Krzys wrote:
> WHen property value copies is set to value greater than 1 how does it work? 
> Will 
> it store second copy of data on different disk? or does it store it on the 
> same 
> disk? 

This is hard to describe in words, so I put together some pictures.
http://blogs.sun.com/relling/entry/zfs_copies_and_data_protection

> Also when this setting is changed at some point on file system, will it 
> make copies of existing data or just new data thats being written from now on?
>   

Changes to such parameters (copies, compression) affect new
writes.  Previously written data will remain as-is.  A new file
which is a copy of an old file will be written with the new
policy.
 -- richard

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