IBM s/390 manual File ownership, Minor problems

The ckdconvaws command converts the AWSCKD format to the FLEX-ES format, and writes to the Linux file indicated.12 The volume being unzipped is a 3390-3 (and we must tell the ckdconvaws program this). The second operand, /s390/OS39RA, is the target location for the Linux file that will emulate the S/390 volume. Your disk layout may be different, and you need to adjust this path and name as required for your system.

The nnn and mmm numbers shown will increment as the program runs. When the volume is finished, use the root window to issue the command:

$	cd /	(in	the	flexes window)
#	umount /mnt/cdrom	(in	the	root window)

3390-3 volumes are held in two files in the original AWSCKD format. Both these files are usually placed in the same zip file. The ckdconvaws program handles this transition automatically.

We can pipe directly from the unzip program to the ckdconvaws program only if the emulated volume will be held in a single file, as we are doing here. If the volume will be held in several files, a named pipe must be used. This is more common with UnixWare or Open UNIX systems and is described in the Netfinity/EFS redbook.

Load the other CDs

Repeat the same process (mount, unzip/convert, umount) for the other CDs that are to be loaded. For the OS/390 R10 system, we used the following:

CD	CD File	Linux File	Disk Model
2	/mnt/cdrom/os390/os3raa.zip	/s390/OS3RAA	3390-3
3	/mnt/cdrom/os390/os39M1.zip	/s390/OS39M1	3390-3
4	/mnt/cdrom/os390/os39ha.zip	/s390/OS39HA	3390-3

3.3 File ownership

All of the files containing emulated S/390 volumes must be owned by userid flexes and groupid flexes. You can verify this, as follows:

# ls -al /s390		(check the			owner and group names)
# ls -al /s391		(if	you	have a second disk)
(if you	need to change ownership, do the following)
# su		(change		to	root, if not already root)
# chown	flexes:flexes /s390/OS39RA	(or	whatever file needs to be changed)

The “flexes:flexes” parameter format causes both the owner and the group name to be changed.

3.4 Minor problems

While working with various AD releases, we found two unusual situations.

12 The -r option indicates that ckdconvaws should create the output file, if it does not already exist.

Chapter 3. FLEX-ES and OS/390 installation 25