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revision 1.204 by tjl, Sat Feb 15 19:01:10 2003 UTC revision 1.205 by tjl, Sat Feb 15 19:05:34 2003 UTC
# Line 485  Storm block storage Line 485  Storm block storage
485  ===================  ===================
486    
487  In Storm, all data is stored  In Storm, all data is stored
488  as *blocks*, byte sequences identified by a SHA-1  as *blocks*, immutable byte sequences identified by a SHA-1
489  cryptographic content hash [fips-sha-1]_.  cryptographic content hash [fips-sha-1]_.
490  Purely a function of a block's content, block ids  Purely a function of a block's content, block ids
491  are completely independent of network location.  are completely independent of network location.
492  Blocks have a similar granularity  Blocks have a similar or somewhat finer granularity
493  as regular files, but they are immutable, since any change to the  as regular files, but they are immutable, since any change to the
494  byte sequence would change the hash (and thus create a different block).  byte sequence would change the hash (and thus create a different block).
495  Mutable data structures are built on top of the immutable blocks  Mutable data structures are built on top of the immutable blocks
# Line 521  This resembles e.g. the Squirrel Line 521  This resembles e.g. the Squirrel
521  web cache [iyer02squirrel]_; however, downloads can be  web cache [iyer02squirrel]_; however, downloads can be
522  from *any* peer since the source does not need to be trusted.  from *any* peer since the source does not need to be trusted.
523  On the other hand, there are privacy  On the other hand, there are privacy
524  concerns with exposing one's browser cache to the outside world.  concerns with exposing one's cache to the outside world.
525    
526  To replicate all data from computer A  To replicate all data from computer A
527  on computer B, it suffices to copy all blocks from A to B that B  on computer B, it suffices to copy all blocks from A to B that B
# Line 531  can coexist on the same system without n Line 531  can coexist on the same system without n
531  each version will be stored in its own block with its own id.  each version will be stored in its own block with its own id.
532  In contrast, a system based on mutable resources  In contrast, a system based on mutable resources
533  has to use more advanced schemes, for example merging the changes  has to use more advanced schemes, for example merging the changes
534  done to a document at A or B. (Merging is still be necessary  done to a document at A or B. (Merging is still necessary
535  when a user wants to incorporate a set of changes, but not  when a user wants to incorporate a set of changes, but not
536  required at replication time.)  required at replication time.)
537    

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