Philip Brown writes:
 > Roch wrote:
 > > And, if    the load can accomodate   a
 > > reorder, to  get top per-spindle read-streaming performance,
 > > a cp(1) of the file should do wonders on the layout.
 > > 
 > 
 > but there may not be filesystem space for double the data.
 > Sounds like there is a need for a zfs-defragement-file utility perhaps?
 > 
 > Or if you want to be politically cagey about naming choice, perhaps,
 > 
 > zfs-seq-read-optimize-file ?  :-)
 > 

Possibly or may using fcntl ?

Now the goal is to take a file with scattered blocks and order
them in contiguous chunks. So this is contigent on the
existence of regions of free contiguous disk space. This
will get more difficult as we get close to full on the
storage.

-r




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