On 12/10/17 07:55, Gandalf Corvotempesta wrote:
For this project I'll use v8
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
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.
For me, I mainly still use v8 in production.
Regards,
Adam
Il 11 ott 2017 10:48 PM, "Yannis Milios" <yannis.mil...@gmail.com
<mailto:yannis.mil...@gmail.com>> ha scritto:
Are you planning to use DRBD8 or DRBD9?
DRBD8 is limited to 2 nodes(max 3).
DRBD9 can scale to multiple nodes.
For DRBD8 the most common setup is RAID -> DRBD -> LVM or RAID
-> LVM -> DRBD
It’s management is way easier than DRBD9.
The most common DRBD9 setups are RAID -> LVM (thin or thick) ->
DRBD or HDD -> ZFS (thin or thick) -> DRBD.
Complicated management...
On Wed, 11 Oct 2017 at 20:52, Gandalf Corvotempesta
<gandalf.corvotempe...@gmail.com
<mailto:gandalf.corvotempe...@gmail.com>> wrote:
2017-10-11 21:22 GMT+02:00 Adam Goryachev
<mailingli...@websitemanagers.com.au
<mailto:mailingli...@websitemanagers.com.au>>:
> You can also do that with raid + lvm + drbd... you just need
to create a new
> drbd as you add a new LV, and also resize the drbd after you
resize the LV.
I prefere to keep drbd as minimum. I'm much more familiar with
LVM.
If not an issue, i prefere to keep the number of drbd
resources as bare minimum.
> If both drives fail on one node, then raid will pass the
disk errors up to
> DRBD, which will mark the local storage as down, and yes, it
will read all
> needed data from remote node (writes are always sent to the
remote node).
> You would probably want to migrate the remote node to
primary as quickly as
> possible, and then work on fixing the storage.
Why should I migrate the remote node to primary? Any advantage?
> Yes, it is not some bizarre configuration that has never
been seen before.
> You also haven't mentioned the size of your proposed raid,
nor what size you
> are planning on growing it to?
Currently, I'm planning to start with 2TB disks. I don't think
to go
over 10-12TB
> Yes, you will always want multiple network paths between the
two nodes, and
> also fencing. bonding can be used to improve performance,
but you should
> *also* have an additional network or serial or other
connection between the
> two nodes which is used for fencing.
Ok.
Any "bare-metal" distribution with DRBD or detailed guide on
how to
implement HA?
Something like FreeNAS, or similiar.
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