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Re: [linux-lvm] Error creating snapshot, "Cannot allocate memory"

On Mon, Dec 02, 2002 at 02:32:23PM -0800, jheiss-linuxlvm ofb net wrote:
> I have a volume group that is 1.4 TB, with a volume that is 400 GB.
> I currently have three 50 GB snapshots of that volume.  When I try
> to create a fourth, I get the following error:
> bash-2.05a# lvcreate -L 50G -s -n snap_home1_20021202 /dev/home/home1
> lvcreate -- WARNING: the snapshot will be automatically disabled once it
> gets full
> lvcreate -- INFO: using default snapshot chunk size of 64 KB for
> "/dev/home/snap_home1_20021202"
> lvcreate -- ERROR "Cannot allocate memory" creating VGDA for
> "/dev/home/snap_home1_20021202" in kernel

You don't have enough kernel virtual memory to hold the snapshot exception
table in core :(
Install more RAM.

We have planned to reduce the amount of RAM needed to hold such tables
in LVM2/device-mapper next year.

> After some experimenting, I found that I could create a snapshot that
> is 36 GB or smaller, but anything larger than 36 GB fails with the above
> error.  The volume group has 386 GB free.
> Any thoughts?  I looked through the changelog and mailing list archives
> and couldn't find anything similar.
> Other possibly useful bits of info:
> OS:  Red Hat 7.3
> kernel:  2.4.18-18.7.xsmp
> LVM:  1.0.3-4  (Red Hat RPM)
> Jason
> _______________________________________________
> 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/


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
Mauelshagen Sistina com                           +49 2626 141200
                                                       FAX 924446

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