Date: Mon, 10 Sep 2001 14:27:38 -0700 From: Mike Smith <msmith@freebsd.org> To: Alexey Koptsevich <kopts@astro.ioffe.rssi.ru> Cc: freebsd-scsi@freebsd.org, freebsd-questions@freebsd.org, msmith@mass.dis.org Subject: Re: are backplanes needed for IDE RAID? Message-ID: <200109102127.f8ALRcK03624@mass.dis.org> In-Reply-To: Message from Alexey Koptsevich <kopts@astro.ioffe.rssi.ru> of "Mon, 10 Sep 2001 22:32:59 %2B0400." <Pine.BSF.4.21.0109102205430.16402-100000@astro.ioffe.rssi.ru>
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> > We are buying 3ware 7810 IDE RAID controller (supports hot-swap) and > thinking now about disk enclosures. There are some on the market (e.g., > backplane http://www.synetic.net/Synetic-Products/2-to-3-IDE.html) but I > wonder do we need them? As far as I understand, some power switching is > necessary for hot swap, but do backplanes provide any advantage against > simple mobile racks with disk power switcher? Backplanse can offer some advantages; eg. simplified mounting, better cooling, better EMI shieliding. But as long as the mounting hardware supports power switching, you should be fine. > Also, the backplane cited > above has two power connectors, are they necessary for hot-swappable power > supplies or not? No; they would just be there because a single power connector is not rated for the current draw of the entire backplane full of drives (plus it gives you some protection against connector failure, which is more common than one might like). To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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