Limitations for running i5/OS on IBM System p5 and eServer p5 servers

There are several limitations for running i5/OS^® on IBM System p5™ and eServer™ p5 servers. They include limitations to server models, processors, and using resources of other logical partitions.

The following limitations apply to running i5/OS on IBM System p5 and eServer p5 servers:

Server models

The only IBM System p5 and eServer p5 server models that support i5/OS are the p5 570, p5 590, and p5 595 servers with 1.65 GHz processors and the p5 570 with 2.2 GHz processors.

Processors

You can run i5/OS on only one processor on a p5 570 server, and on only two processors on a p5 590 server or a p5 595 server. This limits the number of i5/OS logical partitions that you can create on these IBM System p5 and eServer p5 servers and the possible configurations of those i5/OS logical partitions. The following table lists the possible configurations of i5/OS on IBM System p5 and eServer p5 servers.

Server model	Possible i5/OS logical partition configurations
p5 570 servers	One logical partition that uses one dedicated processor. One logical partition that uses uncapped shared processing units, with a maximum of one virtual processor for the logical partition. Up to ten logical partitions that use capped shared processing units, with a minimum of 0.10 shared processing units for each logical partition, and the total number of shared processing units not to exceed 1.00 shared processing units.
p5 590 servers or p5 595 servers	One logical partition that uses one or two dedicated processors. Two logical partitions that use one dedicated processor each. One logical partition that uses uncapped shared processing units, with a maximum of two virtual processors for the logical partition. Two logical partitions that use uncapped shared processing units, with a maximum of one virtual processor for each logical partition. One logical partition that uses one dedicated processor and one logical partition that uses uncapped shared processing units, with a maximum of one virtual processor for the logical partition that uses uncapped shared processing units. One logical partition that uses one dedicated processor and from one to ten logical partitions that use capped shared processing units, with a minimum of 0.10 processing units for each logical partition that uses capped shared processing units, and the total number of capped shared processing units not to exceed 1.00 shared processing units. One logical partition that uses uncapped shared processors, with a maximum of one virtual processor for the logical partition that uses uncapped shared processing units, and from one to ten logical partitions that use capped shared processing units, with a minimum of 0.10 processing units for each logical partition that uses capped shared processing units, and the total number of capped shared processing units not to exceed 1.00 shared processing units. From one to twenty logical partitions that use capped shared processors, with a minimum of 0.10 shared processing units for each logical partition, and the total number of shared processing units not to exceed 2.00 shared processing units.

Server model

Possible i5/OS logical partition configurations

p5 570 servers

One logical partition that uses one dedicated processor.
One logical partition that uses uncapped shared processing units, with a maximum of one virtual processor for the logical partition.
Up to ten logical partitions that use capped shared processing units, with a minimum of 0.10 shared processing units for each logical partition, and the total number of shared processing units not to exceed 1.00 shared processing units.

p5 590 servers or p5 595 servers

One logical partition that uses one or two dedicated processors.
Two logical partitions that use one dedicated processor each.
One logical partition that uses uncapped shared processing units, with a maximum of two virtual processors for the logical partition.
Two logical partitions that use uncapped shared processing units, with a maximum of one virtual processor for each logical partition.
One logical partition that uses one dedicated processor and one logical partition that uses uncapped shared processing units, with a maximum of one virtual processor for the logical partition that uses uncapped shared processing units.
One logical partition that uses one dedicated processor and from one to ten logical partitions that use capped shared processing units, with a minimum of 0.10 processing units for each logical partition that uses capped shared processing units, and the total number of capped shared processing units not to exceed 1.00 shared processing units.
One logical partition that uses uncapped shared processors, with a maximum of one virtual processor for the logical partition that uses uncapped shared processing units, and from one to ten logical partitions that use capped shared processing units, with a minimum of 0.10 processing units for each logical partition that uses capped shared processing units, and the total number of capped shared processing units not to exceed 1.00 shared processing units.
From one to twenty logical partitions that use capped shared processors, with a minimum of 0.10 shared processing units for each logical partition, and the total number of shared processing units not to exceed 2.00 shared processing units.

Using resources of other logical partitions

i5/OS logical partitions on an IBM System p5 and eServer p5 server cannot use the I/O resources of a virtual I/O server logical partition, and other logical partitions cannot use the I/O resources of an i5/OS logical partition on an IBM System p5 and eServer p5 server.