faubackup TODO,1.3,1.4

Update of /cvsroot/faubackup/faubackup
In directory sc8-pr-cvs1:/tmp/cvs-serv10955

Modified Files:
	TODO 
Log Message:
update


Index: TODO
===================================================================
RCS file: /cvsroot/faubackup/faubackup/TODO,v
retrieving revision 1.3
retrieving revision 1.4
diff -C2 -d -r1.3 -r1.4
*** TODO	26 Feb 2003 19:00:14 -0000	1.3
--- TODO	15 Oct 2003 12:08:36 -0000	1.4
***************
*** 21,25 ****
  faubackup-find
  			 -->
! 				faubackup-???
  			<--
  faubackup-gather
--- 21,25 ----
  faubackup-find
  			 -->
! 				faubackup-gethash
  			<--
  faubackup-gather
***************
*** 34,36 ****
--- 34,73 ----
  have to call different programs, can't use ssh-authorized_keys-commands
  	just call fauback --remote or something and read standard-input for command?
+ 
+ 
+ 
+ 
+ 
+ Hash functions
+ --------------
+ 
+ for each inode, store its md5sum/sha1/whatever
+ faubackup-gethash returns that hash
+ faubackup-gather first calculates the hash of every file that is to be backed
+ if it's identical, it sends a 'no-update' command to faubackup-scatter
+ 
+ before: one read on source-disk, one read and one write on target disk
+ after: one or two reads on source-disk, zero or one write on target disk
+ 	(depending on weather we need the update or not)
+ 
+ 
+ use the hash instead of the inode number to identify content?
+ this would save some space.
+ yes, but it wouldn't be a correct backup any more
+ i.e. the backup would link identical files that are not hard-linked
+ in the original. this may introduce problems.
+ 
+ so, we still need the inode number, hash can only be used to speed up the backup
+ 
+ 
+ 
+ 
+ use rsync?
+ ----------
+ 
+ this would be even better than the hash over the complete file, as 
+ we'd only have to transfer the changed part of the file
+ 
+ could work with --compare-dest and --link-dest if we use the inode link
+ as destination, and manuall link it to the real name later
  




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