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On 8/1/18 11:04 AM, Amar Tumballi wrote:<br>
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<div><span
style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">This
recently added document talks about some of the
technicalities of the feature:</span>
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<div
style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><a
href="https://docs.gluster.org/en/latest/Administrator%20Guide/Thin-Arbiter-Volumes/"
moz-do-not-send="true">https://docs.gluster.org/en/latest/Administrator%20Guide/Thin-Arbiter-Volumes/</a></div>
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<div
style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">Please
go through and see if it answers your questions.</div>
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<div
style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">-Amar</div>
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<br>
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.<br>
At least until you have to deal with a failure situation.<br>
<br>
Though the "would you use it on a VM, either now or when the code is
more seasoned?" question is still there.<br>
<br>
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.<br>
<br>
-wk<br>
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<div class="gmail_quote">On Wed, Aug 1, 2018 at 11:09 PM,
wkmail <span dir="ltr"><<a
href="mailto:wkmail@bneit.com" target="_blank"
moz-do-not-send="true">wkmail@bneit.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">I see mentions of
thin arbiter in the 4.x notes and I am intrigued.<br>
<br>
As I understand it, the thin arbiter volume is<br>
<br>
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.<br>
<br>
b) is only consulted in situations where Gluster needs
that third vote, otherwise it is not consulted.<br>
<br>
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)<br>
<br>
Am I correct?<br>
<br>
If so, is thin arbiter ready for production or at least
use on non-critical workloads?<br>
<br>
How safe is it for VMs images (and/or VMs with
sharding)?<br>
<br>
How much faster is thin arbiter setup over a normal
arbiter given that the normal data only really sees the
metadata?<br>
<br>
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?<br>
<br>
Sincerely,<br>
<br>
-wk<br>
<br>
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-- <br>
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<div>Amar Tumballi (amarts)<br>
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