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<div class="moz-cite-prefix">On 08/02/2018 06:26 AM, W Kern wrote:<br>
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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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style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br>
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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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style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br>
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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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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>
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Hi WK, <br>
<br>
There are a few patches [1] that are still undergoing review . It
would be good to wait for some more time until trying it out. If you
are interested in testing, I'll be happy to inform you once they get
merged.<br>
<br>
[1] <a class="moz-txt-link-freetext" href="https://review.gluster.org/#/c/20095/">https://review.gluster.org/#/c/20095/</a>,
<a class="moz-txt-link-freetext" href="https://review.gluster.org/#/c/20103/">https://review.gluster.org/#/c/20103/</a>,
<a class="moz-txt-link-freetext" href="https://review.gluster.org/#/c/20577/">https://review.gluster.org/#/c/20577/</a><br>
<br>
Regards,<br>
Ravi<br>
<br>
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<blockquote type="cite"
cite="mid:13d1c458-ec0f-cc2e-c6ea-430ecdd4d682@bneit.com"> <br>
-wk<br>
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cite="mid:CAHxyDdMAp9OMDpT11k+DEDihLPFyG_hiEjYcy-WF_FA04e7=CQ@mail.gmail.com">
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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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