Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1naO7O-0002cd-Bl for pgsql-admin@arkaria.postgresql.org; Fri, 01 Apr 2022 20:43:38 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1naO7M-0005w5-6p for pgsql-admin@arkaria.postgresql.org; Fri, 01 Apr 2022 20:43:36 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1naO7L-0005vQ-SN for pgsql-admin@lists.postgresql.org; Fri, 01 Apr 2022 20:43:35 +0000 Received: from mailout.easymail.ca ([64.68.200.34]) by magus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1naO7G-0004U9-0W for pgsql-admin@lists.postgresql.org; Fri, 01 Apr 2022 20:43:34 +0000 Received: from localhost (localhost [127.0.0.1]) by mailout.easymail.ca (Postfix) with ESMTP id 588A7760DD; Fri, 1 Apr 2022 20:43:27 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at emo05-pco.easydns.vpn Received: from mailout.easymail.ca ([127.0.0.1]) by localhost (emo05-pco.easydns.vpn [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id m57Ej4q0OjRs; Fri, 1 Apr 2022 20:43:27 +0000 (UTC) Received: from smtpclient.apple (unknown [4.28.96.150]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mailout.easymail.ca (Postfix) with ESMTPSA id 01770760DC; Fri, 1 Apr 2022 20:43:26 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.60.0.1.1\)) Subject: Re: WAL & ZFS From: Scott Ribe In-Reply-To: Date: Fri, 1 Apr 2022 14:43:26 -0600 Cc: pgsql-admin Content-Transfer-Encoding: quoted-printable Message-Id: <366D89BF-6C40-46C3-9631-2EF40EDC49DD@elevated-dev.com> References: <4fe1d719-4f08-7b10-90c3-43514453757d@gmail.com> <41B83C10-CE63-467C-A613-FD457237A31B@crazybean.net> <698D568E-058B-430D-8339-ABDA350FA742@elevated-dev.com> To: Rui DeSousa X-Mailer: Apple Mail (2.3693.60.0.1.1) List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk > \On Apr 1, 2022, at 2:23 PM, Rui DeSousa wrote: >=20 > Personally and for logical reasons I would build a RAIDZ in powers of = 2; i.e. 2, 4, 8 drives plus parity and then have a stripe set of = RAIDZ2. I think your advice is all good for larger systems. For the time being, = I am using 4 drives because of purchasing decisions made before I got = here, and it turns out that RAIDZ1 is fast enough for our use, so in = this case it makes sense for the larger space. And rebuild time is not = terribly important, since we have enough boxes to have multiple = streaming replicas.=