Date: Thu, 6 May 2021 07:24:00 -0600 From: Alan Somers <asomers@freebsd.org> To: Ben RUBSON <ben.rubson@gmx.com> Cc: "fs@freebsd.org" <fs@freebsd.org> Subject: Re: Dual-port SAS HDD ? Message-ID: <CAOtMX2jgrmbEefg2pJ55Bp1bJDzC3tgyjUK5%2BopvCt75T3_NDw@mail.gmail.com> In-Reply-To: <578487FF-1D89-4A9E-AD97-6B5DCD9F785A@gmx.com> References: <578487FF-1D89-4A9E-AD97-6B5DCD9F785A@gmx.com>
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On Thu, May 6, 2021 at 4:52 AM Ben RUBSON <ben.rubson@gmx.com> wrote: > Hi, > > I'm building a new ZFS pool from scratch, choosing my own hardware etc... > For sure I'll go for the standard SAS2008 / SAS3008 controller. > > However, I'm wondering whether or not I should absolutely go for dual-port > SAS HDD (with dual backplane, controller...). > I have some difficulties to find enterprise grade dual port SAS HDD. > HGST used to provide Ultrastar SAS HDD which were dual-port. > However, strangely, Western Digital does not advertise their Ultrastar DC > SAS HDD as bringing dual-port, so I guess they're not. > > Any thoughts / advices regarding this topic ? > > Many thanks for your help, > > Kind regards, > > Ben > It's just a matter of high availability. Can you tolerate an outage if a JBOD I/O controller fails? If so, then you don't need dual-port. But server crashes are more common than JBOD I/O controller failures. So you should worry more about that.
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