From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailgw-02.dd24.net ([193.46.215.43]:53187 "EHLO mailgw-02.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932207AbcFCRiJ (ORCPT ); Fri, 3 Jun 2016 13:38:09 -0400 Received: from mailpolicy-01.live.igb.homer.key-systems.net (mailpolicy-01.live.igb.homer.key-systems.net [192.168.1.26]) by mailgw-02.dd24.net (Postfix) with ESMTP id E414D5FCCF for ; Fri, 3 Jun 2016 17:38:05 +0000 (UTC) Received: from mailgw-02.dd24.net ([192.168.1.36]) by mailpolicy-01.live.igb.homer.key-systems.net (mailpolicy-01.live.igb.homer.key-systems.net [192.168.1.25]) (amavisd-new, port 10236) with ESMTP id pEyOwpPumNGH for ; Fri, 3 Jun 2016 17:38:03 +0000 (UTC) Received: from heisenberg.fritz.box (ppp-46-244-203-153.dynamic.mnet-online.de [46.244.203.153]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mailgw-02.dd24.net (Postfix) with ESMTPSA for ; Fri, 3 Jun 2016 17:38:03 +0000 (UTC) Message-ID: <1464975482.6679.11.camel@scientia.net> Subject: Re: btrfs (was: raid5/6) production use status (and future)? From: Christoph Anton Mitterer To: linux-btrfs@vger.kernel.org Date: Fri, 03 Jun 2016 19:38:02 +0200 In-Reply-To: References: <1464819934.6742.71.camel@scientia.net> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-qRMS8ufP0WO7+cHlmA36" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: --=-qRMS8ufP0WO7+cHlmA36 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hey.. Hm... so the overall btrfs state seems to be still pretty worrying, doesn't it? - RAID5/6 seems far from being stable or even usable,... not to talk =C2=A0 about higher parity levels, whose earlier posted patches (e.g. =C2=A0=C2=A0http://thread.gmane.org/gmane.linux.kernel/1654735) seem to hav= e =C2=A0 been given up. - Serious show-stoppers and security deficiencies like the UUID =C2=A0 collision corruptions/attacks that have been extensively discussed =C2=A0 earlier, are still open - a number of important core features not fully working in many =C2=A0 situations (e.g. the issues with defrag, not being ref-link aware,..= . =C2=A0 an I vaguely remember similar things with compression). - OTOH, defrag seems to be viable for important use cases (VM images, =C2=A0 DBs,... everything where large files are internally re-written =C2=A0 randomly). =C2=A0 Sure there is nodatacow, but with that one effectively completely =C2=A0 looses one of the core features/promises of btrfs (integrity by =C2=A0 checksumming)... and as I've showed in an earlier large discussion, =C2=A0 none of the typical use cases for nodatacow has any high-level =C2=A0 checksumming, and even if, it's not used per default, or doesn't giv= e =C2=A0 the same benefits at it would on the fs level, like using it for RAI= D =C2=A0 recovery). - other earlier anticipated features like newer/better compression or =C2=A0 checksum algos seem to be dead either - still no real RAID 1 - no end-user/admin grade maangement/analysis tools, that tell non- =C2=A0 experts about the state/health of their fs, and whether things like =C2=A0 balance etc.pp. are necessary - the still problematic documentation situation --=-qRMS8ufP0WO7+cHlmA36 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCCEmow 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