[Gluster-users] Node count constraints with EC?

[Terry McGuire]

Hello list.  Newbie question:  I’m building a low-performance/low-cost storage service with a starting size of about 500TB, and want to use Gluster with erasure coding.  I’m considering subvolumes of maybe 4+2, or 8+3 or 4.  I was thinking I’d spread these over 4 nodes, and add single nodes over time, with subvolumes rearranged over new nodes to maintain protection from whole node failures.

However, reading through some RedHat-provided documentation, they seem to suggest that node counts should be a multiple of 3, 6 or 12, depending on subvolume config.  Is this actually a requirement, or is it only a suggestion for best performance or something?

Can anyone comment on node count constraints with erasure coded subvolumes?

Thanks in advance for anyone’s reply,
Terry

_____________________________
Terry McGuire
Information Services and Technology (IST)
University of Alberta
Edmonton, Alberta, Canada  T6G 2H1
Phone:  780-492-9422

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