Technical data

Configuring and Managing FTP
15.1 Managing FTP
• SYS$LOGIN:FTP_SERVER_RUN.LOG
This log is created in the user’s default login directory.
The number of log files (one per FTP session) might become large. To limit the
number of versions, enter:
$ SET FILE file /VERSION=n
15.1.3.2 FTP Startup and Shutdown
The FTP service can be shut down and started independently from TCP/IP
Services. This is useful when you change parameters or logical names that
require the service to be restarted.
The following files are provided:
• SYS$STARTUP:TCPIP$FTP_STARTUP.COM allows you to start up FTP
independently.
• SYS$STARTUP:TCPIP$FTP_SHUTDOWN.COM allows you to shut down
FTP independently.
To preserve site-specific parameter settings and commands, create the following
files. These files are not overwritten when you reinstall TCP/IP Services:
• SYS$STARTUP:TCPIP$FTP_SYSTARTUP.COM can be used as a repository
for site-specific definitions and parameters to be invoked when FTP is started.
• SYS$STARTUP:TCPIP$FTP_SYSHUTDOWN.COM can be used as a
repository for site-specific definitions and parameters to be invoked when
FTP is shut down.
15.2 Solving FTP Problems
You can improve FTP performance for users who transfer large files from systems
that are not running TCP/IP Services to a host running the TCP/IP Services
software.
15.2.1 Performance
Large file transfers can affect file transfer performance. A file transfer consists of
the following events:
1. FTP calls RMS to create the file.
2. RMS creates the file with the system’s default for number of blocks to be
allocated (FTP_FILE_ALQ value).
3. If the file being copied is larger than the space originally allocated, RMS
extends the space by adding blocks of memory space.
4. The number of extension blocks is determined by the system’s RMS default
extension quantity (FTP_FILE_DEQ value). For more information about
RMS, refer to the OpenVMS Record Management Services Reference Manual.
Performance is affected by the RMS overhead taken up by the file extension
process. One way to improve performance is to reset the appropriate parameters.
To do this, redefine the FTP logical names that:
• Reset buffer sizes
• Preallocate disk blocks
15–6 Configuring and Managing FTP