From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Lavin Subject: Resetting dmsetup open count Date: Wed, 02 Jul 2008 16:39:25 +0100 Message-ID: <486BA12D.5010506@cs.tcd.ie> Reply-To: lavinp@cs.tcd.ie, device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: dm-devel@redhat.com List-Id: dm-devel.ids Dear dmsetup mailers, I am attempting to remove a LVM in CentOS 5. I am getting the following message... Can't remove open logical volume "lvm_name" I can delete the link... /dev/vg01/lvm_name and also delete the associated block... /dev/mapper/vg01-lvm_name. However, when I attempt to recreate the LVM using the same name (I need to use the same name). I get a message that the LVM already exists. I have traced this to dmsetup, where running dmsetup info vg01-lvm_name reveals... [root@tg26 mapper]# dmsetup info vg01-lvm_name Name: vg01-lvm_name State: ACTIVE Tables present: LIVE Open count: 1 <------- this appears to be the problem Event number: 0 Major, minor: 253, 63 Number of targets: 1 UUID: LVM-CT2Hz7dN6TLC3c8DydQ8nIenwjSmA8CI1yrsTLQy7Ip1Cxetz3 JrdQArvsgBqDsj I may be able to reset this Open count by rebooting the machine but this is the least preferred option. Is there a was of resetting this 'Open count' in the dmsetup records without rebooting the system. My dmsetup version is pre- 4.8.0 so I cannot use the lvmremove -f option. Peter -- best regards, Peter Lavin, Computer Architecture & Grid Research Group, Lloyd Institute, 005, Trinity College Dublin, Ireland. +353 1 8961536