[Bug 590929] Re: eucalyptus create and delete volumes sometimes fail on lvm commands (POC + ENT configs)

[C de-Avillez]

There are some points that should be kept in mind:

* this error is (quite possibly) a result of a race; the tests we usually conduct are stress tests -- in this case, we try to allocate a few hundreds of volumes in one single sweep -- we are requesting volume creation faster than volumes can be created, so we are more prone to the race condition(s).
* files are allocated in *sparse* mode -- so a newly-created 1Gbytes file will actually use just a few tens of Kbytes. This means it is much more difficult to run out of space (by at least two orders of magnitude).
* if the loop device is not unallocated, then there is a (perhaps higher) chance of running out of loop devices -- we have the system preset to allocate 512 such devices --. But, still, there is an easy bypass: just create more loop devices.

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eucalyptus create and delete volumes sometimes fail on lvm commands (POC + ENT configs)
https://bugs.launchpad.net/bugs/590929
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