[Gluster-users] Gluster considerations - replicated volumes in different sites

[Tom Farrar]

Good Morning All,

I'm looking at deploying 3 Gluster nodes, two in one location and the third
in another. The link between these two locations is fast and fairly low
latency, around ~4ms. The volumes are all low write/high read with the
largest being a few TBs (with lots of small files). While the primary
location will have two nodes in, the secondary location (with one node)
will see local reads and writes.

I'm a little concerned about running the replication in separate locations
given that from what I've read Gluster doesn't like latency. Is this a
valid concern? I've seen a few options for what I believe is keeping reads
local so they don't go to the distant node, but I'm struggling to find a
definitive answer (cluster.read-subvolume perhaps).

Also, in terms of configuration for low write/high read and a large volume
of small files, the following seems to be the recommended from what I can
cobble together - does this seem ok?

Options Reconfigured:
performance.readdir-ahead: on
cluster.ensure-durability: off
server.event-threads: 4
cluster.lookup-optimize: on
performance.quick-read: on
cluster.readdir-optimize: on

Many thanks,

Tom
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