Hi David,

Redeploying 2 out of 3 MONs a few weeks back (to have them using RocksDB to be 
ready for Quincy) prevented some clients from connecting to the cluster and 
mounting cephfs volumes.

Before the redeploy, these clients were using port 6789 (v1) explicitly as 
connections wouldn't work with port 3300 (v2).
After the redeploy, removing port 6789 from mon_ips fixed the situation.

Seems like msgr v2 activation did only occur after all 3 MONs were redeployed 
and used RocksDB. Not sure why this happened though.

@Albert, if this cluster has been upgrade several times, you might want to 
check /var/lib/ceph/$(ceph fsid)/kv_backend, redeploy the MONS if leveldb, make 
sure all clients use the new mon_host syntax in ceph.conf 
([v2:<cthulhu1_ip>:3300,v1:<cthulhu1_ip>:6789],etc.]) and check their ability 
to connect to port 3300.

Cheers,
Frédéric.

----- Le 16 Juil 24, à 17:53, David [email protected] a écrit :

> Albert,
> 
> The network is ok.
> 
> However, strangely, the osd and mds did not activate msgr v2 (msgr v2 was
> activated on mon).
> 
> It is possible to bypass by adding the "ms_mode=legacy" option but you need
> to find out why msgr v2 is not activated
> 
> 
> Le mar. 16 juil. 2024 à 15:18, Albert Shih <[email protected]> a écrit :
> 
>> Le 16/07/2024 à 15:04:05+0200, David C. a écrit
>> Hi,
>>
>> >
>> > I think it's related to your network change.
>>
>> I though about it but in that case why the old (and before upgrade) server
>> works ?
>>
>> > Can you send me the return of "ceph report" ?
>>
>> Nothing related to the old subnet. (see attach file)
>>
>> Regards.
>>
>> JAS
>> --
>> Albert SHIH 🦫 🐸
>> Observatoire de Paris
>> France
>> Heure locale/Local time:
>> mar. 16 juil. 2024 15:14:21 CEST
>>
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