[linux-lvm] Limitation: only < 32 snapshots possible
daniel.schwager at dtnet.de
Sat Apr 14 13:27:03 UTC 2007
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
"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
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
Thanks for helping
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
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