On Mon Mar 25 00:37:51 EDT 2013, cinap_len...@gmx.de wrote: > i was thinking about this some time ago... theres the fakeworm > device "f<subdevice>" that will maintain a block bitmap of > the blocks that have already been written. one could write > a program that also backups the block bitmap and on backup, > compares the bitmaps prior copying blocks so only newly > written blocks get backed up.
the fakeworm device causes more trouble than it's worth. and there's no reason other than tradition to use it. if you simply drop the "f" from an existing configuration that uses it, you'll be free of the little nanny that will break things if you device size changes by a little, say from running from a backup, or you need to recover a botched dump. it's much simplier just to do a bit copy and know that the same configuration will run as long as the existing worm will fit. - erik
