If you've got the capacity to test, create one that's quite a bit larger and see how much space it actually uses up when full, then use that size in future. There's a header, and then the blocks are written sequentially with an index block inserted ahead of each group of data blocks. Or try out thin LVs available in recent LVM releases/kernels for an alternative 'sparse' approach. Alasdair _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/