Received: from localhost (maia-1.hub.org [200.46.204.191]) by postgresql.org (Postfix) with ESMTP id 501D19FB58D for ; Wed, 30 May 2007 16:59:11 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.191]) (amavisd-maia, port 10024) with ESMTP id 02633-04-2 for ; Wed, 30 May 2007 16:59:03 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.5 Received: from an-out-0708.google.com (an-out-0708.google.com [209.85.132.249]) by postgresql.org (Postfix) with ESMTP id 2A80E9FC02D for ; Wed, 30 May 2007 16:59:01 -0300 (ADT) Received: by an-out-0708.google.com with SMTP id c36so735329ana for ; Wed, 30 May 2007 12:58:58 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=Vk0gto0E6kj2GYrkX/9B/UZ33T4ubsyG5SksyxWfM6ZI2WgUyN/LoBt9FiKmooS5G3FBMnA8aEH+U4HAG/xssSqv4cOszXeueLuaujeO7TNya/eezKE4MBNrQBKPp8r7uOhMsPNH8G2jO7EZZhLSTlNgdAORvJfWybiqxTTJp1A= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=qIDn1HirJ5XzCmxk18Rw07DNPJtUmoaFxxMy3ZOdHYSZdbAnwtAB+CiZ4lBd+Z3Tq69BKF1hQ4EtxmFEbGZmlFNJHVjKjLreXnnNqeQYVhbkeZz8bAIQB5QtrjeZHxrNWiurMqbn78LSkx4DdTcoLKRfKnGSuJHQNKAH3Hk5Oj0= Received: by 10.100.229.12 with SMTP id b12mr6297097anh.1180555138880; Wed, 30 May 2007 12:58:58 -0700 (PDT) Received: by 10.100.121.15 with HTTP; Wed, 30 May 2007 12:58:58 -0700 (PDT) Message-ID: Date: Thu, 31 May 2007 01:28:58 +0530 From: "Rajesh Kumar Mallah" To: "mark@mark.mielke.cc" Subject: Re: setting up raid10 with more than 4 drives Cc: "Luke Lonergan" , "Michael Stone" , pgsql-performance@postgresql.org In-Reply-To: <20070530155733.GA18830@mark.mielke.cc> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20070530155733.GA18830@mark.mielke.cc> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200705/626 X-Sequence-Number: 25016 Sorry for posting and disappearing. i am still not clear what is the best way of throwing in more disks into the system. does more stripes means more performance (mostly) ? also is there any thumb rule about best stripe size ? (8k,16k,32k...) regds mallah On 5/30/07, mark@mark.mielke.cc wrote: > On Wed, May 30, 2007 at 08:51:45AM -0700, Luke Lonergan wrote: > > > This is standard stuff, very well proven: try googling 'self healing zfs'. > > The first hit on this search is a demo of ZFS detecting corruption of one of > > the mirror pair using checksums, very cool: > > > > http://www.opensolaris.org/os/community/zfs/demos/selfheal/;jsessionid=52508 > > D464883F194061E341F58F4E7E1 > > > > The bad drive is pointed out directly using the checksum and the data > > integrity is preserved. > > One part is corruption. Another is ordering and consistency. ZFS represents > both RAID-style storage *and* journal-style file system. I imagine consistency > and ordering is handled through journalling. > > Cheers, > mark > > -- > mark@mielke.cc / markm@ncf.ca / markm@nortel.com __________________________ > . . _ ._ . . .__ . . ._. .__ . . . .__ | Neighbourhood Coder > |\/| |_| |_| |/ |_ |\/| | |_ | |/ |_ | > | | | | | \ | \ |__ . | | .|. |__ |__ | \ |__ | Ottawa, Ontario, Canada > > One ring to rule them all, one ring to find them, one ring to bring them all > and in the darkness bind them... > > http://mark.mielke.cc/ > > > ---------------------------(end of broadcast)--------------------------- > TIP 6: explain analyze is your friend >