Re: [ceph-users] dovecot + cephfs - sdbox vs mdbox

2018-10-04 Thread Webert de Souza Lima
Hi, bring this up again to ask one more question: what would be the best recommended locking strategy for dovecot against cephfs? this is a balanced setup using independent director instances but all dovecot instances on each node share the same storage system (cephfs). Regards, Webert Lima

Re: [ceph-users] dovecot + cephfs - sdbox vs mdbox

2018-05-16 Thread Webert de Souza Lima
Thanks Jack. That's good to know. It is definitely something to consider. In a distributed storage scenario we might build a dedicated pool for that and tune the pool as more capacity or performance is needed. Regards, Webert Lima DevOps Engineer at MAV Tecnologia *Belo Horizonte - Brasil* *IRC

Re: [ceph-users] dovecot + cephfs - sdbox vs mdbox

2018-05-16 Thread Webert de Souza Lima
Hello Danny, I actually saw that thread and I was very excited about it. I thank you all for that idea and all the effort being put in it. I haven't yet tried to play around with your plugin but I intend to, and to contribute back. I think when it's ready for production it will be unbeatable. I

Re: [ceph-users] dovecot + cephfs - sdbox vs mdbox

2018-05-16 Thread Danny Al-Gaaf
Hi, some time back we had similar discussions when we, as an email provider, discussed to move away from traditional NAS/NFS storage to Ceph. The problem with POSIX file systems and dovecot is that e.g. with mdbox only around ~20% of the IO operations are READ/WRITE, the rest are metadata IOs.

Re: [ceph-users] dovecot + cephfs - sdbox vs mdbox

2018-05-16 Thread Webert de Souza Lima
Hello Jack, yes, I imagine I'll have to do some work on tuning the block size on cephfs. Thanks for the advise. I knew that using mdbox, messages are not removed but I though that was true in sdbox too. Thanks again. We'll soon do benchmarks of sdbox vs mdbox over cephfs with bluestore backend.

dovecot + cephfs - sdbox vs mdbox

2018-05-16 Thread Webert de Souza Lima
I'm sending this message to both dovecot and ceph-users ML so please don't mind if something seems too obvious for you. Hi, I have a question for both dovecot and ceph lists and below I'll explain what's going on. Regarding dbox format (https://wiki2.dovecot.org/MailboxFormat/dbox), when using