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Hello,
we have a question for you regarding the gluster arbiter and
the network throughput required for metadata transfer.
From the
documentation and the forum, I understood that the smallest
metadata file depends on how large the smallest file (block)
of the filesystem can be and that it is good to count on a
4Kb metadata file.
I want to ask whether
this 4Kb metadata file is transferred every time a file is
changed from the gluster node to the arbiter, or whether
only the changed metadata (for example 100 bits) is
transferred from the gluster node to the arbiter and the
arbiter somehow writes this changed metadata (the 100 bits)
to the metadata file it previously created.
I am asking because I want to find out how much network
throughput will be needed from the gluster node to the
gluster arbiter.
so:
if I have 20 files on a gluster node, and the change will be
2000 in 1s, then what network throughput will it take from
the gluster node to the gluster arbiter if the metadata file
is 4Kb?
a) will it be 20x2000x4(Kb)=160000Kb=160Mb
metadata
160Mb metadata x8=1.28Gbps?
b) will it be 20x2000x0.1(Kb)=4000Kb=4Mb metadata
4Mb metadata x8=32Mbps?
c) or is it something else?
Thank you very much in advance for your answer.
Jakub Kafka
CAP s.r.o.
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