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Use fallocate where available to allocate file system blocks efficiently when the VM is initially provisioned. This will give immediate feedback if enough space isn't available. Also it may significantly improve performance on writes to new blocks, and may even improve I/O performance to prewritten blocks due to reduced fragmentation. Also noted is the potential to subsume the less general libvirt_sparse_logical_volumes option into the new more general preallocate_images option. Implements bp: preallocated-images Change-Id: I4bbb8616416c9dca3a3a8894ebf764a0b6b8dbc9
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Pádraig Brady
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Feb 20, 2013
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