From owner-freebsd-fs@FreeBSD.ORG Thu Dec 4 20:23:35 2014 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id DB020A6F for ; Thu, 4 Dec 2014 20:23:35 +0000 (UTC) Received: from mail-wi0-f173.google.com (mail-wi0-f173.google.com [209.85.212.173]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 72D53EB9 for ; Thu, 4 Dec 2014 20:23:35 +0000 (UTC) Received: by mail-wi0-f173.google.com with SMTP id r20so36021715wiv.6 for ; Thu, 04 Dec 2014 12:23:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type :content-transfer-encoding; bh=ufMAIIpcKsi1FZ2Cq3eQCkn/n+dIooeokqZN8sokmyE=; b=Km2iAkIUmORGPSSaK/BDpRBz0u/JzfhYd2RIFaBKZcwjse7vplsHHi8TucU1HZzhSJ ZYSKS5im6OtOysm1SVl0zOx2MKysj8G1BQxiSgfYzDYXURBTK/rNsrX2qPaYk167DxUt vszOwj+f+D0bDEXoDbfwIUzcoyJmlJjcyHYiDQANa4owIzT19Ejg8e9cFmTkjI4X4O/B CFBfg8PYMNsLdu3NClp8IInKS5EZMGkBRx1WRrKgjFZM5l8cnpNdfh5BgknrJrI2vIf7 XXyhKIeh63IX1guTf4gj/q96arAFmUXQ1/XDnQynVfQomvJW+BdaCDFNFvAYY0rRuquh a6JQ== X-Gm-Message-State: ALoCoQmUzqME1P77vEniLaVpG9oxyFfDHLpIVScjJpqDS/Y3lxp5b6tK8sNYqUqKzb15s48l5auB X-Received: by 10.194.187.235 with SMTP id fv11mr18865301wjc.16.1417724607696; Thu, 04 Dec 2014 12:23:27 -0800 (PST) Received: from [10.10.1.68] (82-69-141-170.dsl.in-addr.zen.co.uk. [82.69.141.170]) by mx.google.com with ESMTPSA id n3sm56410564wiw.5.2014.12.04.12.23.26 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 04 Dec 2014 12:23:26 -0800 (PST) Message-ID: <5480C336.8020901@multiplay.co.uk> Date: Thu, 04 Dec 2014 20:25:26 +0000 From: Steven Hartland User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: freebsd-fs@freebsd.org Subject: Re: ASHIFT=13 by default. References: In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 04 Dec 2014 20:23:35 -0000 If thats the case the underlying storage will be reporting a logical block size of 8k. Assuming that's the case then this is expected / correct behavior. On 04/12/2014 19:05, Zaphod Beeblebrox wrote: > So... I think I answered at least a small part of my confusion with the > test ZFS datasets. I created them with 'zpool create vrx raidz > /dev/zvol/*' ... and it would appear that the default behavior for this is > to assign ASHIFT to be 13 ... which makes these test pools rater > unrepresentative of ordinary zfs pools. > > That means that many people using test ZFS pools are testing with 8k blocks > (not even just 4k blocks). While I can immediately understand what I need > to do to get a representative test, I'm posting because other people may > have been similarly confused. > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"