Re: [Gluster-devel] Full bore.

[Chris Johnson]

     Ok, hi.

     I think I'm committing a major blunder here which may be why I'm
not seeing better through put.

     These xlators should be stacked, is that right?  I defined the
following;

volume brick1
  type storage/posix
  option directory /home/sdm1
end-volume

volume server
  type protocol/server
  subvolumes brick1
  option transport-type tcp/server     # For TCP/IP transport
#  option client-volume-filename /etc/glusterfs/glusterfs-client.vol
  option auth.ip.brick1.allow *
end-volume

volume writebehind
  type performance/write-behind
  option aggregate-size 131072 # in bytes
  subvolumes brick1
end-volume

volume readahead
  type performance/read-ahead
  option page-size 65536 ### in bytes
  option page-count 16 ### memory cache size is page-count x page-size
per file
  subvolumes brick1
end-volume

Should I have used the 'server' volume as the subvolume for read-ahead
and write-behind in the above?  Or should read-ahead and write-behind
be between the basic brick and the server volume?  Is there a
diffrence in performance?

     I grabbed 5 volumes from the SATA Beast.  I think the best way to
test this is with the real files and jobs.  So it's go for broke and
full bore time.

     If I have two front ends I need I'll need the postix lock deal,
the io threader is a must or why bother.  If I unify, both front ends
need access to the same namespace brick so it has to have locks on it
too, yes?

     Looking at the GlusterFS Translators v1.3 server examples.  Why
is the io thread xlator so high up in the stack?  Would it be better
farther down that stack closer to the basic bricks?  If not, why not?

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