X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id 81988DB84A for ; Wed, 16 Nov 2005 10:38:01 -0400 (AST) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 17620-03 for ; Wed, 16 Nov 2005 14:38:04 +0000 (GMT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from floppy.pyrenet.fr (floppy.pyrenet.fr [194.116.145.2]) by svr1.postgresql.org (Postfix) with ESMTP id 3C31EDB28E for ; Wed, 16 Nov 2005 10:37:58 -0400 (AST) Received: by floppy.pyrenet.fr (Postfix, from userid 106) id 63F5831058; Wed, 16 Nov 2005 15:38:02 +0100 (MET) From: William Yu X-Newsgroups: pgsql.performance Subject: Re: Hardware/OS recommendations for large databases ( Date: Wed, 16 Nov 2005 06:37:48 -0800 Organization: Hub.Org Networking Services Lines: 11 Message-ID: References: <3E37B936B592014B978C4415F90D662D01995F7B@MI8NYCMAIL06.Mi8.com> <33c6269f0511152116s4483af82s91c711b1b902da14@mail.gmail.com> <41AD9695-69AC-4677-AEBD-9D9E21BD8DCF@advfn.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@news.hub.org User-Agent: Mozilla Thunderbird 1.0 (X11/20041206) X-Accept-Language: en-us, en In-Reply-To: <41AD9695-69AC-4677-AEBD-9D9E21BD8DCF@advfn.com> To: pgsql-performance@postgresql.org X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0 required=5 tests=[AWL=0.000] X-Spam-Score: 0 X-Spam-Level: X-Archive-Number: 200511/276 X-Sequence-Number: 15533 Alex Stapleton wrote: > Your going to have to factor in the increased failure rate in your cost > measurements, including any downtime or performance degradation whilst > rebuilding parts of your RAID array. It depends on how long your > planning for this system to be operational as well of course. If we go 32xRAID10, rebuild time should be the same as rebuild time in a 4xRAID10 system. Only the hard drive that was replaced needs rebuild -- not the entire array. And yes, definitely need a bunch of drives lying around as spares.