From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx12.extmail.prod.ext.phx2.redhat.com [10.5.110.17]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id p5FHQ9GL016268 for ; Wed, 15 Jun 2011 13:26:10 -0400 Received: from lxme02.infocamere.it (lxme02.infocamere.it [80.82.3.213]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p5FHQ8J1031086 for ; Wed, 15 Jun 2011 13:26:09 -0400 Received: from lxm07.intra.infocamere.it (lxm07.intra.infocamere.it [1.5.72.7]) by lxme02.infocamere.it (8.14.3/8.14.3) with ESMTP id p5FHQ7S5024879 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Wed, 15 Jun 2011 19:26:08 +0200 Received: from [1.5.28.70] (ic2301012.ic.intra.infocamere.it [1.5.28.70]) (authenticated bits=0) by lxm07.intra.infocamere.it (8.14.3/8.14.3) with ESMTP id p5FHQ7Zq011070 for ; Wed, 15 Jun 2011 19:26:07 +0200 Message-ID: <4DF8EB19.6030106@infocamere.it> Date: Wed, 15 Jun 2011 19:25:45 +0200 From: Enrico Ferro MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [linux-lvm] Meaning of LV -missing__ devices Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: linux-lvm@redhat.com Hi all, after the extention of a logical volume (mysqld1) a new "ghost" logical volume appeared with a suffix: brw-rw---- 1 root disk 253, 38 Feb 15 20:53 vgmysql-mysqld1 brw-rw---- 1 root disk 253, 44 Jun 1 10:21 vgmysql-mysqld1-missing_4_0 Before performing this LV we partitioned and added a new LUN to the existing vgmysql volume group (again, no errors reported). We did not discovered this strange device immediately (the lvextend command did not reported errors), only after resizing the file system. The ext2fs operation aborted and so we started with investigation. Commands like vgdisplay reported errors like: # vgdisplay -s /dev/mapper/vgmysql-mysqld1-missing_4_0: read failed after 0 of 4096 at 0: Input/output error "vg00" 132.59 GB [28.78 GB used / 103.81 GB free] "vgmysql" 811.95 GB [793.00 GB used / 18.95 GB free] So online resize of the FS failed, we unmounted the LV, extended with (apparent) success the filesystems and lived happy for a few days. Only while a deep corruption of the FS appeared. :-( A reboot cleaned up the strange "missing" LV, it is no more present. The point is: what is the meaning of -missing_* device? When are they generated (and why there are no warnings reported?) thank your for your suggestions, best regards, -- Enrico