Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bLSwl-0003Lj-Kj for pgsql-performance@arkaria.postgresql.org; Fri, 08 Jul 2016 10:23:47 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.84_2) (envelope-from ) id 1bLSwl-0004Vh-80 for pgsql-performance@arkaria.postgresql.org; Fri, 08 Jul 2016 10:23:47 +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 4.84_2) (envelope-from ) id 1bLSwk-0004V2-8p for pgsql-performance@postgresql.org; Fri, 08 Jul 2016 10:23:46 +0000 Received: from vms173009pub.verizon.net ([206.46.173.9]) by magus.postgresql.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.84_2) (envelope-from ) id 1bLSwg-0003am-29 for pgsql-performance@postgresql.org; Fri, 08 Jul 2016 10:23:45 +0000 Received: from vz-proxy-m003.mx.aol.com ([64.236.83.2]) by vms173009.mailsrvcs.net (Oracle Communications Messaging Server 7.0.5.32.0 64bit (built Jul 16 2014)) with ESMTPA id <0O9Z006JSRJEEM30@vms173009.mailsrvcs.net> for pgsql-performance@postgresql.org; Fri, 08 Jul 2016 05:23:38 -0500 (CDT) X-CMAE-Score: 0 X-CMAE-Analysis: v=2.1 cv=Nc0brD34 c=1 sm=1 tr=0 a=EDCZS3Slg7tGr17y9w9vtg==:117 a=IkcTkHD0fZMA:10 a=cAmyUtKerLwA:10 a=oct3qPWNAAAA:8 a=9BffT2KlCwqoBGQlt44A:9 a=QEXdDO2ut3YA:10 Received: by 100.35.160.71 with SMTP id 19ab7083; Fri, 08 Jul 2016 10:23:38 GMT To: pgsql-performance@postgresql.org From: Jean-David Beyer Subject: Capacitors, etc., in hard drives and SSD for DBMS machines... Organization: Institute for Regimented Whimsey Message-id: <577F7F2A.10307@verizon.net> Date: Fri, 08 Jul 2016 06:23:38 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-transfer-encoding: 7bit X-Pg-Spam-Score: -3.1 (---) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-performance Precedence: bulk Sender: pgsql-performance-owner@postgresql.org Why all this concern about how long a disk (or SSD) drive can stay up after a power failure? It seems to me that anyone interested in maintaining an important database would have suitable backup power on their entire systems, including the disk drives, so they could coast over any power loss. I do not have any database that important, but my machine has an APC Smart-UPS that has 2 1/2 hours of backup time with relatively new batteries in it. It is so oversize because my previous computer used much more power than this one does. And if my power company has a brown out or black out of over 7 seconds, my natural gas fueled backup generator picks up the load very quickly. Am I overlooking something? -- .~. Jean-David Beyer Registered Linux User 85642. /V\ PGP-Key:166D840A 0C610C8B Registered Machine 1935521. /( )\ Shrewsbury, New Jersey http://linuxcounter.net ^^-^^ 06:15:01 up 36 days, 12:17, 2 users, load average: 4.16, 4.26, 4.30 -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance