Is it possible to access the same file from multiple nodes at the same time?

Question

Ceph

There is CephFS, let's say there is a single file in this storage. This file directory is mounted on different client hosts. Will ceph allow writing to this file from different hosts at the same time? That is, is there some kind of file lock during recording or write order?

Answer 1

Will give.
The file can be locked.
There is no guarantee about the time when the result of writing to a file on host A will become visible on host B, there is no guarantee that simultaneous writing without blocking will not turn out to be messy.
See section 1.4