From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 038B7C3A5A0 for ; Mon, 19 Aug 2019 16:24:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CAD6822CE3 for ; Mon, 19 Aug 2019 16:24:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727268AbfHSQYh (ORCPT ); Mon, 19 Aug 2019 12:24:37 -0400 Received: from guest-port.merlins.org ([173.11.111.148]:43504 "EHLO mail1.merlins.org" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1726905AbfHSQYh (ORCPT ); Mon, 19 Aug 2019 12:24:37 -0400 Received: from merlin by mail1.merlins.org with local (Exim 4.92 #3) id 1hzkSS-0002vb-1q by authid ; Mon, 19 Aug 2019 09:24:36 -0700 Date: Mon, 19 Aug 2019 09:24:36 -0700 From: Marc MERLIN To: o1bigtenor Cc: linux-block@vger.kernel.org, Linux-RAID Subject: Re: 5.1.21 Dell 2950 terrible swraid5 I/O performance with swraid on top of Perc 5/i raid0/jbod Message-ID: <20190819162436.GE5431@merlins.org> References: <20190819070823.GH12521@merlins.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Sysadmin: BOFH X-URL: http://marc.merlins.org/ User-Agent: Mutt/1.5.13 (2006-08-11) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: marc@merlins.org Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Mon, Aug 19, 2019 at 06:42:23AM -0500, o1bigtenor wrote: > On Mon, Aug 19, 2019 at 2:35 AM Marc MERLIN wrote: > > > > (Please Cc me on replies so that I can see them more quickly) > > > > Dear Block Folks, > > > > I just inherited a Dell 2950 with a Perc 5/i. > > I really don't want to use that Perc 5/i card, but from all the reading > > I did, there is no IT/unraid mode for it, so I was stuck setting the 6 > > 2TB drives as 6 independent raid0 drives using the card. > > I wish I could just bypass the card and connect the drives directly to a > > sata card, but the case and backplane do not seem to make this possible. > > Not to discourage you from a possibly interesting and fruitful endeavor > but when I bought myself a slightly newer dell server I traded out the > PERC card for a newer version (model 700 IIRC) and then I things > were quite a big different. Said board, bought used, wasn't very > expensive. YMMV Thanks for that suggestion. Indeed, I'd like nothing more than to get rid of that Perc 5/i card, even if it can't be as bad as what I'm seeing. That said, from some reading, an H700 isn't just a swap in replacement, it doesn't use the same cables from what I can tell. https://www.serversupply.com/products/part_search/pid_lookup.asp?pid=312363&gclid=CjwKCAjwkenqBRBgEiwA-bZVtsIuJabv8vB5F8teo0XxgozYWxwNCS7N5Ar1fVQjvaBkRsQtelRlBhoC3f0QAvD_BwE Perc 6/i does use the same cables, but it's barely a better card than 5/i https://www.newegg.com/p/14G-000T-001F5?item=9SIA9AX8NB4437&source=region&nm_mc=knc-googlemkp-pc&cm_mmc=knc-googlemkp-pc-_-pla-splus+technologies-_-hard+drive+controllers+%2f+raid+cards-_-9SIA9AX8NB4437&gclid=CjwKCAjwkenqBRBgEiwA-bZVtnNFqB4fWVPzKkZn_utZwhgYrnBDyKRrafTgRdX2AlHK9NiXr4sxGxoCDqgQAvD_BwE&gclsrc=aw.ds Best, Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/