From owner-freebsd-fs@FreeBSD.ORG Fri Dec 5 00:16:11 2014 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id E7183EA3 for ; Fri, 5 Dec 2014 00:16:11 +0000 (UTC) Received: from mail-ob0-x22c.google.com (mail-ob0-x22c.google.com [IPv6:2607:f8b0:4003:c01::22c]) (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 A963BD7C for ; Fri, 5 Dec 2014 00:16:11 +0000 (UTC) Received: by mail-ob0-f172.google.com with SMTP id wn1so14302273obc.31 for ; Thu, 04 Dec 2014 16:16:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=jyllO7F/6ALWqAm5WTY5HmCRzSYH3PRB/rM33AoryuE=; b=ryQHDcGKzYNL4tHs8arSW0tiitzXkeTnDBpjOCfSCMoi3WubKUAaggZY7mKHjxL3on UVfmFpP3XsVH51ouiLxRsfWZFskuB9likjvmxgQR+w52hsffJ2aqaC79HdpzvULNQDwR 1TVlFc6RlnUripOZ4upz6rjtQp0HjGPizbElV7r0lh5hTiWxJvpGWe5z3cuzrn+Ftj5I 3UBfAroaEZfbDhzu1u9SkEF0w8fQyaO2ltDq/SdVc0uOYPv/yeldPkjnvWtFBiGCMK3v 5IGsTRQfRufTkwlDtxmpPp0BE1ojbcvbrZRhtQm83wrCiCN+z8Cs7ShVD8UnsuCb7tMh mIbw== MIME-Version: 1.0 X-Received: by 10.60.117.99 with SMTP id kd3mr2282729oeb.35.1417738571023; Thu, 04 Dec 2014 16:16:11 -0800 (PST) Received: by 10.76.0.138 with HTTP; Thu, 4 Dec 2014 16:16:10 -0800 (PST) In-Reply-To: <5480C336.8020901@multiplay.co.uk> References: <5480C336.8020901@multiplay.co.uk> Date: Thu, 4 Dec 2014 19:16:10 -0500 Message-ID: Subject: Re: ASHIFT=13 by default. From: Zaphod Beeblebrox To: Steven Hartland Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.18-1 Cc: freebsd-fs 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: Fri, 05 Dec 2014 00:16:12 -0000 Well in this case the "space" was a file created with zfs create -V 10g On Thu, Dec 4, 2014 at 3:25 PM, Steven Hartland wrote: > 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" >> > > _______________________________________________ > 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" >