From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.rus.uni-stuttgart.de ([129.69.192.2]:48929 "EHLO mx2.rus.uni-stuttgart.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751967AbbHLNRq (ORCPT ); Wed, 12 Aug 2015 09:17:46 -0400 Received: from localhost (localhost [127.0.0.1]) by mx2.rus.uni-stuttgart.de (Postfix) with ESMTP id 0F089200CC for ; Wed, 12 Aug 2015 15:08:01 +0200 (CEST) Received: from mx2.rus.uni-stuttgart.de ([127.0.0.1]) by localhost (mx2.rus.uni-stuttgart.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Cq2bggvFNqcf for ; Wed, 12 Aug 2015 15:07:59 +0200 (CEST) Received: from diaspora.rus.uni-stuttgart.de (diaspora.rus.uni-stuttgart.de [129.69.13.139]) by mx2.rus.uni-stuttgart.de (Postfix) with SMTP for ; Wed, 12 Aug 2015 15:07:59 +0200 (CEST) Date: Wed, 12 Aug 2015 15:07:58 +0200 From: Ulli Horlacher To: linux-btrfs@vger.kernel.org Subject: RAID0 wrong (raw) device? Message-ID: <20150812130758.GA26529@rus.uni-stuttgart.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-btrfs-owner@vger.kernel.org List-ID: I have 2 identical servers with 2 x 2 Hitachi (HGST) SATA disks (and some other disks) which are mirrored with drbd. On top of this drbd setup I have created a btrfs RAID0 filesystem. The problem now is, that btrfs shows the raw device instead of the drbd device. root@toy02:~# mkfs.btrfs /dev/drbd2 /dev/drbd3 root@toy02:~# mount btrfs filesystem label /dev/drbd2 data root@toy02:~# mount /dev/drbd2 /data root@toy02:~# df -T /data Filesystem Type 1K-blocks Used Available Use% Mounted on /dev/sdb btrfs 3906909856 140031696 3765056176 4% /data root@toy02:~# btrfs filesystem show /data Label: data uuid: 411af13f-6cae-4f03-99dc-5941acb3135b Total devices 2 FS bytes used 129.81GiB devid 3 size 1.82TiB used 67.03GiB path /dev/drbd2 devid 4 size 1.82TiB used 67.03GiB path /dev/sdb Btrfs v3.12 ==> btrfs shows the wrong (raw) device /dev/sdb instead of /dev/drbd3 ! root@toy02:~# uname -a; lsb_release -a Linux toy02 3.13.0-61-generic #100-Ubuntu SMP Wed Jul 29 11:21:34 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.3 LTS Release: 14.04 Codename: trusty root@toy02:~# find /dev -ls | grep drbd 47453 0 brw-rw---- 1 root disk Aug 12 14:51 /dev/drbd3 47433 0 brw-rw---- 1 root disk Aug 11 14:00 /dev/drbd2 14706 0 drwxr-xr-x 4 root root 80 Aug 10 14:17 /dev/drbd 14713 0 drwxr-xr-x 2 root root 100 Aug 12 13:40 /dev/drbd/by-res 41685 0 lrwxrwxrwx 1 root root 11 Aug 12 14:51 /dev/drbd/by-res/d3 -> ../../drbd3 42759 0 lrwxrwxrwx 1 root root 11 Aug 11 14:00 /dev/drbd/by-res/d2 -> ../../drbd2 14707 0 drwxr-xr-x 3 root root 60 Aug 10 14:17 /dev/drbd/by-disk 14708 0 drwxr-xr-x 3 root root 60 Aug 10 14:17 /dev/drbd/by-disk/disk 14709 0 drwxr-xr-x 2 root root 100 Aug 12 13:40 /dev/drbd/by-disk/disk/by-id 41682 0 