[linux-lvm] multiple lvm2-snapshots on the same origin -> device-mapper error

[Patrick Reinhardt <patrick-reinhardt web de>]

Hi!
I'm running in trouble creating more than 16 snapshots of the same origin:

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# /sbin/lvcreate  -s -L150M -n rootfs_node17 /dev/vg/ro_rootfs
File descriptor 5 left open
File descriptor 6 left open
  Rounding up size to full physical extent 152.00 MB
  device-mapper ioctl cmd 9 failed: Cannot allocate memory
  Couldn't load device 'vg-rootfs_node8'.
  Problem reactivating origin ro_rootfs

# lvm version
  LVM version:     2.01.04 (2005-02-09)
  Library version: 1.01.00-ioctl (2005-01-17)
  Driver version:  4.4.0

# uname -a
  Linux hostname 2.6.11.12-xen0 #1 Thu Aug 4 00:45:12 BST 2005 i686
GNU/Linux

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Browsing the mailing list archives I didn't find a suitable solution
although the problem was mentioned before, e.g. on
http://lists.xensource.com/archives/html/xen-devel/2004-09/msg00426.html

Any ideas?

Thank you in advance.

Patrick Reinhardt