From mboxrd@z Thu Jan 1 00:00:00 1970 From: Janek Kozicki Subject: which raid level gives maximum overall speed? (raid-10,f2 vs. raid-0) Date: Wed, 30 Jan 2008 19:21:33 +0100 Message-ID: <20080130192133.17b254bf@szpak> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hello, Yes, I know that some levels give faster reading and slower writing, etc. I want to talk here about a typical workstation usage: compiling stuff (like kernel), editing openoffice docs, browsing web, reading email (email: I have a webdir format, and in boost mailing list directory I have 14000 files (posts), opening this directory takes circa 10 seconds in sylpheed). Moreover, opening .pdf files, more compiling of C++ stuff, etc... I have a remote backup system configured (with rsnapshot), which does backups two times a day. So I'm not afraid to lose all my data due to disc failure. I want absolute speed. Currently I have Raid-0, because I was thinking that this one is fastest. But I also don't need twice the capacity. I could use Raid-1 as well, if it was faster. Due to recent discussion about Raid-10,f2 I'm getting worried that Raid-0 is not the fastest solution, but instead a Raid-10,f2 is faster. So how really is it, which level gives maximum overall speed? I would like to make a benchmark, but currently, technically, I'm not able to. I'll be able to do it next month, and then - as a result of this discussion - I will switch to other level and post here benchmark results. How does overall performance change with the number of available drives? Perhaps Raid-0 is best for 2 drives, while Raid-10 is best for 3, 4 and more drives? best regards -- Janek Kozicki |