Specifications

Escala Tower PL & S, E, T System Hardware
Chapter 2: Models Description 69/94
9es3s1c2.doc
Rev 5.9
02/12/2003
11.6. Logical Partitioning (LPAR)
Static LPAR is supported with AIX V5.1 or V5.2. Dynamic LPAR requires AIX V5.2.
The PL420T can be divided into up to 3 logical partitions. System resources can be dedicated to each
LPAR.
A minimum of one processor is required per LPAR.
A partition must have at least a SCSI and Ethernet adapter/controller. Note that the integrated internal
SCSI bus and the integrated external SCSI bus must be assigned to the same partition.
All the internal disk drives and media must be assigned to the same partition.
External disk drives must be provided for all but the first partition. AIX does not support diskless
LPAR operation.
When running LPAR with AIX V5.1, fully populated processor cards cannot mix memory DIMMs
with different capacities on the same card.
11.6.1. Virtual Console Devices for Each Partition
For each partition running on the server, one virtual tty is provided as a substitute to using a physical
console. This tty runs through the RS232 connection between the HMC and the service processor (and
therefore is isolated from the network), and can be used as a normal tty console. Console messages
from AIX are streamed to the output window in the HMC. The HMC also provides virtual operator
panel functions for each partition, including a display of the firmware and AIX progress and error
codes that would normally appear on the LCD display on the front of the server.
11.6.2. Install Media Devices
If there is only one installation device (for example, a CD-ROM or tape) available in a system, it
should not be connected under the same SCSI adapter as boot disks or other disks critical to that
partition’s operation. Doing so would limit the ability to reconfigure that installation device to be used
by different partitions. Instead, the device should be connected to its own SCSI adapter so that it can
be independently allocated to any partition when required.
11.6.3. Boot Devices
Each partition requires its own separate boot device. This means the system must have at least one
boot device and associated adapter per partition.