You hit the slow DB connection issue described in SAP note 1730855.
As it takes time to address the NFS problem, you have to place the CLI driver to a local path of the application server as a workaround
You want to know how to temporarily set the environment variable DB2_CLI_DRIVER_INSTALL_PATH accordingly to make it effective.
SAP on IBM Db2 for Linux and UNIX.
DB2_CLI_DRIVER_INSTALL_PATH, , KBA , BC-DB-DB6 , DB2 Universal Database for Unix / NT , BC-DB-DB6-DBA , Database Administration with DB2 Universal Database , How To
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