>On Sun, 2006-07-16 at 15:21, Darren J Moffat wrote:
>> Jeff Victor wrote:
>> > Why?  Is the 'data is encrypted' flag only stored in filesystem 
>> > metadata, or is that flag stored in each data block?  
>> 
>> Like compression and which checksum algorithm it will be stored in
>> every dmu object.
>
>I thought the compression alg was stored in the block pointer.  IMHO you
>need at least a few bits of key version number in the block pointer to
>do graceful key roll-over (you don't need an alg id in the bp since that
>can be stored with the key..)

So how many of the 128 bits of the blockpointer are used for things
other than to point where the block is?

Casper
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