On 8/14/19 5:46 PM, Lorenz Kiefner wrote:
Hi,
this was the first thing I was thinking about (and yes, there had been
some issues, but they are resolved - double checked!).
MTU is consistent throughout the whole net and pings in all sizes are
handled well. And MTU problems wouldn't probably make a difference
between backfills and normal operations, I assume (I use a single
network design). And in case of a MTU problem I would suspect that all
OSDs on a wrong configured host would go down, or am I wrong?
Is ceph sensitive to packet loss? On some VPN links I have up to 20%
packet loss on 64k packets but less than 3% on 5k packets in the evenings.
Yes, it is! 20%, but even 3% is a very, very high number when it comes
to packet loss. This should be almost 0%.
Ceph is designed to work on low latency networks usually within one
datacenter.
> Perhaps TCP retransmits trigger some timeouts. Any suggestions how to
> tune this? I tried setting osd_heartbeat_grace to 120, but this doesn't
> help...
>
>
> Thanks for any ideas!
>
>
> Lorenz
>
>
> Am 14.08.19 um 13:56 schrieb Paul Emmerich:
>> MTU issues due to the VPN connection?
>>
>>
>> Paul
>>
> _______________________________________________
> ceph-users mailing list -- ceph-users(a)ceph.io
> To unsubscribe send an email to ceph-users-leave(a)ceph.io
>