Information Technology Reference
In-Depth Information
As the whole operation is happening on the same CentOS operating system a
special PDS feature is used to produce the new Level 1C product to be tested and
compared to the original one.
This procedure is known as the AIP transforming module developed at IBM
Haifa and implemented by the ESA-ACS staff. It allows to create and retrieve a
Level 1C product on demand overtaking the original approach which was based on
the simple ability for the user to download both Level 1B and processor and create
locally the Level 1C product.
The on-demand generated data was successfully compared with the original one
by the Linux
diff
program.
20.5.2.6 Testbed Update Procedure Case 2 - New Operating System
In order to simulate a change in environment, we have created a demonstration case
in which we have supposed that the LINUX operating system is becoming obsolete
and so there is the need to migrate to the more used SUN SOLARIS. After the
notification of the need to switch to a SUN SOLARIS operating system, CASPAR
has to allow the L1C creation on the new platform.
The L1B->L1C processor creation and ingestion for SUN SOLARIS 5.7 was
performed by using the same steps used in the previous example, that is retriev-
ing, compiling and ingesting the new executable. For this case, the Representation
Information knowledge tree has included an emulation system based on two open
source OS emulators. For every emulator both the executable and the source code
are available and browsable by means of CASPAR.
The validation tests were successfully performed in the following environments:
•
VMware
Emulator: emulates
Open Solaris
and
Ubuntu
. Characteristics:
VMware emulates the OS, including its kernel, libraries and the user interface.
The processor architecture is not changed: does not change from 32 to 64 bits and
doesn't swap from big-endian to little-endian. The VMware Server can be down-
loaded from CASPAR as an executable or can be rebuilt from CASPAR through
source code in order to be run on another processor.
•
QEMU Emulator
. It emulates a Solaris 5.10 with a T1000 architecture, Sparc. It
emulates the OS with external kernel, libraries and is able to emulate the proces-
sor architecture. To be underlined that if the processor architecture is emulated the
QEMU software is really slow in performances. QEMU is available directly from
CASPAR as an executable or can be rebuilt from CASPAR through its source
code in order to be run on another processor.
•
SOLARIS T1000 Sparc
. This second workstation was provided in order to
perform the validation process on a not emulated Solaris environment.
The validation objective was to assist the system administrator to perform the
processor update for all the above mentioned environments. By using the proper
