X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id 61B249DCD2C for ; Mon, 12 Dec 2005 00:45:54 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 19782-05 for ; Mon, 12 Dec 2005 00:45:53 -0400 (AST) X-Greylist: domain auto-whitelisted by SQLgrey- Received: from wproxy.gmail.com (wproxy.gmail.com [64.233.184.197]) by postgresql.org (Postfix) with ESMTP id 38D539DCBC1 for ; Mon, 12 Dec 2005 00:45:51 -0400 (AST) Received: by wproxy.gmail.com with SMTP id 57so1331071wri for ; Sun, 11 Dec 2005 20:45:51 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=uVus7prEe5YlV//kZEhbANPHssF0XSIVuhVMwBTqWagc2v6GTlx9nC8zSm/aIW/ZchbXTF6pX2nwEW/bEgLnhsxZKsS7P1YDQQ/vuQS6lbB0TNm/oWKSzk/zc8UWECkcyx6xPw4gVw+aQxkxx/R0/Uf94LZ0PCxisr9l0poxFUg= Received: by 10.54.153.18 with SMTP id a18mr276377wre; Sun, 11 Dec 2005 20:45:51 -0800 (PST) Received: by 10.54.86.14 with HTTP; Sun, 11 Dec 2005 20:45:51 -0800 (PST) Message-ID: <33c6269f0512112045u2dfe2393y59df6a89a7a5437a@mail.gmail.com> Date: Sun, 11 Dec 2005 23:45:51 -0500 From: Alex Turner To: Carlos Benkendorf Subject: Re: Is RAID10 the best choice? Cc: pgsql-performance@postgresql.org In-Reply-To: <20051210113423.85996.qmail@web35514.mail.mud.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline References: <20051210113423.85996.qmail@web35514.mail.mud.yahoo.com> X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0 required=5 tests=[none] X-Spam-Score: 0 X-Spam-Level: X-Archive-Number: 200512/288 X-Sequence-Number: 16109 Personaly I would split into two RAID 1s. One for pg_xlog, one for the rest. This gives probably the best performance/reliability combination. Alex. On 12/10/05, Carlos Benkendorf wrote: > Hello, > > I would like to know which is the best configuration to use 4 scsi drives > with a pg 8.1 server. > > Configuring them as a RAID10 set seems a good choice but now I=B4m figuri= ng > another configuration: > SCSI drive 1: operational system > SCSI drive 2: pg_xlog > SCSI drive 3: data > SCSI drive 4: index > > I know the difference between them when you analyze risks of loosing data > but how about performance? > > What should be better? > > Obs.: Our system uses always an index for every access.. > (enable_seqscan(false)) > > Thanks in advance! > > Benkendorf > > ________________________________ > Yahoo! doce lar. Fa=E7a do Yahoo! sua homepage. > >