From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from [195.159.176.226] ([195.159.176.226]:58633 "EHLO blaine.gmane.org" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752603AbcK3CNz (ORCPT ); Tue, 29 Nov 2016 21:13:55 -0500 Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1cBuP5-0002eV-9Z for linux-btrfs@vger.kernel.org; Wed, 30 Nov 2016 03:13:47 +0100 To: linux-btrfs@vger.kernel.org From: Duncan <1i5t5.duncan@cox.net> Subject: Re: True size of btrfs data chunk Date: Wed, 30 Nov 2016 02:13:38 +0000 (UTC) Message-ID: References: <44a745cd-ebb0-e62b-371c-8a37edd951fb@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Austin S. Hemmelgarn posted on Tue, 29 Nov 2016 09:58:50 -0500 as excerpted: > On 2016-11-29 09:32, Timofey Titovets wrote: >> Hi, as wiki say https://btrfs.wiki.kernel.org/index.php/Glossary: Bad link. Without the terminating colon it works, however. https://btrfs.wiki.kernel.org/index.php/Glossary >> A part of a block group. Chunks are either 1 GiB in size (for data) or >> 256 MiB (for metadata). > This is only about the normal case. Chunks are variable in size. In > most cases, data chunks will be 1GB and metadata 256MB. They will > however be smaller if there isn't enough space left for a full chunk, > and will get larger as well once you get past a certain filesystem size > (I don't remember the exact size, but I've seen people talking about big > (double digit TB sized) filesystems with 5GB+ sized data chunks). Yes. The wiki is correct about the _nominal_ size, but it doesn't say "nominal", making the overall claim invalid. If I had a wiki account I'd probably change it right now, but for personal reasons I don't fully understand myself, I seem to treat web pages, including wikis I could in theory edit, as read-only, even if the alternative is replying repeatedly to list threads such as this, vs. a single wiki edit. [shrug] -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman