From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-f43.google.com ([209.85.215.43]:35318 "EHLO mail-lf0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751256AbcFDVSv (ORCPT ); Sat, 4 Jun 2016 17:18:51 -0400 Received: by mail-lf0-f43.google.com with SMTP id w16so73698201lfd.2 for ; Sat, 04 Jun 2016 14:18:45 -0700 (PDT) Subject: Re: btrfs To: Chris Murphy References: <1464819934.6742.71.camel@scientia.net> <1464975482.6679.11.camel@scientia.net> <6f18c0d1-8ac5-c325-0ba8-ffb949c54554@gmail.com> <1465005092.6648.39.camel@scientia.net> <57528238.6080809@gmail.com> Cc: Christoph Anton Mitterer , Austin S Hemmelgarn , Btrfs BTRFS From: Andrei Borzenkov Message-ID: <575345B1.8070103@gmail.com> Date: Sun, 5 Jun 2016 00:18:41 +0300 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: 04.06.2016 20:00, Chris Murphy пишет: > On Sat, Jun 4, 2016 at 1:24 AM, Andrei Borzenkov wrote: >> 04.06.2016 04:51, Christoph Anton Mitterer пишет: >> ... >>> >>>> The only extant systems that support higher >>>> levels of replication and call it RAID-1 are entirely based on MD >>>> RAID >>>> and it's poor choice of naming. >>> >>> Not true either, show me any single hardware RAID controller that does >>> RAID1 in a dup2 fashion... I manage some >2PiB of storage at the >>> faculty, all controller we have, handle RAID1 in the sense of "all >>> disks mirrored". >>> >> >> Out of curiosity - which model of hardware controllers? Those I am aware >> of simply won't let you create RAID1 if more than 2 disks are selected. > > SNIA's DDF 2.0 spec Rev 19 > page 18/19 shows 'RAID-1 Simple Mirroring" vs "RAID-1 Multi-Mirroring" > The question was about hardware that implements it.