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
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
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
On 05/16/2018 09:35 PM, Webert de Souza Lima wrote:
> We'll soon do benchmarks of sdbox vs mdbox over cephfs with bluestore
> backend.
> We'll have to do some some work on how to simulate user traffic, for writes
> and readings. That seems troublesome.
I would appreciate seeing these results !
>
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.
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.
Hi,
Many (most ?) filesystems does not store multiple files on the same block
Thus, with sdbox, every single mail (you know, that kind of mail with 10
lines in it) will eat an inode, and a block (4k here)
mdbox is more compact on this way
Another difference: sdbox removes the message, mdbox
