Date: Mon, 25 Oct 2004 22:55:31 +0200 From: Brad Knowles <brad@stop.mail-abuse.org> To: Scott Long <scottl@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD 5.3b7and poor ata performance Message-ID: <p0600205fbda318006656@[10.0.1.3]> In-Reply-To: <417D65F1.2040809@freebsd.org> References: <14479.1098695558@critter.freebsd.dk><417D25E8.6080804@ng.fadesa .es> <200410251928.01536.victor@alf.dyndns.ws><200410251837.58257.Thoma s.Sparrev ohn@btinternet.com><417D3F12.20302@DeepCore.dk> <417D40A1.9030802@ng.fadesa.es><417D45F1.9090504@freebsd.org> <77F3FD4D-26BE-11D9-9A2F-003065ABFD92@mac.com><417D58B6.5030509@fr eebsd.org > <F5F15CA0-26C5-11D9-9A2F-003065ABFD92@mac.com> <417D65F1.2040809@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
At 2:45 PM -0600 2004-10-25, Scott Long wrote: > RAID-0 yes, RAID-10 no, at least not for software RAID. The machine > winds up having to transfer the same data twice across the PCI bus, > twice through the controller, etc. If the controller is on a simple > PCI-32/33 bus then it will quickly become saturated. I can't speak for GEOM, but my experience with vinum is that software RAID, especially RAID-1+0 will totally smoke the bare hardware, and will smoke most any PCI hardware RAID controller you put it up against. Granted, my experience is a few years old, so if you've got any more recent data that shows in detail what the current situation is and explains why, I'd love to see it. Until then, I stand by my results at <http://www.shub-internet.org/brad/FreeBSD/vinum.html>. -- Brad Knowles, <brad@stop.mail-abuse.org> "Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." -- Benjamin Franklin (1706-1790), reply of the Pennsylvania Assembly to the Governor, November 11, 1755 SAGE member since 1995. See <http://www.sage.org/>; for more info.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?p0600205fbda318006656>