Hi list,
I am in the process of planning a 3-node replica 3 setup and I have a
question about scaling it out.
From what I understood, in order to be able to scale it one node at a
time, I need to set up the initial nodes with a number of bricks that is
a multiple of 3 (e.g., 3, 6, 9, etc. bricks). The initial cluster will
be able to export a volume as large as the storage of a single node and
adding one more node will grow the volume by 1/3 (assuming homogeneous
nodes.)
Please let me know if my understanding is correct.
My plan is to use ZFS as the underlying system for the bricks. Now I'm
wondering - if I join the disks on each node in a, say, RAIDZ2 pool and
then create a dataset within the pool for each brick, the GlusterFS
volume would report the volume size 3x$brick_size, because each brick
shares the same pool and the size/free space is reported according to
the ZFS pool size/free space.
How should I go about this? Should I create a ZFS pool per brick (this
seems to have a negative impact on performance)? Should I set a quota
for each dataset?
Does my plan even make sense?
Thank you!
Best regards,
--
alexander iliev
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