Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Scaricare il pdf (Pagina 78)

58 z/VM and Linux on IBM System z: The Virtualization Cookbook for Red Hat Enterprise Linux 6.0

Now search for all the gaps using the ALL subcommand. You should see some gaps:

====> all /gap

0 500 501 GAP

-------------------- 6 line(s) not displayed --------------------

0 0 1 GAP

-------------------- 216 line(s) not displayed --------------------

0 0 1 GAP

-------------------- 86 line(s) not displayed --------------------

Type all with no argument again to get out of this mode:

====> all

Three gaps should be listed on the right side:

– 501 cylinders on the $$$$$$ volume

– 1 cylinder on the $$$LNX volume

– 1 cylinder on volume used for LNXMAINT 191 and 192 disks (UM6289 in this example)

You do not have to worry about the first two gaps because they are expected, given the

layout of the default USER DIRECT file. To avoid a 1-cylinder gap being reported on each

user volume, we recommend to use the user ID $ALLOC$. This user is set to NOLOG,

which means it can never be logged onto. Thus it is not a conventional user ID. Rather, it

is a convenient place to put dummy minidisk definitions for cylinder 0 of all PERM

volumes.

5. Get out of the file USER DISKMAP with the QUIT command or by pressing F3.

6. Edit the USER DIRECT file again and add a new minidisk definition at virtual address A04 for

the first cylinder of the DASD you added (the label is UM6289 in this example):

==> x user direct

====> /user $alloc

USER $ALLOC$ NOLOG

MDISK A01 3390 000 001 610RES R

MDISK A02 3390 000 001 UV6283 R

MDISK A03 3390 000 001 UV6284 R

MDISK A04 3390 000 001 UM6289 R

7. Save your changes with the FILE subcommand and run DISKMAP again. Edit the USER

DISKMAP file. This time you should see just two gaps for volumes with labels $$$$$$ and

$$$LNX. If you search for the $ALLOC$ user ID, you should see the disk map of the

volume you added for LNXMAINT:

==> diskmap user

The minidisks with the END option specified in this directory will not be

includ

ed in the following DISKMAP file.

File USER DISKMAP A has been created.

==> x user diskmap

====> prefix off

====> all /gap

0 500 501 GAP

-------------------- 6 line(s) not displayed --------------------

0 0 1 GAP

-------------------- 303 line(s) not displayed --------------------

8. When you are done you can quit by pressing F3.

====> F3

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 295 296

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Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Pagina 78

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