Logical partition requirements for alternate IPL devices

After partitions are defined, the Licensed Internal Code and operating system must be loaded from either optical or tape to the load source disk unit for the logical partition.

During partition setup, you must select which I/O processor (IOP) connects to the alternate Initial Program Load (IPL) device (either tape device or optical device).

An IBM^® external tape device, or equivalent, that is attached to an IOA that supports alternate IPL, and can be attached to a system on which you can create partitions, can be used as a alternate IPL device. There is no support for external CD-ROM devices on 6xx, 7xx, Sxx systems. For 8xx servers, you can attach a 7210 external CD-ROM to a 2768.

Note: When attaching an external CD-ROM as an alternate IPL device, it must be at hardware Unit Address 5, Unit Address 6, or Unit Address 7. The following table shows the translation from SCSI to hardware Unit Addresses.

Table 1. SCSI to Unit Address conversion
SCSI Address	Unit Address
2	5
1	6
0	7

IOP considerations

IOP considerations are as follows:

If you want to support both optical and tape devices with a single SPD IOP, it must be a 2624, which supports only 6380 and 6390 internal tape devices.
The 2624 IOP does not support optical or tape devices in the SPD Integrated Expansion Unit 9364 and 9331 (servers 620 and 720), or 5064 and 9331 (servers S20 and 720).
Only servers 650, 740, S40 support switching internal primary partition alternate IPL devices (optical devices and tape devices) to secondary partitions.

The following are requirements for alternate IPL devices:

Rules for an alternate IPL IOP on a secondary partition
Rules for an internal alternate IPL device on a secondary partition
Other rules relating to the alternate IPL device

The LPAR Validation Tool (LVT) Link outside Information Center , as well as the System Handbook, show the internal tape alternate IPL devices that are supported by logical partitions based on the server ordered.

The following table shows the internal CD-ROM alternate IPL devices that are supported by logical partitions.

Table 2. Supported internal CD-ROM devices
Internal optical device feature code	810, 820, 825, 870, 890	830/840 5065/5066 5074/5079	620/720/S20	All Other Systems
6325				X
6425			X
6005		X
4525	X

Rules for secondary partition alternate IPL IOP

Hardware requirements allow only certain IOPs to be used as the alternate IPL IOP in a secondary partition. Some of these IOPs must be in specific card positions in their expansions units. The IOP, specified during partition setup, must be one of the following:

Table 3. Placement for a SPD alternate IPL IOP
SPD IOPs	Description	5072/5073 card position	5064/9364 card position
2621	Removable media device attach	any	any
2624	Storage device controller	3	S02
2644	34xx Magnetic Tape Attachment	any	any
6501	Tape or disk device controller	any	any
6513	Internal tape device controller	3	S02
6534	Magnetic media controller	any	any

Table 4. Placement for a PCI alternate IPL IOP in 5064/9364, 5065/5066
PCI IOP	Description
2809, 2824	PCI WAN/LAN workstation IOP Note: Even though its description does not say so, 2809 or 2824 also supports CD-ROM and tape with one of the following I/O adapters (IOAs):
	PCI IOA	Description	5064/9364 IOP/IOA card positions	5065/5066 IOP/IOA card positions
	2726, 2768	PCI RAID Disk Unit Controller	E15/E16	N/A
	2729	PCI Magnetic Media Controller	E10/E11 or E05/E06	C3/C4 ¹ or C8/C9 ¹ or C13/C14 ¹
	2741	PCI RAID Disk Unit Controller	E15/E16	N/A
	2748	PCI RAID Disk Unit Controller	E15/E16	C3/C4 ²
Notes: External tape attach only CD-ROM or internal tape attach only

Table 5. Placement for a PCI alternate IPL IOP in 8xx, 5074, 5075, 5079
PCI IOP	Description
2843, 2844, 284C, 284B, 9943	PCI WAN/LAN Workstation IOP Note: 284C is only supported on server 820. 284B is only supported in the 5075. All other servers and expansion units can use either the 2843, 2844, or 9943.
	PCI IOA	8xx, 5074, 5075, 5079 card positions
	2749	Any IOA slot
	2757	Any IOA slot
	2768	Any IOA slot
	2778	Any IOA slot
	2782	Any IOA slot
	4748	Any IOA slot
	4778	Any IOA slot
	5702	Any IOA slot
	5703	Any IOA slot

Rules for secondary partition internal alternate IPL devices

The alternate IPL device is in the same expansion unit as its controlling IOP. It must be placed as follows:

Table 6. Placement for an internal alternate IPL device
Expansion unit	Removable media slot
5072, 5073, 5077	D01, D02, or D03
5064/9364, 5034, 5035	D12 or D13 ¹
5065, 5066, 5074, 5079	D41 or D42
9251	D03 or D04 ²
Notes: Models 620/720/S20 only Models 650/740/S40 only

Internal removable media devices are:

Quarter-inch cartridge (QIC) 1/4-Inch tape
8 mm tape
CD-ROM

Other rules for secondary partition alternate IPL

The alternate IPL device must be connected to SCSI bus 0.
The alternate IPL IOP is specified during partition setup.
If the alternate IPL IOP is attached to 2624 (SPD), the following applies:
- QIC 1/4-inch tape must be 6380 or 6390
- 2624 does not support tape or CD-ROM in SPD expansion unit 5064/9364 (models 620/720/S20).
CD-ROM devices are not supported on 6513 (SPD)
2726, 2741, 2757, 2782, 5702, and 5703 also support disk devices. These IOAs should not be used to attach removable media that will be switched between partitions if disk devices are also attached.

Information about all supported internal tape and CD-ROM features and the IOPs to which they must be attached can be found in the LVT, and in the System Handbook.