Date: Thu, 20 Feb 2014 14:19:24 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: Willem Jan Withagen <wjw@digiware.nl> Cc: fs@freebsd.org Subject: Re: What types of SSDs to use..... Message-ID: <CAFHbX1KedURiD_XQVixJQREkvVQzJ=XMrTGmaaGiCSE5d__GDA@mail.gmail.com> In-Reply-To: <53060C89.8040500@digiware.nl> References: <5305F8B0.1060308@digiware.nl> <783388CA2911497B98479F1187F49915@multiplay.co.uk> <53060C89.8040500@digiware.nl>
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On Thu, Feb 20, 2014 at 2:09 PM, Willem Jan Withagen <wjw@digiware.nl> wrote: > On 20-2-2014 14:06, Steven Hartland wrote: >> The "disconnect" issue is generally related to Sandforce based devices. >> >> Its a lot better on later devices / firmware and does depend on the >> controller / MB they are connected to. > > Any easy way to detect these? Or is it just a matter of reading the > specsheets? Hoping that the controller chipset is mentioned. > You can tell the old (SF-2000) chipset devices from their advertised read and write speeds - read will be 500+MBs, write will be 200-300MBs. This is because the "read speed" assumes you will be reading compressible data. I would avoid SF based drives if you can, I have had horrific experiences with OCZ Vertex 4 SSDs where they basically lock up if you do non-sequential access. Having said that, there are two parts to it, the controller and the firmware running on the controller; Intel SSDs using SF controllers, like the Intel 530, don't have such a bad reputation. Looking on wikipedia or tech review sites for a specific SSD should let you know what controller it uses, if it is not listed in the tech specs. I replaced my OCZ drives with Crucial M4, which use a Marvell controller. Cheers Tom
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