| The LAN cards devoted to Virtual Partitions can be used for a variety of purposes just as they would on a non-vPar system. When users or applications in two different vPars communicate, it is over the LAN. There is not any special provision in vPars for communicating in normal operation. (There is, however, special system administration communication among vPars, such as synchronization of the Virtual Partition Database, that takes place in a special way.) When establishing a communication session between two vPars, even if they are on the same server, the LAN interfaces on both vPars are used. This includes telnet, ftp, and the Berkely "r" commands such as rlogin. The following example shows a telnet session among two vPars used in many examples throughout the book. vPar cable1 (hostname cvhdcon3) initiates a telnet session with vPar cable2 (hostname cvhdcon4) in this example: # hostname cvhdcon3 <-- start on cable1 # telnet cvhdcon4 <-- telnet to cable2 Trying... Connected to cvhdcon4. Escape character is '^]'. Local flow control on Telnet TERMINAL-SPEED option ON HP-UX cvhdcon4 B.11.11 U 9000/800 (tc) login: root Password: Please wait...checking for disk quotas (c)Copyright 1983-2000 Hewlett-Packard Co., All Rights Reserved. (c)Copyright 1979, 1980, 1983, 1985-1993 The Regents of the Univ. of Cal- ifornia (c)Copyright 1980, 1984, 1986 Novell, Inc. (c)Copyright 1986-1992 Sun Microsystems, Inc. (c)Copyright 1985, 1986, 1988 Massachusetts Institute of Technology (c)Copyright 1989-1993 The Open Software Foundation, Inc. (c)Copyright 1986 Digital Equipment Corp. (c)Copyright 1990 Motorola, Inc. (c)Copyright 1990, 1991, 1992 Cornell University (c)Copyright 1989-1991 The University of Maryland (c)Copyright 1988 Carnegie Mellon University (c)Copyright 1991-2000 Mentat Inc. (c)Copyright 1996 Morning Star Technologies, Inc. (c)Copyright 1996 Progressive Systems, Inc. (c)Copyright 1991-2000 Isogon Corporation, All Rights Reserved. RESTRICTED RIGHTS LEGEND Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set forth in sub-paragraph (c)(1)(ii) of the Rights in Technical Data and Computer Software clause in DFARS 252.227-7013. Hewlett-Packard Company 3000 Hanover Street Palo Alto, CA 94304 U.S.A. Rights for non-DOD U.S. Government Departments and Agencies are as set forth in FAR 52.227-19(c)(1,2). Value of TERM has been set to "hp". WARNING: YOU ARE SUPERUSER !! # hostname cvhdcon4 <-- connected to cable2 # You can use telnet, rlogin, or other such connection methods only if you have two networking cards in your system - one for each vPar. This is true for other functionality as well, such as the backups from a vPar to another vPar or system with a local tape drive, which require a network card on both systems. I consider one networking card devoted to each vPar a necessity. There is a substantial amount of networking background information in the remainder of the chapter. |