is "pvdisplay -m" still unimplemented? After I turned to a hardware raid5 system my PVs become quite HUGE (about 2-4 TB each!). This huge PVs easily get fragmented. If I want to pvmove some LV it often does not work by default. The huge PV has space to hold the additional LV, but it is not contiguous, and "--alloc anywhere" won't split a contiguous chunk to fit into smaller gaps. (and the algorithm to do so is not trivial, even if it sounds easy). So I frequently end up with a desk calculator to analyze my /etc/lvm/backup/ metadata to extract a list of occupied and free ranges on my PV to express pvmove commands with explicit PE ranges. To make this easier, I would propose the following extensions: Some command/option to print out the layout of a PV including the free gaps. Extend the --units option to display LE counts. (one could use "e", but I don't know, how long it takes until we need to express sizes as exabytes :-) Express LE ranges by a "+" like /dev/sda:1000+500 as a shortcut for /dev/sda:1000-1499. btw: is there a more detailed description about how pvmove exactly behaves when giving multiple source and/or target ranges? --> can I explicitly express the splitting of source chunks into target fragments by a single pvmove command? If someone agrees that this is useful, I may start trying to implement this and propose some patches. Dieter. _______________________________________________ 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/
