From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f42.google.com ([209.85.192.42]:42871 "EHLO mail-qg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751448AbaLSVxz (ORCPT ); Fri, 19 Dec 2014 16:53:55 -0500 Received: by mail-qg0-f42.google.com with SMTP id q108so1293768qgd.1 for ; Fri, 19 Dec 2014 13:53:54 -0800 (PST) Message-ID: <54949E60.7010201@ubuntu.com> Date: Fri, 19 Dec 2014 16:53:36 -0500 From: Phillip Susi MIME-Version: 1.0 To: Josef Bacik , Daniele Testa CC: linux-btrfs@vger.kernel.org Subject: Re: btrfs is using 25% more disk than it should References: <54947432.5010107@ubuntu.com> <5494955C.3020603@fb.com> In-Reply-To: <5494955C.3020603@fb.com> Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 12/19/2014 4:15 PM, Josef Bacik wrote: > Please God don't turn off of checksums. Checksums are tracked in > metadata anyway, they won't show up in the data accounting. Our > csums are 8 bytes per block, so basic math says you are going to > max out at 604 megabytes for that big of a file. Yes, and it is exactly that metadata space he is complaining about. So if you don't want to use up all of that space ( and have no use for the checksums ), then you turn them off. > Please people try to only take advice from people who know what > they are talking about. So unless it's from somebody who has > commits in btrfs/btrfs-progs take their feedback with a grain of > salt. Thanks, Well that is rather arrogant and rude. For that matter, I *do* have commits in btrfs-progs. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) iQEcBAEBAgAGBQJUlJ5gAAoJENRVrw2cjl5RZ5MIAI0Ok0q0hFTMcYYXu1U48R4Z AsuRg6zQDMOa9C1SqZucH2cuiiaGU8XixKcscaquoJDzzaND2kuy+sxp0k2YQnGz +/269OmZUtwjYil1NcSFTJiE2bYUAx1R+xWUGax/03NsXRr672f0EtAQ2sIitTaG WsNUhiU0GREpQL6pK403fO79eD2vRmgCx2w50gB2OYPQYciJ+YN0YAJ7z8VEmUro M9xqce2oc7haAHliDvazl+7IDRkkiZ7FcpSs2nBSqiHiUhgVaxuTzHZEXvUasE5l LamJCwiSwuevWWPCDE4N/r7qVcamKM2K/DMvZCiOuPkSm3YkcVyrUd8x4i8OEJs= =8R13 -----END PGP SIGNATURE-----