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56 S/390 PID: ThinkPad Enabled for S/390
The tar function again took 12.6 minutes and the ftp function took less than one minute. We
used a private 100 Mpbs LAN connection, with no other active systems on it. The target
system (our Netfinity/EFS machine) was otherwise idle during this time. It would have been
faster to ftp /s390/OS39RA than to tar it, but we wanted the disk compression offered by
tar. We created the /s390/TP directory on the target system before we ran the script.
We elected to use a separate tar file for each volume. A single, combined tar file would be
very large and too unwieldy. We simply made more shell scripts; two for each S/390 volume
we wanted to back up.
We could, of course, take ADRDSSU backups (to FakeTape files) and then tar and ftp
these files. This might be the best solution, although it would require the most processing
and ThinkPad disk space.
There are clearly several ways to approach backup and restore for a ThinkPad/EFS system.
We cannot recommend any as the right way, and you will probably use a combination of
techniques. We strongly suggest that you take time to understand the options available, try
whatever is appropriate for you, and establish a routine for taking backups.
This discussion has not mentioned backing up the Server operating system. Ideally, we
should be able to capture the complete Server state in a form that can be restored by a
standalone boot program. The options are somewhat limited, since our ThinkPad/EFS
systems do not have tape drives or CD-RW drives. One option would be to completely
duplicate the primary ThinkPad hard disk contents onto another hard disk in the UltraBay. We
did not have time to explore this problem during this redbook project, but hope to address it in
a future project.
5.15.3 CD-RW drive
At least one of the base ThinkPads used for EFS systems has an optional CD-RW drive. This
obviously can be used for backup purposes, working from the Linux side and taking
full-volume backups. It would be necessary to compress the S/390 volume first, to fit on a
CD. Also, some disk staging may be necessary if two hard disks are used for EFS operation
and one of these must be removed to mount the CD-RW drive in the Ultrabay.
5.16 S/390 identification
The S/390 instruction STIDP stores an 8-byte field:
0APLSSSSIIII0000
||| | | +---> the four zeros are constants
||| | +-------> machine type (see notes below)
||| +-----------> arbitrary number set by manufacturer (serial number)
||+--------------> LPAR number
|+---------------> processor number
+----------------> the hex digits 0A are normally constants
The processor type field for an EFS system has one of these values:
1245 is the processor type for a system based on xSeries 430
1247 is the processor type for a system obtained through PID
1246 is for all other EFS systems
The SSSS field is normally set to a unique value for each license and functions as a CPU
serial number. The LPAR number is usually zero, but you can set it by a statement in the
system definitions. The processor number corresponds to one of the processor numbers in
your system definitions. For a single processor, this is normally zero.