We do not support the use of osF on a NAS Drive.
Do you want to try anyway? Then here is the explanation for the firebird installation.
REMOTE FILE OPEN ABILITY
Purpose
Gebruik de RemoteFileOpenAbility-parameter om beveiliging te verwijderen tegen het openen van databases op NFS-gekoppelde volumes op Posix-systemen
Syntax
<rem_file_enable> ::=
RemoteFileOpenAbility = <boolean>
Semantics
This option removes an important safety feature of Firebird and can cause irrecoverable database corruption. Removing this safety feature is necessary on NAS (network attached storage) server hardware.
Unless this configuration option is changed from 0 to 1, Firebird can open a database only if the database is stored on a drive physically attached to the local computer - the computer running that copy of Firebird. Requests for connections to databases stored on NFS mounted drives are redirected to a Firebird server running on the computer that "owns" the disk.
This restriction prevents two different copies of Firebird from opening the same database without coordinating their activities. Uncoordinated access by multiple copies of Firebird will corrupt a database. On a local system, the system-level file locking prevents uncoordinated access to the database file.
NFS does not provide a reliable way to detect multiple users of a file on an NFS mounted disk. If a second copy of Firebird connects to a database on an NFS mounted disk, it will corrupt the database.
DO NOT ENABLE THIS OPTION UNLESS YOU REALLY KNOW WHAT YOU ARE DOING.
Example
The below example enables NFS mounted database files;
RemoteFileOpenAbility = 1