>The idea behind the cloneset is that most of the blocks (or files)
>do not change in either source or target.  This being the case its only 
necessary
>to update the changed elements.  This means updates are incremental. Once
>the system has figured out what it needs to update its usable and if you 
access
>an element that should be updated you will see the correctly updated 
version - even 
>though backgound resyncing is still in progress.

I still can't tell what you're describing.  With RAID1 as well, only 
changed elements ever get updated.  I have two identical filesystems, 
members of a RAIF set.  I change one file.  One file in each member 
filesystem gets updated, and I again have two identical filesystems.

How would a cloneset work differently, and how would it be better?

>This type of logic is great for backups.

Can you give an example of using it for backup?

--
Bryan Henderson                     IBM Almaden Research Center
San Jose CA                         Filesystems



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