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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB598C05027 for ; Sat, 4 Feb 2023 02:20:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230042AbjBDCUZ (ORCPT ); Fri, 3 Feb 2023 21:20:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229657AbjBDCUY (ORCPT ); Fri, 3 Feb 2023 21:20:24 -0500 Received: from www18.qth.com (www18.qth.com [69.16.238.59]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 42C221CAE3 for ; Fri, 3 Feb 2023 18:20:22 -0800 (PST) Received: from [73.207.192.158] (port=33188 helo=jpo) by www18.qth.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1pO8A9-0002RF-07 for linux-raid@vger.kernel.org; Fri, 03 Feb 2023 20:20:21 -0600 Date: Sat, 4 Feb 2023 02:20:19 +0000 From: David Thorburn-Gundlach To: Linux RAID list Subject: Re: how to know a hard drive will mix well Message-ID: <20230204022019.GI25616@jpo> References: <20230202124306.GH25616@jpo> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - www18.qth.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - justpickone.org X-Get-Message-Sender-Via: www18.qth.com: authenticated_id: dmail@justpickone.org X-Authenticated-Sender: www18.qth.com: dmail@justpickone.org X-Source: X-Source-Args: X-Source-Dir: Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org Roger, et al -- ...and then Roger Heflin said... % I have mixed many drives, I have never really had a major slowness. At Good to know. % worst you will be limited by the drive with the slowest seeks/transfer % rate. So long as one disk's RPM is not significantly different you should That's pretty much what I was wondering, but I imagine if it's the same RPM and the same cache and the same SATA rate it should be ... about the same. % not notice it, unless you are running your array right at the limit. Hmmph. I'm not entirely sure I'm not anyway, but it is just a little PC mobo running primary and daughtercard SATA ports. A Real Server (tm) is far, far beyond the current horizon :-) % % Technically you may want to also look at another parm that is the sustained % transfer rate range coming off the platter. This will be a range that is [snip] Oh, thanks! Sounds good. HAND :-D -- David T-G See http://justpickone.org/davidtg/email/ See http://justpickone.org/davidtg/tofu.txt