Re: Worst thing that can happen if I have size= 2

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День добрий! 

 Wed, Feb 03, 2021 at 09:29:52AM +0000, Magnus.Hagdorn wrote: 

> if a OSD becomes unavailble (broken disk, rebooting server) then all
> I/O to the PGs stored on that OSD will block until replication level of
> 2 is reached again. So, for a highly available cluster you need a
> replication level of 3

AFAIK, with min_size 1 it is possible to write even to only active OSD serving
PG.

> On Wed, 2021-02-03 at 10:24 +0100, Mario Giammarco wrote:
> > Hello,
> > Imagine this situation:
> > - 3 servers with ceph
> > - a pool with size 2 min 1
> >
> > I know perfectly the size 3 and min 2 is better.
> > I would like to know what is the worst thing that can happen:
> >
> > - a disk breaks and another disk breaks before ceph has reconstructed
> > second replica, ok I lose data
> >
> > - if network goes down and so monitors lose quorum do ceph still
> > write on
> > disks?
> >
> > What else?
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