Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1UfCuN-0008C2-PY for pgsql-performance@arkaria.postgresql.org; Wed, 22 May 2013 17:33:03 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.72) (envelope-from ) id 1UfCuN-00056b-2O for pgsql-performance@arkaria.postgresql.org; Wed, 22 May 2013 17:33:03 +0000 Received: from makus.postgresql.org ([2001:4800:7903:4::125]) by malur.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1UfCuL-00056V-UO for pgsql-performance@postgresql.org; Wed, 22 May 2013 17:33:02 +0000 Received: from server13-scl.nuevasync.com ([64.13.138.208] helo=mail.nuevasync.com) by makus.postgresql.org with esmtp (Exim 4.80) (envelope-from ) id 1UfCuB-0001Lx-N9 for pgsql-performance@postgresql.org; Wed, 22 May 2013 17:33:01 +0000 Received: from [192.168.16.2] (unknown [69.51.127.178]) by mail.nuevasync.com (Postfix) with ESMTP id 03FDB4594A4 for ; Wed, 22 May 2013 11:32:36 -0600 (MDT) Message-ID: <519D0107.4000600@boreham.org> Date: Wed, 22 May 2013 11:31:51 -0600 From: David Boreham User-Agent: Mozilla/5.0 (Windows NT 6.2; rv:17.0) Gecko/20130328 Thunderbird/17.0.5 MIME-Version: 1.0 To: pgsql-performance@postgresql.org Subject: Re: Reliability with RAID 10 SSD and Streaming Replication References: <51957499.6050905@fuzzy.cz> <519991EB.8010208@2ndQuadrant.com> <519A8E29.60702@fuzzy.cz> <519C0EFD.9080002@2ndQuadrant.com> <519CD3BD.3010305@2ndQuadrant.com> In-Reply-To: <519CD3BD.3010305@2ndQuadrant.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Pg-Spam-Score: 0.8 (/) 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 On 5/22/2013 8:18 AM, Greg Smith wrote: > > They can easily hit that number. Or they can do this: > > Device: r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm > %util > sdd 2702.80 19.40 19.67 0.16 14.91 273.68 71.74 0.37 100.00 > sdd 2707.60 13.00 19.53 0.10 14.78 276.61 90.34 0.37 100.00 > > That's an Intel 710 being crushed by a random read database server > workload, unable to deliver even 3000 IOPS / 20MB/s. I have hours of > data like this from several servers. This is interesting. Do you know what it is about the workload that leads to the unusually low rps ? -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance