Re: HA and data recovery of CEPH

[jesper@xxxxxxxx]

Hi Nathan

Is that true?

The time it takes to reallocate the primary pg delivers “downtime” by design.  right? Seen from a writing clients perspective 

Jesper

Sent from myMail for iOS

Friday, 29 November 2019, 06.24 +0100 from pengbo@xxxxxxxxxxx <pengbo@xxxxxxxxxxx>:

Hi Nathan, 

Thanks for the help.

My colleague will provide more details.

BR

On Fri, Nov 29, 2019 at 12:57 PM Nathan Fish <lordcirth@xxxxxxxxx> wrote:

If correctly configured, your cluster should have zero downtime from a
single OSD or node failure. What is your crush map? Are you using
replica or EC? If your 'min_size' is not smaller than 'size', then you
will lose availability.

On Thu, Nov 28, 2019 at 10:50 PM Peng Bo <pengbo@xxxxxxxxxxx> wrote:
>
> Hi all,
>
> We are working on use CEPH to build our HA system, the purpose is the system should always provide service even a node of CEPH is down or OSD is lost.
>
> Currently, as we practiced once a node/OSD is down, the CEPH cluster needs to take about 40 seconds to sync data, our system can't provide service during that.
>
> My questions:
>
> Does there have any way that we can reduce the data sync time?
> How can we let the CEPH keeps available once a node/OSD is down?
>
>
> BR
>
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