From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.11.6/8.11.6) with ESMTP id k27LDg130783 for ; Tue, 7 Mar 2006 16:13:42 -0500 Received: from mta4.srv.hcvlny.cv.net (mta4.srv.hcvlny.cv.net [167.206.4.199]) by mx3.redhat.com (8.13.1/8.13.1) with ESMTP id k27LDaKk010678 for ; Tue, 7 Mar 2006 16:13:36 -0500 Received: from [127.0.0.1] (ool-182e627d.dyn.optonline.net [24.46.98.125]) by mta4.srv.hcvlny.cv.net (Sun Java System Messaging Server 6.2-4.03 (built Sep 22 2005)) with ESMTP id <0IVS00GAD0AEAHZ3@mta4.srv.hcvlny.cv.net> for linux-lvm@redhat.com; Tue, 07 Mar 2006 16:13:27 -0500 (EST) Date: Tue, 07 Mar 2006 16:13:21 -0500 From: Brian Weck Message-id: <440DF771.1050506@weck.net> MIME-version: 1.0 Content-transfer-encoding: 7BIT Subject: [linux-lvm] snapshot, machine hang and physical memory required 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 I seem to be encountering a problem when attempting to create a snapshot. Sometimes the snapshot goes through fine and at other times while executing a 'lvcreate --snapshot ...' it subsequently causes my box to hang completely. From what I've read, this problem seems to be related to having insufficient physical memory. I can not seem to find where/how to estimate how much memory is required to successfully perform the snapshot. Is the memory required relative to the snapshot size, the size of the target LVM device or both? I'm running with a 2.6.12 kernel: lvm2-2.01.14-2.0.RHEL4 device-mapper-1.01.04-1.0.RHEL4 As the machine seems to hang when creating a snapshot on "/" (rather the logical volume upon which "/" resides), upon a reboot I do not see anything in my logs related to the problem which further makes the problem harder to debug. Any help would be greatly appreciated- Brian