On 23 Jul 2013, at 17:16, Gregory Farnum wrote:
>> And without wanting to sound daft having missed a salient configuration
>> detail, but there's no way to release when it's written the primary?
>
> Definitely not. Ceph's consistency guarantees and recovery mechanisms
> are all built on top of a
On 23 July 2013 17:16, Gregory Farnum wrote:
> > And without wanting to sound daft having missed a salient configuration
> > detail, but there's no way to release when it's written the primary?
>
> Definitely not.
>
I thought as much -- and now you've explained why, I completely understand
the
On Tue, Jul 23, 2013 at 9:12 AM, Matthew Walster wrote:
> On 23 July 2013 17:07, Gregory Farnum wrote:
>>
>> If you have three osds that are
>> separated by 5ms each and all hosting a PG, then your lower-bound
>> latency for a write op is 10ms — 5 ms to send from the primary to the
>> replicas,
On 23 July 2013 17:07, Gregory Farnum wrote:
> If you have three osds that are
> separated by 5ms each and all hosting a PG, then your lower-bound
> latency for a write op is 10ms — 5 ms to send from the primary to the
> replicas, 5ms for them to ack back.
And without wanting to sound daft ha
On Tue, Jul 23, 2013 at 9:04 AM, Matthew Walster wrote:
>
> That's fantastic, thanks. I'm assuming that 5ms is probably too much for the
> OSDs -- do we have any idea/data as to the effect of latency on OSDs if they
> were split over a similar distance? Or even a spread - 0.5ms, 1ms, 2ms etc.
> Ob
On 23 July 2013 16:59, Gregory Farnum wrote:
> On Tue, Jul 23, 2013 at 8:54 AM, Matthew Walster
> wrote:
> > I've got a relatively small Ceph cluster I'm playing with at the moment,
> and
> > against advice, I'm running the MONs on the OSDs.
> >
> > Ideally, I'd like to have half the OSDs in a d
On Tue, Jul 23, 2013 at 8:54 AM, Matthew Walster wrote:
> I've got a relatively small Ceph cluster I'm playing with at the moment, and
> against advice, I'm running the MONs on the OSDs.
>
> Ideally, I'd like to have half the OSDs in a different facility and
> therefore have one MON in each facili
I've got a relatively small Ceph cluster I'm playing with at the moment,
and against advice, I'm running the MONs on the OSDs.
Ideally, I'd like to have half the OSDs in a different facility and
therefore have one MON in each facility.
Which gives the problem of where to put that pesky third MON.
