[PVE-User] Ceph and cold bootstrap...

Eneko Lacunza elacunza at binovo.es
Fri Sep 16 14:59:50 CEST 2016

I have set up a 3-node PVE+Ceph node and recolated it without issues.

It is true that when powering on the cluster care must be taken so that 
all nodes start within about a minute; I tuned grub waiting seconds for 
this, so that fast nodes wait for slow nodes.

El 16/09/16 a las 14:02, Adam Thompson escribió:
> We've observed that if any of the nodes boot much faster or slower than the other nodes, this causes big problems with both CEPH and PVE, particularly with quorum issues.
> I've just finished switching a 9-node cluster to NFS because CEPH was too unreliable after repeated power failure crashes.
> Turns out powering off the last few nodes is hard because they've lost quorum by that point and hang during shutdown for longer than the UPSes last.
> Unless you have redundant power (I.e. generator) I'm not sure I would ever recommend a large PVE+CEPH cluster again.
> -Adam
> On September 16, 2016 4:36:41 AM CDT, Marco Gaiarin <gaio at sv.lnf.it> wrote:
>> Mandi! Fabian Grünbichler
>>   In chel di` si favelave...
>>> two ceph nodes, two mons and two osds are all way too few for a
>>> (production) ceph setup.
>> I know, this is my 'test' ceph cluster as stated... ;-)
>>> at least three nodes/mons (for quorum reasons),
>>> and multiple osds per storage node (for performance and failure
>> reasons)
>>> are required.
>> Production, as planned, will have 3 nodes/mon, and 2 OSD per node.
>> I'm simply curious if starting a ceph cluster from cold iron could be a
>> common failure condition, or is a consequence of my little setup...
>> -- 
>> dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
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