Hi All,
I build a Gluster 3.8.4 (RHGS 3.2) cluster for a customer, and I am having some issue demonstrating that it performs well.
The customer compares it with his old NFS based NAS, and runs FIO to test workloads.
What I notice is that FIO throughtput is only +-20Mb/s, which is not a lot.
When I do a simple test with dd I easily get 600Mb/s throughput.
In
the fio job file the option "direct=1" is used, which bypasses caching.
If we run a fio job with direct=0 the performance goes up a lot, and is
near 600Mb/s as well.
The customer insists that on his old
system (that Gluster should replace) he could get 600Mb/s throughput
with fio, with the setting direct=1. and that he was rather underwhelmed
by the performance of Gluster here.
What I need is answers to either:
-
Have I overlooked something? I have not really done much tuning yet. Is
there some obvious paremeter I overlooked that could change the results
of a fio performance test?
or:
- Is testing
with "direct=1" not really a way to test Gluster, as the cache is a
rather important part of what is needed to make gluster perform?
--
Vriendelijke Groet | Best Regards | Freundliche Grüße | Cordialement
Krist van Besien | Senior Architect | Red Hat EMEA Cloud Practice | RHCE | RHCSA Open Stack _______________________________________________
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