dovecot - Nov 2014 - indexes with ocfs2

Hi guys!

I'm having performance issues with my dovecot+ocfs2 environment, so I'm 
thinking about some changes.

Now, I have mail store and indexes stored in a iscsi-ocfs2 volume with 
that options:

mmap_disable = yes
dotlock_use_excl = yes
mail_fsync = always
mail_nfs_storage = yes
mail_nfs_index = yes
lock_method = dotlock

I want to change indexes to local volume ext4 and do this:

mmap_disable = no
mail_nfs_index = no

Could it cause some problem?

Thanks.