From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joel Jaeggli Subject: Re: Linux: Why software RAID? Date: Mon, 04 Sep 2006 10:31:12 -0700 Message-ID: <44FC62E0.6030202@uoregon.edu> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <44FC62EF.7040100@tmr.com> Sender: linux-raid-owner@vger.kernel.org To: Bill Davidsen Cc: Alan Cox , Marc Perkel , Adam Kropelin , Jeff Garzik , Linux Kernel , Linux RAID Mailing List List-Id: linux-raid.ids 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