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 7FAE39DC81A for ; Sun, 25 Dec 2005 11:10:04 -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 95866-03 for ; Sun, 25 Dec 2005 11:10:08 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from wolff.to (wolff.to [66.93.197.194]) by postgresql.org (Postfix) with SMTP id 3C0759DC80C for ; Sun, 25 Dec 2005 11:10:01 -0400 (AST) Received: (qmail 18283 invoked by uid 500); 25 Dec 2005 15:15:43 -0000 Date: Sun, 25 Dec 2005 09:15:43 -0600 From: Bruno Wolff III To: Luke Lonergan Cc: David Lang , Frank Wiles , Juan Casero , pgsql-performance@postgresql.org Subject: Re: What's the best hardver for PostgreSQL 8.1? Message-ID: <20051225151543.GB11637@wolff.to> Mail-Followup-To: Bruno Wolff III , Luke Lonergan , David Lang , Frank Wiles , Juan Casero , pgsql-performance@postgresql.org References: <3E37B936B592014B978C4415F90D662D01F1B59F@MI8NYCMAIL06.Mi8.com> <3E37B936B592014B978C4415F90D662D01F47552@MI8NYCMAIL06.Mi8.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3E37B936B592014B978C4415F90D662D01F47552@MI8NYCMAIL06.Mi8.com> User-Agent: Mutt/1.4.2.1i X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.024 required=5 tests=[AWL=0.024] X-Spam-Score: 0.024 X-Spam-Level: X-Archive-Number: 200512/610 X-Sequence-Number: 16431 On Sat, Dec 24, 2005 at 22:13:43 -0500, Luke Lonergan wrote: > David, > > > now hot-swap may not be supported on all interface types, that may be what > > you have run into, but with SCSI or SATA you should be able to hot-swap > > with the right controller. > > That's actually the problem - Linux hot swap is virtually non-functional for SCSI. You can write into the proper places in /proc, then remove and rescan to get a new drive up, but I've found that the resulting OS state is flaky. This is true of the latest 2.6 kernels and LSI and Adaptec SCSI controllers. > > The problems I've seen are with Linux, not the controllers. The other option is to keep hot spares available so that you can have a failure or two before you have to pull drives out. This might allow you to get to a maintenance window to swap out the bad drives.