Alternate restart device placement rules for i5/OS logical partitions

After partitions are defined, the Licensed Internal Code and i5/OS^® must be loaded from either optical or tape media to the load source disk unit for the logical partition. During partition setup, you must select which I/O processor (IOP) or I/O adapter (IOA) controls the alternate restart device (either tape device or optical device). An IBM^® external tape device or optical device that is attached to an IOA that supports alternate restart device can be attached to a system and used as an alternate restart device also.

Note: The information provided does not replace the LPAR Validation Tool (LVT). Use this information as a resource with the LVT output. Its purpose is to assist you in the alternate restart device placement for your i5/OS logical partitions. For more information on the LVT, see LPAR Validation Tool (LVT).

SCSI-to-unit-address conversion

Note: When attaching an external SCSI device as an alternate restart device, it must be at hardware unit address 5, 6, or 7. The following table shows the translation from SCSI to hardware unit addresses.

SCSI address	Unit address
2	5
1	6
0	7

Supported internal CD-ROM and DVD-ROM devices

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

Internal optical device feature code	520 and 570	550	595	5074, 5079, 5094, 5294, 5786, 5787, 5790, and 9194
2640	X	X
4625			X	X
4630			X	X
4631			X	X
4633			X	X
5751	X	X

i5/OS hardware requirements allow only certain IOPs to be used as the alternate restart IOP. Some of these IOPs must be in specific card slots in the expansions units. The IOP, specified during partition setup, must be in one of the following card slots.

PCI IOP	PCI IOA	5074, 5079, 5094, 5294, 5786, 5787, 5790, and 9194
2843 and 2844 PCI WAN/LAN Workstation IOP	2749	Any IOA slot
	2757	Any IOA slot
	2768	Any IOA slot
	2780	Any IOA slot
	4748	Any IOA slot
	4778	Any IOA slot
	5702	Any IOA slot
	5703	Any IOA slot

Placement for an internal alternate restart device

The alternate restart device is in the same expansion unit as its controlling IOP or IOA. It must be placed as follows.

Expansion unit	Removable media slot
5074, 5079, 5094, 5294, 5786, 5787, 5790, and 9194	D41 or D42

The alternate restart device for an i5/OS logical partition in the system unit must be placed as follows:

Server	IOA	Removable media slot
520	Imbedded controller	P4-D1 or P4-D2
550	Imbedded controller	P4-D1 or P4-D2
570	Imbedded controller	P4-D1
595	Any valid IOA in the connected base PCI-X expansion unit (9194)	Any valid removable media slot in the connected base PCI-X expansion unit (9194)

Internal removable media devices are:

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

i5/OS logical partitions have a few more rules for alternate restart devices:

The alternate restart device must be connected to SCSI bus 0.
The alternate restart IOP or IOA is specified during partition setup.
IOAs 2757, 2780, 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.