We are running a RDUT parallel sysplex version and it is running under VM. I have allocated 8 processors in the devmap but when I logon to system and do D M=CPU command it shows only one processor. Is there any way I can assign more process to our system via VM?

Also  It take more time to logon to TSO session. Basically it hungs for a while after these two messages

ICH70001I APC0XD1  LAST ACCESS AT 12:39:56 ON WEDNESDAY, SEPTEMBER 18, 2013  
IKJ56455I APC0XD1 LOGON IN PROGRESS AT 13:23:01 ON SEPTEMBER 18, 2013        

Before displaying this below message there is a delay here. 

IKJ56951I NO BROADCAST MESSAGES

We try to silm down the TSO logon procedure but still we don't see much improvment and it was not case when we logon to our standalone RD&T environment,

When you run sysplex, you ipl z/VM and are thus actually defining all of your physical resources to the z/VM operating system.  z/VM then allocates resources to its various users and guests.  The default configuration out of the box from IBM allocates one virtual CPU and 4GB of virtual storage per guest z/OS system.  If you would like your z/OS guests to get more resources (CPU, memory, disk,) you must update the z/VM configuration by editing your z/VM user directory and activating it.  On the default system, this file is USER DIRECT.  If you've not configured z/VM previously, I suggest the following publication as a very good reference:

zVM: CP Planning and Administration - SC24-6178-03

Chapter 17 describes the User Directory.

Note, is not unusual to see z/OS ipl and run slower under z/VM as compared to ipling and running it natively.  Adding more resources, however, should help the situation.

RDzJohn

It may seem counter intuitive but lowering the zVM and z/OS memory and giving more memory to the Linux O/S will actually improve z/OS performance.  For example, I have 7GB in my Linux system and give 4GB to zVM and probably around 3GB of that 4GB to z/OS. What are your values?