Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1etHnO-0004mc-R2 for pgsql-admin@arkaria.postgresql.org; Tue, 06 Mar 2018 18:58:42 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.89) (envelope-from ) id 1etHnN-0004gV-7y for pgsql-admin@arkaria.postgresql.org; Tue, 06 Mar 2018 18:58:41 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1etHnN-0004gH-0Y for pgsql-admin@lists.postgresql.org; Tue, 06 Mar 2018 18:58:41 +0000 Received: from mail.thelabyrinth.net ([45.56.70.56]) by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1etHnK-0007zZ-Ha for pgsql-admin@lists.postgresql.org; Tue, 06 Mar 2018 18:58:40 +0000 Received: from Davids-iMac.local (unknown [173.169.74.224]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: dsteele) by mail.thelabyrinth.net (Postfix) with ESMTPSA id A7DD154683; Tue, 6 Mar 2018 18:58:36 +0000 (UTC) Subject: Re: Reliable WAL file shipping over unreliable network To: Rui DeSousa Cc: Stephen Frost , pgsql-admin@lists.postgresql.org References: <6056907B-551F-4ED0-804B-0FCACD39EB23@icloud.com> <988AB20C-9FDE-4197-BF3F-C54D80C2ED78@elevated-dev.com> <20180302180911.GO2416@tamriel.snowman.net> <20180304150640.GR2416@tamriel.snowman.net> <3D9CC2FB-57E1-45B2-B5FC-1B214F5DB068@icloud.com> <20180305111521.GV2416@tamriel.snowman.net> <20180305150218.GY2416@tamriel.snowman.net> <15F9D550-9909-40B3-A384-417AFCD745DF@icloud.com> <3EF1FB1B-265A-4283-8201-0A4F99A4B699@icloud.com> From: David Steele Message-ID: <1f90c51e-0f7a-1d67-c35a-90f42314cd79@pgmasters.net> Date: Tue, 6 Mar 2018 13:58:35 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <3EF1FB1B-265A-4283-8201-0A4F99A4B699@icloud.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk On 3/6/18 1:53 PM, Rui DeSousa wrote: > >> On Mar 6, 2018, at 1:47 PM, David Steele > > wrote: >> >> It's true that there are no good base utilities for this purpose, not >> sure why NFS would be an exception, though. > > NFS file writes are synchronous writes on the NFS server — unless you > make them asynchronous which makes for a bad NFS server. In my experience this is common -- because it gives better performance and most people don't understand the risks. -- -David david@pgmasters.net