Heinz, So to make a snapshot of the 1.4T LV which currently has a 400G of space being used by data I need to run the lvcreate command like this: lvcreate -L1000M -s -n snap00 /dev/Volume00/LogVol00 I guess I thought the -L needed to be the same size as the current logical volume? Thanks, David -----Original Message----- From: Heinz J . Mauelshagen [mailto:mauelshagen@sistina.com] Sent: Fri 6/20/2003 4:09 AM To: linux-lvm@sistina.com Cc: Subject: Re: [linux-lvm] Snapshot Problem JFS On Thu, Jun 19, 2003 at 09:07:30PM -0500, David Sornig wrote: > I am running RedHat 9.0 > Kernel 2.4.20-8 > LVM Version 1.0.5+(22/07/2002) > > I have a 1.4T LogVol with 400G of space being used on a JFS file system. > > The LVM is working excellent. However, I cannot create a snapshot. I run the following lvcreate command as per the man page and get the following error: > > lvcreate --error "Cannot allocate memory" creating VGDA for "/dev/Volume00/snap01" in kernel > David, memory allocated to the snapshot needs free physical RAM. With 400GB and default snapshot extent size we're talking about ~1GB (using virtual memory for snapshot exception tables so that the table doesn't need to be in RAM completely any longer is a work item for LVM2). Do you really expect that much change to your 1.4TB LV during the lifetime of the snapshot ? If you use it for a backup, you might get along with a couple of GB allocated to the snapshot reducing exception table size drastically. > Not sure why this is happening. I have read the list and maybe I just don't understand the problem. These servers have 4 Gigs of RAM. > > Regards, > > David -- Regards, Heinz -- The LVM Guy -- *** Software bugs are stupid. Nevertheless it needs not so stupid people to solve them *** =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Sistina Software Inc. Senior Consultant/Developer Am Sonnenhang 11 56242 Marienrachdorf Germany Mauelshagen@Sistina.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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