Load source placement rules for i5/OS logical partitions

You must properly place a disk unit within a system unit or expansion unit before you use the disk unit as the load source for an i5/OS® logical partition. The placement rules depend upon the server unit or expansion unit in which the load source is located and the I/O adapter (IOA) that controls the load source.

Note: The information provided does not replace the System Planning Tool (SPT). Use this information as a resource with the SPT output. Its purpose is to assist you in the load source placement for your i5/OS logical partitions. For more information on the SPT, see System Planning Tool.

The load source disk for an i5/OS logical partition must be placed as follows.

Table 1. Load source placement rules
Server or expansion unit	IOA	Disk slot
515	Imbedded controller	P3-D2, P3-D3, P3-D4
515	SCSI bus port 0 of Optional PCI storage IOA controlling P2 disk slots	P2-D2, P2-D3, P2-D4
520	Imbedded controller	P3-D2, P3-D3, P3-D4
520	SCSI bus port 0 of Optional PCI storage IOA controlling P2 disk slots	P2-D2, P2-D3, P2-D4
525	Imbedded controller	P3-D2, P3-D3, P3-D4
525	SCSI bus port 0 of Optional PCI storage IOA controlling P2 disk slots	P2-D2, P2-D3, P2-D4
550	Imbedded controller	P2-D2, P2-D3, P2-D4
550	SCSI bus port 0 of Optional PCI storage IOA controlling P3 disk slots	P3-D2, P3-D3, P3-D4
570	Imbedded controller	P3-D4, P3-D5, P3-D6
595	SCSI bus port 0 of any storage IOA to which a load source disk unit is connected in the base PCI-X expansion tower (9194)	D01, D02, D11, D12, D21, D22, D06, D07, D16, D17, D26, D27, D31, D32, D33, D34 of base PCI-X expansion tower (9194)
5074 or 5079	IOA controlling device board slot 3	D31, D32, D33, D34
	IOA controlling device board slot 1	D01, D02
	IOA controlling device board slot 2	D06, D07
5094 or 5294	SCSI bus port 0 of any storage IOA to which a load source disk unit is connected.	D01, D02, D11, D12, D21, D22, D06, D07, D16, D17, D26, D27, D31, D32, D33, D34
5095	IOA controlling device board slot 1	D01, D02, D03, D04
5095	IOA controlling device board slot 2	D07, D08, D09, D10
5786 or 5787	SCSI bus port 0 of any storage IOA to which a load source disk unit is connected	P1-D1, P1-D2, P1-D3 can contain the load source only if slot C3 contains a single SCSI (506E) repeater card that is connected to port 0 on a SCSI I/O Adapter (IOA) in the system unit but is not connected to slot C2. P1-D7, P1-D8, P1-D9 can contain the load source only if the SCSI repeater card in slot C2 is connected to port 0 on a SCSI IOA in the system unit. P2-D1, P2-D2, P2-D3 can contain the load source only if slot C4 contains a single SCSI (506E) repeater card that is connected to port 0 on a SCSI IOA in the system unit but is not connected to slot C5. P2-D7, P2-D8, P2-D9 can contain the load source only if the SCSI repeater card in slot C4 is connected to port 0 on a SCSI IOA in the system unit.
5790 or 5796	SCSI bus port 0 of any storage IOA to which a load source disk unit in a 5786 or 5787 expansion unit is connected	P1-D1, P1-D2, P1-D3 can contain the load source only if slot C3 contains a single SCSI (506E) repeater card that is connected to port 0 on a SCSI I/O Adapter (IOA) in the 5790 expansion unit but is not connected to slot C2. P1-D7, P1-D8, P1-D9 can contain the load source only if the SCSI repeater card in slot C2 is connected to port 0 on a SCSI IOA in the 5790 expansion unit. P2-D1, P2-D2, P2-D3 can contain the load source only if slot C4 contains a single SCSI (506E) repeater card that is connected to port 0 on a SCSI IOA in the 5790 expansion unit but is not connected to slot C5. P2-D7, P2-D8, P2-D9 can contain the load source only if the SCSI repeater card in slot C4 is connected to port 0 on a SCSI IOA in the 5790 expansion unit.

Read the following rules about load source placement for i5/OS logical partitions:

The load-source IOP or IOA must be specified when you create your logical partition.
Disk compression must be disabled for the load source disk.
Disk units must have at least 8 GB of usable capacity for i5/OS V5R3M0 or 17 GB of usable capacity for i5/OS V5R3M5 or later.
Disk mirroring requires two load source disk devices in valid load-source positions.
External disk units cannot be used (except for those located in a SAN or in an expansion unit).
Any disk IOP or IOAs that can attach to a system capable of having logical partitions can be used for additional storage capacity after the special requirements for the load-source disk are met.
Each logical partition has its own single-level storage and hence its own ASP configuration. The ASP configuration rules that apply to systems without logical partitions also apply to logical partitions.
Disk protection can be defined for a partition in the same way as for a nonpartitioned system: parity protection (RAID), mirroring, or mixed. Bus-level mirroring requires two buses in the partition. IOP-level partitioning requires two disk IOPs in the partition.
Disk units that are already in use by a logical partition cannot be easily added to a different logical partition. You must first remove them from the configuration of the partition that is using the disk units before you add them to a different partition. In doing this, the system automatically moves any user or system data to other disk units in the same ASP.
For a 5094 or 5294, you can attach load source disk units to a maximum of six storage IOAs. Also, a 5094 or 5294 can have load source disk units for up to six i5/OS logical partitions.