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<div class="moz-cite-prefix">On 12/10/17 07:55, Gandalf
Corvotempesta wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAJH6TXjKPSEN9qMVdioOk7GGu=y5pPnOE9iZ1EJcwsWi1=S+ow@mail.gmail.com">
<div dir="auto">For this project I'll use v8
<div dir="auto">As I would like to use just one big resource, I
don't think v9 would be able to rebalance a single resource
across 4 or 5 nodes</div>
</div>
<div class="gmail_extra"><br>
</div>
</blockquote>
v9 would allow for a 3 node mirror, which improves redundancy and
resiliency, and I assume makes split-brain avoidance much
simpler/more reliable to stonith the right node.<br>
<br>
For me, I mainly still use v8 in production.<br>
<br>
Regards,<br>
Adam<br>
<br>
<blockquote type="cite"
cite="mid:CAJH6TXjKPSEN9qMVdioOk7GGu=y5pPnOE9iZ1EJcwsWi1=S+ow@mail.gmail.com">
<div class="gmail_extra">
<div class="gmail_quote">Il 11 ott 2017 10:48 PM, "Yannis
Milios" <<a href="mailto:yannis.milios@gmail.com"
moz-do-not-send="true">yannis.milios@gmail.com</a>> ha
scritto:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div dir="auto">Are you planning to use DRBD8 or DRBD9?</div>
<div dir="auto"><br>
</div>
<div dir="auto">DRBD8 is limited to 2 nodes(max 3).</div>
<div dir="auto">DRBD9 can scale to multiple nodes.</div>
<div dir="auto"><br>
</div>
<div dir="auto">For DRBD8 the most common setup is RAID
-> DRBD -> LVM or RAID -> LVM -> DRBD</div>
<div dir="auto">It’s management is way easier than DRBD9.</div>
<div dir="auto"><br>
</div>
<div dir="auto">The most common DRBD9 setups are RAID
-> LVM (thin or thick) -> DRBD or HDD ->
ZFS (thin or thick) -> DRBD.</div>
<div dir="auto">Complicated management... <br>
</div>
<br>
<div class="gmail_quote">
<div>On Wed, 11 Oct 2017 at 20:52, Gandalf Corvotempesta
<<a href="mailto:gandalf.corvotempesta@gmail.com"
target="_blank" moz-do-not-send="true">gandalf.corvotempesta@gmail.<wbr>com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">2017-10-11
21:22 GMT+02:00 Adam Goryachev <<a
href="mailto:mailinglists@websitemanagers.com.au"
target="_blank" moz-do-not-send="true">mailinglists@websitemanagers.<wbr>com.au</a>>:<br>
> You can also do that with raid + lvm + drbd...
you just need to create a new<br>
> drbd as you add a new LV, and also resize the
drbd after you resize the LV.<br>
<br>
I prefere to keep drbd as minimum. I'm much more
familiar with LVM.<br>
If not an issue, i prefere to keep the number of drbd
resources as bare minimum.<br>
<br>
> If both drives fail on one node, then raid will
pass the disk errors up to<br>
> DRBD, which will mark the local storage as down,
and yes, it will read all<br>
> needed data from remote node (writes are always
sent to the remote node).<br>
> You would probably want to migrate the remote
node to primary as quickly as<br>
> possible, and then work on fixing the storage.<br>
<br>
Why should I migrate the remote node to primary? Any
advantage?<br>
<br>
> Yes, it is not some bizarre configuration that
has never been seen before.<br>
> You also haven't mentioned the size of your
proposed raid, nor what size you<br>
> are planning on growing it to?<br>
<br>
Currently, I'm planning to start with 2TB disks. I
don't think to go<br>
over 10-12TB<br>
<br>
> Yes, you will always want multiple network paths
between the two nodes, and<br>
> also fencing. bonding can be used to improve
performance, but you should<br>
> *also* have an additional network or serial or
other connection between the<br>
> two nodes which is used for fencing.<br>
<br>
Ok.<br>
<br>
Any "bare-metal" distribution with DRBD or detailed
guide on how to<br>
implement HA?<br>
Something like FreeNAS, or similiar.<br>
______________________________<wbr>_________________<br>
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</blockquote>
</div>
</div>
<div dir="ltr">-- <br>
</div>
<div class="m_282225625723366107gmail_signature"
data-smartmail="gmail_signature">Sent from Gmail Mobile</div>
</blockquote>
</div>
</div>
</blockquote>
<p><br>
</p>
<div class="moz-signature">-- <br>
Adam Goryachev
Website Managers
<a class="moz-txt-link-abbreviated" href="http://www.websitemanagers.com.au">www.websitemanagers.com.au</a></div>
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