Gluster users - May 2017 - small files optimizations

Currently, which are the best small files optimization that we can enable
on a gluster storage?

I'm planning to move a couple of dovecot servers, with thousands mail files
(from a couple of KB to less than 10-20MB)

These optimizations are compatible with VMs workload, like sharding?
As gluster doesn't support to "share" bricks with multiple
volumes, I would
like to create a single volume with VMs and maildirs

Does it make sense ?

Would be interesting to implement a soft of logical volume (with it's own
feature settings) on top of the same bricks?
Like LVM on a disk.
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> As gluster doesn't support to "share" bricks with multiple
volumes, I would
> like to create a single volume with VMs and maildirs
Just create two bricks for two volumes ?
For example if your disk is /mnt/storage, have a
/mnt/storage/brick_VM and a /mnt/storage/brick_mail or something like that.
It'll be a lot cleaner I think
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