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[linux-lvm] Limitation: only < 32 snapshots possible



Hi together,

i create 5 LV's (e.g. play1..n) and therefore, i created 10 snapshots
for each LV. After 32 snapshots (should 5*10 = 50 snapshots), i got the
following error:
   "device-mapper: reload ioctl failed: Cannot allocate memory"

My versions (on debian etch):
   xentor:/etc/lvm# lvm version
     LVM version:     2.02.07 (2006-07-17)
     Library version: 1.02.08 (2006-07-17)
     Driver version:  4.7.0

I looked arround and found http://sources.redhat.com/lvm2/wiki/FrequentlyAskedQuestions (last topic on page):

   *  > Known problem - will be partially solved by new DM-IO interface.
   *  > But anyway, current snapshot implementation is not properly
     designed for such type of operation (many snapshots will
     significantly slow down all IO).

QUESTION: Is this limitiation fixed in the current version 2.02.24 from ftp://sources.redhat.com/pub/lvm2

Thanks for helping

regards

Danny

BTW: I want to clone (means create LVMs-snapshot) about 40 xen vm's running on 4 xen-server .. therefore it would nice to use the LVM2-snapshot-feature (instead of GFS/OCFS2).




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