From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f46.google.com ([209.85.214.46]:36906 "EHLO mail-it0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751574AbcIML0h (ORCPT ); Tue, 13 Sep 2016 07:26:37 -0400 Received: by mail-it0-f46.google.com with SMTP id 186so36590393itf.0 for ; Tue, 13 Sep 2016 04:26:37 -0700 (PDT) Subject: Re: Is stability a joke? (wiki updated) To: Timofey Titovets , Waxhead References: <57D51BF9.2010907@online.no> <20160912142714.GE16983@twin.jikos.cz> <20160912162747.GF16983@twin.jikos.cz> <6762481.5JxuKd9axT@merkaba> <20160912202109.GL28465@reaktio.net> <57D714A2.5040904@online.no> Cc: =?UTF-8?B?UGFzaSBLw6Rya2vDpGluZW4=?= , Martin Steigerwald , dsterba@suse.cz, linux-btrfs From: "Austin S. Hemmelgarn" Message-ID: <643114c9-af90-622f-811f-817cc1d9db27@gmail.com> Date: Tue, 13 Sep 2016 07:26:32 -0400 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 2016-09-13 04:38, Timofey Titovets wrote: > https://btrfs.wiki.kernel.org/index.php/Status > I suggest to mark RAID1/10 as 'mostly ok' > as on btrfs RAID1/10 is safe to data, but not for application that uses it. > i.e. it not hide I/O error even if it's can be masked. > https://www.spinics.net/lists/linux-btrfs/msg56739.html > > /* Retest it with upstream 4.7.2 - not fixed */ This doesn't match with what my own testing indicates at least for raid1 mode. I run similar tests myself every time a new stable kernel version comes out (but only on the most recent stable version) once I get my own patches re-based onto it, and I haven't seen issues like this in any of the 4.7 kernels, and don't recall any issues like this in any of the 4.6 kernels. In fact, I've actually dealt with systems with failing disks using BTRFS raid1 mode, including one at work just yesterday where the SATA cable had worked loose from vibrations and was causing significant data corruption. It survived just fine, as have all the other systems I've dealt with which had hardware issues while running BTRFS in raid1 mode. The indicated behavior would be consistent with issues seen sometimes when using compression however, but the OP in the linked message made no indication of there being any in-line compression involved.