Re: HAMMER update 06-Feb-2008

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Matthew Dillon wrote:
>     [vol_no:8][sanity:1][offset:55]	(sanity bit is always 1 to catch
> 					 programming errors).
>
>     That allows 32768 TB per volume.  I will probably steal a few more bits
>     to abstract out a blockmap layer, but I can't imagine needing more then
>     another 7 bits, giving us 256 TB per volume (x 256 volumes == 65536 TB).

What is a volume?  Like a disk?  I think we should shoot for considerably 
more than 256TB per disk.  Looking at the current growth, that's about 10 
years from now.  And keep in mind that DragonFly already exists over 4 
years, so time is running fast.

Sounds scary, but I think we should really consider if wasting bits is 
worth it.

cheers
  simon

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