[Gluster-users] latency limits of glusterfs for replicated mod

[Oğuz Yarımtepe]

Hi,

I have 4 node GlusterFS running on two different locations in replicated
mode. The nodes are splitted equally and the latency is 0.3ms. So i have no
problem about replicating so far.

Now i want to add two more node at another distance that has |13ms latency.
Is it said that replication will not be running in a good way and thing may
get obscured and it is not suggested to use in that much latencies.

What is the latency limit for GlusterFS while using replicated mode?

[Vlad Kopylov]

Works with same latency for me on 3.12.15
Only problem is that read and write gets slow.
If you host VMs having hypervisor use gfapi: writes will be acceptable, but
read will wonder through nodes, obviously slowing down. 0.3 to 13 ms x 2
around 100 times slower.

There is select local and latency(and queue) read replica selection
functionality in progress https://github.com/gluster/glusterfs/issues/520
Plus halo writes from facehook to make writes replicate on background.
Though I was unable to confirm readiness of any of above functionality in
practice. You can follow or file github issues.

v

Post by Oğuz Yarımtepe
Hi,
I have 4 node GlusterFS running on two different locations in replicated
mode. The nodes are splitted equally and the latency is 0.3ms. So i have no
problem about replicating so far.
Now i want to add two more node at another distance that has |13ms
latency. Is it said that replication will not be running in a good way and
thing may get obscured and it is not suggested to use in that much
latencies.
What is the latency limit for GlusterFS while using replicated mode?
--
Oğuz Yarımtepe
http://about.me/oguzy
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