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SSH Tectia 
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    About This Document >>
    Installing SSH Tectia Server for IBM z/OS >>
        Preparing for Installation >>
            System Requirements
            Permission Requirements
            System Limit Requirements
            Directories and Datasets
        Upgrading Previously Installed Secure Shell Software >>
        Installing the SSH Tectia Server for IBM z/OS Software >>
        Removing the SSH Tectia Server for IBM z/OS Software
    Getting Started with SSH Tectia Server for IBM z/OS >>
    Configuring the Server >>
    Authentication >>
    System Administration >>
    File Transfer Using SFTP >>
    Secure File Transfer Using Transparent FTP Security >>
    Tunneling >>
    Troubleshooting SSH Tectia Server for IBM z/OS >>
    Man Pages and Default Configuration Files >>
    Log Messages >>

System Limit Requirements

Check the definitions in BPXPRMxx. The following guidelines are approximate and apply to both the server and the clients.

Tectia requires an address space size of at least 200 MB (MAXASSIZE).

Each concurrent connection typically needs 2 to 3 processes (MAXPROCSYS, MAXPROCUSER). The user limit may require adjusting if many concurrent connections are run under one user ID.

For each concurrent connection Tectia requires:

  • file descriptors (MAXFILEPROC)
  • TCP/IP sockets (MAXSOCKET for file system type INET)
  • AF_UNIX sockets (MAXSOCKET for file system type UDS)

The limits suggested in the z/OS UNIX System Services Planning book are typically adequate except maybe for AF_UNIX. Tectia uses 3 to 4 AF_UNIX sockets for each concurrent connection.

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