Subject FW and Journaling
Author Carlos H. Cantu
It is well known that the writing performance of FB databases on
linux, when you have Forced Writes ON and the filesystem has the
journaling parameter active is horrible and almost unusable if you
have lots of writing (or even worse, massive/batch updates).

Question is:

What would be safer:

Keep FW OFF and Journaling ON
Keep FW ON and Journaling OFF

Firebird Performance in Detail - -