lrwxrwxrwx 1 root root 17 Aug 12 14:51 /dev/drbd/by-disk/disk/by-id/ata-HGST_HUS724020ALA640_PN2134P5G2P2AX -> ../../../../drbd3 42756 0 lrwxrwxrwx 1 root root 17 Aug 11 14:00 /dev/drbd/by-disk/disk/by-id/ata-HGST_HUS724020ALA640_PN2134P5G2P2XX -> ../../../../drbd2 41681 0 lrwxrwxrwx 1 root root 8 Aug 12 14:51 /dev/block/147:3 -> ../drbd3 42755 0 lrwxrwxrwx 1 root root 8 Aug 11 14:00 /dev/block/147:2 -> ../drbd2 root@toy02:~# find /dev -ls | grep HGST 41682 0 lrwxrwxrwx 1 root root 17 Aug 12 14:51 /dev/drbd/by-disk/disk/by-id/ata-HGST_HUS724020ALA640_PN2134P5G2P2AX -> ../../../../drbd3 42756 0 lrwxrwxrwx 1 root root 17 Aug 11 14:00 /dev/drbd/by-disk/disk/by-id/ata-HGST_HUS724020ALA640_PN2134P5G2P2XX -> ../../../../drbd2 63889 0 lrwxrwxrwx 1 root root 9 Aug 12 13:42 /dev/disk/by-id/ata-HGST_HUS724020ALA640_PN2134P5G2P2AX -> ../../sdb 7429 0 lrwxrwxrwx 1 root root 9 Aug 10 16:45 /dev/disk/by-id/ata-HGST_HUS724020ALA640_PN2134P5G2P2XX -> ../../sdd root@toy02:~# hdparm -I /dev/sdb| grep Number: Model Number: HGST HUS724020ALA640 Serial Number: PN2134P5G2P2AX root@toy02:~# hdparm -I /dev/sdd| grep Number: Model Number: HGST HUS724020ALA640 Serial Number: PN2134P5G2P2XX root@toy02:~# hdparm -I /dev/sde| grep Number: Model Number: HGST HUS724020ALA640 Serial Number: PN2134P5G2P2AX /dev/sdb and /dev/sde have the same serial number! But there are really only 2 HGST drives in the server (and some other seagate disks, non-relevant here). root@toy02:~# find /dev -ls | grep sde 10391 0 brw-rw---- 1 root disk Aug 10 16:45 /dev/sde 8360 0 lrwxrwxrwx 1 root root 9 Aug 10 16:45 /dev/disk/by-path/pci-0000:08:00.0-scsi-0:1:2:0 -> ../../sde 8355 0 lrwxrwxrwx 1 root root 6 Aug 10 16:45 /dev/block/8:64 -> ../sde root@toy02:~# find /dev -ls | grep sdb 10382 0 brw-rw---- 1 root disk Aug 12 13:42 /dev/sdb 68794 0 lrwxrwxrwx 1 root root 9 Aug 12 13:42 /dev/disk/by-uuid/411af13f-6cae-4f03-99dc-5941acb3135b -> ../../sdb 12410 0 lrwxrwxrwx 1 root root 9 Aug 12 13:42 /dev/disk/by-path/pci-0000:08:00.0-sas-0x1221000002000000-lun-0 -> ../../sdb 68791 0 lrwxrwxrwx 1 root root 9 Aug 12 13:42 /dev/disk/by-label/data -> ../../sdb 63890 0 lrwxrwxrwx 1 root root 9 Aug 12 13:42 /dev/disk/by-id/wwn-0x5000cca24ec137db -> ../../sdb 63889 0 lrwxrwxrwx 1 root root 9 Aug 12 13:42 /dev/disk/by-id/ata-HGST_HUS724020ALA640_PN2134P5G2P2AX -> ../../sdb 12403 0 lrwxrwxrwx 1 root root 6 Aug 12 13:42 /dev/block/8:16 -> ../sdb /dev/sdb and /dev/sde are in reality the same physical disk! -- Ullrich Horlacher Informationssysteme und Serverbetrieb IZUS/TIK E-Mail: horlacher@rus.uni-stuttgart.de Universitaet Stuttgart Tel: ++49-711-68565868 Allmandring 30a Fax: ++49-711-682357 70550 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/ REF:<20150812130758.GA26529@rus.uni-stuttgart.de>