Date: Sat, 15 Nov 2014 17:35:40 -0700 From: Brandon Vincent <Brandon.Vincent@asu.edu> To: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: OT-ish SATA port replicators vs. SAS "expanders" Message-ID: <CAJm423_%2B5wL4G48ftVOmmkyyjSpekS3=sv801pyquRkqcz=fTQ@mail.gmail.com> In-Reply-To: <CACpH0Me7Y%2Bm6cENsg2otcP9agDp%2BwKPGnPxDafFfySPNkhsKBA@mail.gmail.com> References: <CACpH0Me7Y%2Bm6cENsg2otcP9agDp%2BwKPGnPxDafFfySPNkhsKBA@mail.gmail.com>
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On Sat, Nov 15, 2014 at 3:42 PM, Zaphod Beeblebrox <zbeeble@gmail.com> wrote: > What is the real difference? Is it possible to hack the driver to support > (obviously not booting from) SATA port replicators on the LSI? This website has a lot of good information on the benefits of using SAS expanders versus SATA port replicators [1]. Most of the storage requirements demanded by large enterprise organizations can only be met using SAS expanders (e.g. multipath I/O). You should also consider that while SATA port replicators work, they are not as nearly as reliable as SAS expanders [2]. SAS is typically utilized for high performance storage applications that have a high reliability requirement. In the end, your choice of solution depends on your application. Are you working in a data warehouse with a five nines availability requirement or are you experimenting at home? For the later, SATA is the economical choice, while SATA doesn't quite cut it for the enterprise requirement. Where did you find that the LSI chipset doesn't support SATA port replicators? Brandon Vincent [1] http://www.sasexpanders.com [2] https://www.usenix.org/system/files/fastpw13-paper7_0.pdf
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