From nobody Thu Jun 2 21:07:32 2022 X-Original-To: freebsd-questions@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 8F62E1B620AE for ; Thu, 2 Jun 2022 21:07:42 +0000 (UTC) (envelope-from 4250.82.1d4e1000039557e.9e30112126fe5e54cad47eff5bde2530@email-od.com) Received: from s1-b0c6.socketlabs.email-od.com (s1-b0c6.socketlabs.email-od.com [142.0.176.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4LDdrY4qQpz4f9K for ; Thu, 2 Jun 2022 21:07:41 +0000 (UTC) (envelope-from 4250.82.1d4e1000039557e.9e30112126fe5e54cad47eff5bde2530@email-od.com) DKIM-Signature: v=1; a=rsa-sha256; d=email-od.com;i=@email-od.com;s=dkim; c=relaxed/relaxed; q=dns/txt; t=1654204062; x=1656796062; h=content-transfer-encoding:content-type:mime-version:references:in-reply-to:message-id:subject:cc:to:from:date:x-thread-info:subject:to:from:cc:reply-to; bh=qQxRNNpcQLuMgDjJNqVcfqyIphVVXzrzVcrYe+vSDpc=; b=KDmGv5SIrjM23NDktv+JR2xllZ/uZ96s3wmfZIlAr3N3sk2W4/e/jMfol7cKEm66oVg5lIafWplCPPjpeyd67YJNN8NpxgdLqgcMsaZetUeAOr97iBJaP1J0jdbe4Pe1ygyAoP76t9scNMJ82aLwhFVvymrGLazFxHBwC3xgdVk= X-Thread-Info: NDI1MC4xMi4xZDRlMTAwMDAzOTU1N2UuZnJlZWJzZC1xdWVzdGlvbnM9ZnJlZWJzZC5vcmc= Received: from r3.us-east-1.aws.in.socketlabs.com (r3.us-east-1.aws.in.socketlabs.com [142.0.191.3]) by mxsg2.email-od.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Thu, 2 Jun 2022 17:07:34 -0400 Received: from smtp.lan.sohara.org (EMTPY [185.202.17.215]) by r3.us-east-1.aws.in.socketlabs.com with ESMTP(version=Tls12 cipher=Aes256 bits=256); Thu, 2 Jun 2022 17:07:34 -0400 Received: from [192.168.63.1] (helo=steve.lan.sohara.org) by smtp.lan.sohara.org with smtp (Exim 4.94.2 (FreeBSD)) (envelope-from ) id 1nws2W-0002pR-RH; Thu, 02 Jun 2022 22:07:32 +0100 Date: Thu, 2 Jun 2022 22:07:32 +0100 From: Steve O'Hara-Smith To: Dale Scott Cc: freebsd-questions Subject: Re: Effect of using SATA 2.x and 3.x in zfs mirrored config Message-Id: <20220602220732.358b6b81b07d35ac608c88b1@sohara.org> In-Reply-To: <1706301853.51806224.1654176891423.JavaMail.zimbra@shaw.ca> References: <1706301853.51806224.1654176891423.JavaMail.zimbra@shaw.ca> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; amd64-portbld-freebsd13.0) X-Clacks-Overhead: "GNU Terry Pratchett" List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4LDdrY4qQpz4f9K X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=email-od.com header.s=dkim header.b=KDmGv5SI; dmarc=none; spf=pass (mx1.freebsd.org: domain of 4250.82.1d4e1000039557e.9e30112126fe5e54cad47eff5bde2530@email-od.com designates 142.0.176.198 as permitted sender) smtp.mailfrom=4250.82.1d4e1000039557e.9e30112126fe5e54cad47eff5bde2530@email-od.com X-Spamd-Result: default: False [-2.70 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[email-od.com:s=dkim]; FROM_HAS_DN(0.00)[]; MV_CASE(0.50)[]; R_SPF_ALLOW(-0.20)[+ip4:142.0.176.0/20]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[sohara.org]; NEURAL_HAM_LONG(-1.00)[-1.000]; RCVD_COUNT_THREE(0.00)[4]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[email-od.com:+]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[142.0.191.3:received]; NEURAL_HAM_SHORT(-1.00)[-0.999]; MLMMJ_DEST(0.00)[freebsd-questions]; FORGED_SENDER(0.30)[steve@sohara.org,4250.82.1d4e1000039557e.9e30112126fe5e54cad47eff5bde2530@email-od.com]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:7381, ipnet:142.0.176.0/22, country:US]; FROM_NEQ_ENVFROM(0.00)[steve@sohara.org,4250.82.1d4e1000039557e.9e30112126fe5e54cad47eff5bde2530@email-od.com]; MID_RHS_MATCH_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[email-od.com:dkim] X-ThisMailContainsUnwantedMimeParts: N On Thu, 2 Jun 2022 07:34:51 -0600 (MDT) Dale Scott wrote: > Looking in dmesg, I see one of the drives is using SATA 3 (600MB/s > transfer), and the other is using SATA 2 (300MB/s transfer). Will mixing > SATA 2 and SATA 3 drives cause any technical issues? Is there any reason > why I should use SATA 2 for both drives? No reason at all to do so, but it probably wouldn't hurt either, I doubt the drives can exceed SATA 2 speeds for long if at all. ZFS won't know or care what underpins the devices. I've even mirrored a laptop SSD with an iSCSI accessed zvol on a NAS - it worked fine (I didn't try disaster recovery, that would take some thinking about) the main aim was to make a weekly scrub worthwhile. -- Steve O'Hara-Smith