Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964966AbWIDRcO (ORCPT ); Mon, 4 Sep 2006 13:32:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964965AbWIDRcO (ORCPT ); Mon, 4 Sep 2006 13:32:14 -0400 Received: from mserv2.uoregon.edu ([128.223.142.41]:13742 "EHLO smtp.uoregon.edu") by vger.kernel.org with ESMTP id S964963AbWIDRcN (ORCPT ); Mon, 4 Sep 2006 13:32:13 -0400 Message-ID: <44FC62E0.6030202@uoregon.edu> Date: Mon, 04 Sep 2006 10:31:12 -0700 From: Joel Jaeggli User-Agent: Thunderbird 1.5.0.5 (Windows/20060719) MIME-Version: 1.0 To: Bill Davidsen CC: Alan Cox , Marc Perkel , Adam Kropelin , Jeff Garzik , Linux Kernel , Linux RAID Mailing List Subject: Re: Linux: Why software RAID? References: <20060824090741.J30362@mail.kroptech.com> <1156425650.3007.140.camel@localhost.localdomain> <44EDB843.2020608@perkel.com> <1156432892.3007.155.camel@localhost.localdomain> <44FC62EF.7040100@tmr.com> In-Reply-To: <44FC62EF.7040100@tmr.com> X-Enigmail-Version: 0.94.1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1314 Lines: 35 Bill Davidsen wrote: > Alan Cox wrote: > >> Ar Iau, 2006-08-24 am 07:31 -0700, ysgrifennodd Marc Perkel: >> >> >>> So - the bottom line answer to my question is that unless you are >>> running raid 5 and you have a high powered raid card with cache and >>> battery backup that there is no significant speed increase to use >>> hardware raid. For raid 0 there is no advantage. >>> >>> >> If your raid is entirely on PCI plug in cards and you are doing RAID1 >> there is a speed up using hardware assisted raid because of the PCI bus >> contention. >> > > I would expect to see this with RAID5 as well, for the same reason... assuming you actually have lots of pci contention that might be a consideration... if you're sitting on server class hardware with multiple pci buses or using pci-express cards that won't be a significant issue. -- ------------------------------------------------------------------------ Joel Jaeggli Unix Consulting joelja@uoregon.edu GPG Key Fingerprint: 5C6E 0104 BAF0 40B0 5BD3 C38B F000 35AB B67F 56B2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/