Date: Wed, 11 Jun 2008 00:10:29 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Erik Trulsson <ertr1013@student.uu.se> Cc: freebsd-questions@freebsd.org, DA Forsyth <iwrtech@iwr.ru.ac.za> Subject: Re: xRAID disks.... Message-ID: <20080611000741.P13017@wojtek.tensor.gdynia.pl> In-Reply-To: <20080610193742.GA68256@owl.midgard.homeip.net> References: <484EACEB.7169.43FE1258@iwrtech.iwr.ru.ac.za> <20080610165435.M68290@wojtek.tensor.gdynia.pl> <20080610150536.GA67056@owl.midgard.homeip.net> <20080610171129.K75322@wojtek.tensor.gdynia.pl> <20080610193742.GA68256@owl.midgard.homeip.net>
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> You do not normally have that much bandwidth even in a modern machine. > Typical bandwidth for the northbridge/southbridge connection is 1-2 GB/s > for most machines sold today. (For example just about all machines with > a recent Intel desktop chipset. The connection between north- and south-bridge > on those is equivalent to a PCI-E x4 connection (which provides 1GB/s in each > direction.)) as long as it's not saturated it's not a problem. >>> with several other devices (which is not uncommon) then the reduced >>> bandwidth usage can be very useful. >> >> true. but not if it's builtin in chipset or on PCI express. > > PCI-E controller cards are still fairly uncommon, and many of them but integrated in chipset - common. > require a x4 or x8 slot, while most motherboards only have x1 slots > (apart from the x16 slot intended for a graphics card.) this slot is usable for anything. i always take some old PCI card for free for servers. as they don't need graphics anyway. on my 8-disk server i could get 95MB/s from EACH of 8 drives in parallel, still having minimal system load. it isn't anything expensive, quite cheap gigabyte motherboard with core2 duo and 2GB RAM
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