On Tue, Sep 09, 2014 at 08:59:03PM -0500, Robert Nichols wrote: > On 09/09/2014 04:52 PM, Ross Boylan wrote: >> The FAQ advises wipeing it, though the >> only explicit reasons seem not much of a concern for space in a volume >> group (but later there are references to attacks available if the >> attacker can determine which sectors are unused). As far as I know >> there is no way to access the unused area of the volume group ... > > Easy. Create a new LV in that VG and use "--extents 100%FREE" as > its size. Fill that LV with whatever variety of random data you > choose, then delete that LV and use the space to expand your active > LV. Thanks; I wasn't aware of that syntax. But do the snapshots make that hazardous? If the maximum space I specified for them is pre-allocated it should be fine, but I thought the implementation grabbed blocks as needed. If that's the case, a snapshot could fail while I have grabbed all the "free" space. I suppose worst case I could do 90%Free and be good enough. Ross _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
