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 1na3kA-0002EU-3J for pgsql-admin@arkaria.postgresql.org; Thu, 31 Mar 2022 22:58:18 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1na3k7-0007Lg-Gl for pgsql-admin@arkaria.postgresql.org; Thu, 31 Mar 2022 22:58:15 +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 1na3k7-0007LV-6Q for pgsql-admin@lists.postgresql.org; Thu, 31 Mar 2022 22:58:15 +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 1na3k4-0001t6-EE for pgsql-admin@lists.postgresql.org; Thu, 31 Mar 2022 22:58:14 +0000 Received: from localhost (localhost [127.0.0.1]) by mailout.easymail.ca (Postfix) with ESMTP id 992B9C8EB8; Thu, 31 Mar 2022 22:58:09 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at emo01-pco.easydns.vpn Received: from mailout.easymail.ca ([127.0.0.1]) by localhost (emo01-pco.easydns.vpn [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bqbvQ5XUDqDq; Thu, 31 Mar 2022 22:58:09 +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 1DCFCC8DB8; Thu, 31 Mar 2022 22:58:09 +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: <35c98a4b-f7a1-a896-4484-582bbaaffb5b@jakobs.com> Date: Thu, 31 Mar 2022 16:58:08 -0600 Cc: pgsql-admin@lists.postgresql.org Content-Transfer-Encoding: quoted-printable Message-Id: <61E764EB-0038-4438-83D0-C50036FFB032@elevated-dev.com> References: <43EEBE2E-4C7F-4F35-99BF-4DA8B5D3828A@crazybean.net> <35c98a4b-f7a1-a896-4484-582bbaaffb5b@jakobs.com> To: Holger Jakobs 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 Mar 31, 2022, at 4:47 PM, Holger Jakobs wrote: >=20 > The WAL is a journal itself and doesn't need another journal for = safety. Therefore, a common recommendation is using ext2 (which has no = journal) for the WAL partition. >=20 > Is this correct? I could see that being reasonable. In this case I don't control number = and size of drives, and have a layout where it's really best in terms of = utilization to put them all into the zpool. So my options are limited to = ZFS options.=