[ceph-users] default data pools for cephfs: replicated vs. ec

hi there, recently, we've come across a lot of advice to only use replicated rados pools as default- (ie: root-) data pools for cephfs¹. unfortunately, we either skipped or blatantly ignored this advice while creating our cephfs, so our default data pool is an erasure coded one with k=2 and m=4, which _should_ be fine availability-wise. could anyone elaborate on the impacts regarding the performance of the whole setup? if a migration to a replicated pool is recommend: would a simple ceph osd pool set $default_data crush_rule $something_replicated suffice, or would you recommend a more elaborated approach, something along the lines of taking the cephfs down, copy contents of default_pool to default_new, rename default_new default_pool, taking the cephfs up again? thank you very much & with kind regards, t. ¹ - see, for instance, https://tracker.ceph.com/issues/42450 .