer units. So based on the performance you need = and the SSD you have, it is still prudent to manually over provision = with unpartitioned space. Note that some vendors will tell you about their over provisioning and = others don=92t. -- Paul Kraus paul@kraus-haus.org
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