On 8/1/18 11:04 AM, Amar Tumballi wrote:
This recently added document talks about some of the technicalities of
the feature:
https://docs.gluster.org/en/latest/Administrator%20Guide/Thin-Arbiter-Volumes/
Please go through and see if it answers your questions.
-Amar
Well yes that does answer some. By skipping a lot more of the arbiter
traffic, there may be some noticeable performance benefits especially in
an older 1G network.
At least until you have to deal with a failure situation.
Though the "would you use it on a VM, either now or when the code is
more seasoned?" question is still there.
I'm willing to try it out on some non-critical VMs (cloud-native stuff,
where I always spawn from a golden image), but if it is not ready for
production, then I don't want to bother with it at the moment.
-wk
On Wed, Aug 1, 2018 at 11:09 PM, wkmail <wkm...@bneit.com
<mailto:wkm...@bneit.com>> wrote:
I see mentions of thin arbiter in the 4.x notes and I am intrigued.
As I understand it, the thin arbiter volume is
a) receives its data on an async basis (thus it can be on a slower
link). Thus gluster isn't waiting around to verify if it actually
got the data.
b) is only consulted in situations where Gluster needs that third
vote, otherwise it is not consulted.
c) Performance should therefore be better because Gluster is only
seriously talking to 2 nodes instead of 3 nodes (as in normal
arbiter or rep 3)
Am I correct?
If so, is thin arbiter ready for production or at least use on
non-critical workloads?
How safe is it for VMs images (and/or VMs with sharding)?
How much faster is thin arbiter setup over a normal arbiter given
that the normal data only really sees the metadata?
In a degraded situation (i.e. loss of one real node), would having
a thin arbiter on a slow link be problematic until everything is
healed and returned to normal?
Sincerely,
-wk
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Amar Tumballi (amarts)
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