System information

20 Sharing and maintaining SLES 10 SP2 Linux under z/VM
11Bx Read-write machines are cloned from this series of minidisks. These
minidisks were populated and updated from S10RWMNT.
21Bx Read-only machines are linking these minidisks as RR. Consider this the
production binaries for shared-root.
1.5 Building a read-write maintenance system
Before building a read-only root system, a system for maintaining and cloning a conventional
read-write Linux system is described. The read-write system is created with a maintenance
plan in mind. The read-write system is shown in the boxes shown above the dashed line in
Figure 1-1 on page 4.
Following are the steps to create the read-write system:
1. “Creating z/VM user IDs”
2. “Populating CMS disks on CMSCLONE” on page 24
3. “Installing SLES 10 SP2 Linux” on page 26
4. “Copying Linux from S10RWMNT to S10RWTST” on page 33
5. “Customizing and testing Linux on S10RWTST” on page 34
6. “Copying Linux from S10RWTST to S10RWMNT” on page 38
7. “Copying read-write Linux to the gold disks” on page 39
8. “Cloning a read-write Linux system” on page 40
When the read-write system is tested and working, the second phase is to create a read-only
root system.
1.5.1 Creating z/VM user IDs
Five z/VM user IDs are defined: CMSCLONE, LNXCLONE, S10RWMNT, S10RWTST and S10GOLD.
Disk planning
A read-write system occupies 5008 cylinders, or half of a 3390-9. A read-only system
requires 1669 cylinders, or half of a 3390-3.
Four 3390-9s and one 3390-3 are reserved for this environment. The first three 3390-9s are
planned as shown in Figure 1-11 on page 21.
The read-write maintenance system, S10RWMNT, and the read-write test system, S10RWTST
share a 3390-9. The S10GOLD system is requires an entire 3390-9. The reference system of
read-only clones, S10ROGLD, is given half of a 3390-9 and the first read-write system, LNX226 is
given the other half.
CMSCLONE is given 130 cylinders for two small CMS minidisks and LNXCLONE is given the
remaining cylinders on that 3390-3.