<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 class="gmail_quote">Il 11 ott 2017 10:48 PM, "Yannis Milios" <<a href="mailto:yannis.milios@gmail.com">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">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">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>
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