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=-5.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS 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 6C3C2C433E6 for ; Fri, 28 Aug 2020 03:05:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE26C20786 for ; Fri, 28 Aug 2020 03:05:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=sabi.unospace.net header.i=@sabi.unospace.net header.b="uA+OefOA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727845AbgH1DFR (ORCPT ); Thu, 27 Aug 2020 23:05:17 -0400 Received: from azure.uno.uk.net ([95.172.254.11]:40998 "EHLO azure.uno.uk.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726972AbgH1DFQ (ORCPT ); Thu, 27 Aug 2020 23:05:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sabi.unospace.net; s=default; h=From:References:In-Reply-To:Subject:To:Date :Message-ID:Content-Transfer-Encoding:Content-Type:MIME-Version:Sender: Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=L7ZbwlTr9Y25NTYWApgN+6UDjupaGsVUqBP5cdV0wIQ=; b=uA+OefOAX7CR53F28TThxul5rE T65RujJ48V3zWGU1Qi8IxJG6XzvoRbFlCJTAPCrOVKVgmUbLcpfssKRZOVmDin08Ybx/TJHcRe0Wm Ho6EoNsWUPbw7M9Uf/Oa8Ai51wwIgvtGSO7GIMmdzUtXkclm6VKVrRQfQVJGjQxTH6ryhMdXr11d1 ufhF/vuQ2mXOoTwXM1tkrFsS+BlEZ0vqqvmQVEACAdkd9qxuHxF/gciLYuzZmP5aVTNRIBnnePije E7VVq3qnKhkGt572StyD02AJXd5E55riD+C/Cc6VszfchacmJtCO9D1djhemVQSxOSwiWdlQTzvqN BCBANDuQ==; Received: from [95.172.224.50] (port=54258 helo=ty.sabi.co.UK) by azure.uno.uk.net with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.93) (envelope-from ) id 1kBUhW-0002Y2-JA for linux-raid@vger.kernel.org; Fri, 28 Aug 2020 04:05:14 +0100 Received: from from [127.0.0.1] (helo=cyme.ty.sabi.co.uk) by ty.sabi.co.UK with esmtps(Cipher TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256)(Exim 4.93 5) id 1kBUhQ-00DVjZ-OZ for ; Fri, 28 Aug 2020 04:05:08 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <24392.29796.81915.842904@cyme.ty.sabi.co.uk> Date: Fri, 28 Aug 2020 04:05:08 +0100 To: Linux Raid Subject: Re: Best way to add caching to a new raid setup. In-Reply-To: <16cee7f2-38d9-13c8-4342-4562be68930b@verizon.net> References: <16cee7f2-38d9-13c8-4342-4562be68930b.ref@verizon.net> <16cee7f2-38d9-13c8-4342-4562be68930b@verizon.net> X-Mailer: VM 8.2.0b under 26.3 (x86_64-pc-linux-gnu) From: pg@mdraid.list.sabi.co.UK (Peter Grandi) X-Disclaimer: This message contains only personal opinions X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - azure.uno.uk.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - root.t00.sabi.co.uk X-Get-Message-Sender-Via: azure.uno.uk.net: authenticated_id: sabity@sabi.unospace.net X-Authenticated-Sender: azure.uno.uk.net: sabity@sabi.unospace.net X-Source: X-Source-Args: X-Source-Dir: Sender: linux-raid-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org > I have two raid6s running on mythbuntu 14.04. The are built on > 6 enterprise drives. [...] want to build new raid using the > 16/14tb drives. [...] This may be the beginning of an exciting adventure into setting up a RAID set with stunning rebuild times, minimizing IOPS-per-TB and setting up filetrees that cannot be realistically 'fsck'ed. Plenty of people seem to like that kind of exciting adventure :-).