I am sure this has come up before but I could not find an answer.

One of our customers wants to defrag the database server and I feel
that our software should be fine with a defrag at any time. Of course,
it would be best after hours for server performance reasons, IMO.

I do have a slight concern about how our database server would react to
a defrag. What is the effect, if any, of defragging the disk at a
server while the Firebird database is active?

-Eduardo