Using direct mount

The root file system should be set up so that it does not require frequent changes or updates outside of SMP/E maintenance. To achieve this, we will allocate an intermediate file system called OMVS.USERS and mount it at /u.

All user directories that are added will reside in this new file system and not in the root file system.

Example: Following is a sample JCL to allocate the intermediate file system. Change the JCL to fit your environment.

//USERIDA JOB ,'Compatibility Mode',                            
//        CLASS=A,MSGCLASS=X,MSGLEVEL=(1,1)                     
//DEFINE EXEC PGM=IDCAMS                                        
//SYSPRINT DD SYSOUT=H                                          
//SYSUDUMP DD SYSOUT=H                                          
//AMSDUMP  DD SYSOUT=H                                          
//DASD0    DD DISP=OLD,UNIT=3390,VOL=SER=ZFSVOL                 
//SYSIN    DD *                                                 
     DEFINE CLUSTER (NAME(OMVS.USERS) -                         
            VOLUMES(ZFSVOL) -                                   
            LINEAR CYLINDERS(5 1) SHAREOPTIONS(3))              
/*                                                              
//CREATE EXEC PGM=IOEAGFMT,REGION=0M,                           
// PARM=('-aggregate OMVS.USERS -compat -owner 11 -perms o755') 
//SYSPRINT DD SYSOUT=H                                          
//STDOUT DD SYSOUT=H                                            
//STDERR DD SYSOUT=H                                            
//SYSUDUMP DD SYSOUT=H                                          
//CEEDUMP DD SYSOUT=H                                           
...

The next thing to do is mount this new intermediate file system at /u. The mount can be performed from an ID that has superuser authority by:

Using the usr/sbin/mount REXX exec from the shell
Using the TSO MOUNT command
Using the mount shell command
Using the ISHELL File_Systems pull-down
Adding an entry to the BPXPRMxx member in SYS1.PARMLIB so that it will be mounted when the system reIPLs.

An example of the commands required, including issuing the mount command from the shell is shown in Figure 1. Type OMVS from ISPF option 6 to enter the shell. Then execute the highlighted commands to mount the file system OMVS.USERS. In Figure 1, the user ID is ADMIN and it has superuser authority.

Figure 1. Mounting the new intermediate file system. This figure shows an example of the process to mount thef file system OMVS.USERS.

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 - - - - - - - - - - - - - - - - - - - - - - - - - - -
 - Improve performance by preventing the propagation -
 - of TSO/E or ISPF STEPLIBs                         -
 - - - - - - - - - - - - - - - - - - - - - - - - - - -
# /usr/sbin/mount /u omvs.users           1 
OMVS.USERS is now mounted at
/u
# df -P                          2 
Filesystem     512-blocks        Used  Available  Capacity Mounted
OMVS.USERS          7200          40       7160        1% /u
OMVS.ROOT          82800       79608       3192       97% /
# chmod 755 /u                   3 

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ESC=¢ 1=Help    2=SubCmd 3=HlpRetrn  4=Top      5=Bottom   6=TSO
      7=BackScr 8=Scroll 9=NextSess 10=Refresh 11=FwdRetr 12=Retrieve

1 Use the mount command to mount the file system, OMVS.USERS, on mount point /u.
2 Run the display free space command to display the mounted file systems.
3 Change the permission bits to allow access to /u.

Now that the OMVS.USERS file system is mounted at mount point /u you can create the user1 mount point from a superuser ID by using:

The mkdir command in the shell
The TSO/E MKDIR command
The ISHELL Directory pull-down

Figure 2 shows the sequence of commands performed by a superuser in the shell to create a mount point for a new user off /u. Before you begin, be sure that the new user is defined to the OMVS segment that your security product uses. Type in OMVS from ISPF option 6 to enter the shell and execute the highlighted commands to create the mount point for user1.

Figure 2. Creating a mount point directory for a user. This figure shows how to create a mount point for a new user.

# cd /u                           1 
# pwd                             2 
/u                                3 
# mkdir -m 700 user1              4 
#ls -l       5 
total 16
drwx------   2 ADMIN   OMVSGRP        0 Nov  7 09:07 user1 6 
#
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ESC=¢ 1=Help    2=SubCmd 3=HlpRetrn  4=Top      5=Bottom   6=TSO
      7=BackScr 8=Scroll 9=NextSess 10=Refresh 11=FwdRetr 12=Retrieve

1 Change to make /u your current working directory.
2 Check to make sure /u is the current working directory.
3 /u is the current working directory.
4 Create a new directory for user1 setting the permission bits to 700. See Controlling access to files and directories for information about permission bit settings.
5 List the contents of the /u directory.
6 The user1 directory entry.

The user file system that was previously created can now be mounted at /u/user1. The mount can be performed by:

Using the /usr/sbin/mount REXX exec from the shell
Using the TSO/E MOUNT command
Using the ISHELL File_systems pull-down
Adding an entry to the BPXPRMxx member in SYS1.PARMLIB so that it is remounted when the system reIPLs.

Figure 3 shows an example of the commands required, including issuing the mount command from the shell. Type OMVS from ISPF option 6 to enter the shell and execute the highlighted commands to mount the file system OMVS.USER1.

Figure 3. Mounting the new file system. The sequence of commands needed to mount the file system OMVS.USER1

# /usr/sbin/mount /u/user1 omvs.user1   1 
OMVS.USER1 is now mounted at
/u/user1
# df -P                                2 
Filesystem     512-blocks        Used  Available  Capacity Mounted
OMVS.USER1          12960          40      12920        1% /u/user1
OMVS.ROOT           82800       79608       3192       97% /
# chown user1:grpoe /u/user1         3 
# ls -l /u/user1                      4 
total 16
drwx------   2 USER1   GRPOE        0 Nov  7 09:09 user1
#

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ESC=¢ 1=Help    2=SubCmd 3=HlpRetrn  4=Top      5=Bottom   6=TSO
      7=BackScr 8=Scroll 9=NextSess 10=Refresh 11=FwdRetr 12=Retrieve

1 Issue the mount command to mount the file system, OMVS.USER1, on mount point /u/user1.
2 Run the display free space command to display the mounted file systems.
3 In order for USER1 to use this new file system, you must issue the chown command to change the ownership and to change the group to the user's default group. Issue this command to set the owner and group fields of this mount point directory for the USER1 ID. You only need to issue the chown command once because the values will be saved in the new file system and will be reused even when the file system is remounted later.
4 Issue a list command to display the new directory for USER1.

To make the mounting of the OMVS.USERS and OMVS.USER1 file systems permanent, add an entry in the BPXPRMxx member in SYS1.PARMLIB. These two mount statements must follow the ROOT statement for the root file system.

MOUNT    FILESYSTEM('OMVS.USERS')
         TYPE(ZFS)
         MOUNTPOINT('/u')
         MODE(RDWR)

 MOUNT   FILESYSTEM('OMVS.USER1')
         TYPE(ZFS)
         MOUNTPOINT('/u/user1')
         MODE(RDWR)