01.08.2018 22:04, Amar Tumballi пишет:
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
Hello!
I have question:
Manual says:
"When one brick is up: Fail FOP with EIO."
So, if we have 2 nodes with thin arbiter and only one node is up, i.e.
second node is down for some reason, then I/O will be stopped.
Any reasons to have two nodes then?
Could you tell me is manual right here or it is misprint?
Thank you!
On Wed, Aug 1, 2018 at 11:09 PM, wkmail <[email protected]
<mailto:[email protected]>> 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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