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Chapter 4. Installing and configuring z/VM 51

It is recommended that you add at least three paging volumes, giving you a total of four (or

one more 3390-9). Having adequate paging space will give you plenty of

headroom to add

more Linux virtual machines. A rule of thumb for the amount of paging space is to have twice

as much as the total of all memory for all running Linux user IDs combined.

4.6.1 Formatting the paging volumes

Before adding paging volumes to the system, the DASD volumes to be used for minidisk

space (PERM) and paging space (PAGE) must be formatted. Normally this is done one

volume at a time using the CPFMTXA command. If you have just a few volumes, that is fine,

but when you have many volumes to format, the process of running CPFMTXA can become

time consuming and tedious, which can lead to errors.

Therefore, a REXX EXEC named CPFORMAT has been provided to allow you to format many

volumes with a single command. The source code for “The CPFORMAT EXEC can be

downloaded at:

http://www.vm.ibm.com/devpages/mikemac/SG247932.tgz

It is a wrapper around CPFMTXA. To use this EXEC, each DASD to be formatted must first be

attached with the virtual device address—the same real device address (using ATTACH

realDev *).

This EXEC will label the volumes according to the convention described in 2.2.1, “Volume

labeling convention” on page 9. If you want different volume labels, you can use the

CPFMTXA command and manually specify each volume label, or you can modify the REXX

EXEC.

Getting the CPFORMAT EXEC to z/VM

Perform the following steps:

1. Log off of MAINT so you will be able to get the MAINT 191 disk in read-write mode using

FTP.

2. Start an SSH (putty) session to the NFS server and change to the vm/ directory, which

was created when you extracted the files associated with this book. Verify that the file

CPFORMAT.EXEC exists:

# cd /nfs/virt-cookbook-RH6/vm

# ls cpformat*

cpformat.exec

3. Start an FTP session to z/VM. If you get a reply from the FTP server, it shows that you

correctly configured it on the z/VM TCPMAINT user ID. Issue the PUT subcommand to

copy the file.

# ftp 9.60.18.249

Name (9.12.5.22:root): maint

331-Password: maint

230-MAINT logged in; working directory = MAINT 191

...

ftp> put cpformat.exec

Important: At this point, you need access to the NFS server described in Chapter 6,

“Configuring an NFS/FTP server” on page 97 to get the files CPFORMAT EXEC. If you did

not complete that chapter, it is necessary to do so to proceed.

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Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Pagina 71

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