Re: btrfs seed question

[Anand Jain <anand.jain@oracle.com>]

>>> Not quite.  While the seed device is still connected I would like to
>>> force some files over to the rw device.  The use case is basically a
>>> much slower link to a seed device holding significantly more data than
>>> we currently need.  An example would be a slower iscsi link to the seed
>>> device and a local rw ssd.  I would like fast access to a certain subset
>>> of files, likely larger than the memory cache will accommodate. >>> If at a later time I want to discard the image as a whole I could
 >>> unmount the file system or


   Interesting. If you had not brought the idea of using seed device,
   I would have still thinking about bcache device as a solution for
   the above use case.

   However bcache device won't help to solve the further use case
   requirements as below..


>>> if I want a full local copy I could delete the
>>> seed-device to sync the fs.  In the mean time I would have access to
>>> all the files, with some slower (iscsi) and some faster (ssd) and the
>>> ability to pick which ones are in the faster group at the cost of one
>>> content transfer.

   I am thinking why not indeed leverage seed/sprout for this.
   Let me see how I (or if anyone could) allocate time to experiment
   on this.

  Thanks for your use case !

-Anand