352 IBM z13s Technical Guide
The MCI contains the base capacity, the On/Off CoD, and the CBU. The MPCI and the model
permanent capacity rating (MPCR) contain the base capacity of the system, and the MTCI
and model temporary capacity rating (MTCR) contain the base capacity and the On/Off CoD.
Store CPU ID instruction
The STIDP instruction provides information about the processor type, serial number, and
LPAR identifier, as shown in Table 8-3. The LPAR identifier field is a full byte to support
greater than 15 LPARs.
Table 8-3 STIDP output for z13s servers
When issued from an OS running as a guest under z/VM, the result depends on whether the
SET CPUID command was used:
Without the use of the SET CPUID command, bits 0 - 7 are set to FF by z/VM. However, the
remaining bits are unchanged, which means that they are the same as they are without
running as a z/VM guest.
If the SET CPUID command was issued, bits 0 - 7 are set to FF by z/VM, and bits 8 - 31 are
set to the value entered in the SET CPUID command. Bits 32 - 63 are the same as they are
without running as a z/VM guest.
Table 8-4 lists the possible output returned to the issuing program for an OS running as a
guest under z/VM.
Table 8-4 IBM z/VM guest STIDP output for z13s servers
Planning for nondisruptive upgrades
Online permanent upgrades, On/Off CoD, CBU, and CPE can be used to concurrently
upgrade a z13s server. However, certain situations require a disruptive task to enable the new
capacity that was recently added to the CPC. Several of these situations can be avoided if
Description Version
code
CPU ID number Machine
type
number
LPAR two-digit
indicator
Bit position 0 - 7 8 - 15 16 - 31 32 - 48 48 - 63
Value x00
a
a. The version code for z13s servers is x00.
LPAR ID
b
b. The LPAR ID is a two-digit number in the range of 00 - 3F. It is assigned by the user on the
image profile through the Support Element or HMC.
Six-digit number
derived from the CPC
serial number
x2965 x8000
c
c. High order bit on indicates that the LPAR ID value returned in bits 8 - 15 is a two-digit value.
Description Version
code
CPU identification number Machine
type
number
LPAR two-digit
indicator
Bit position 0 - 7 8 - 15 16 - 31 32 - 48 48 - 63
Without
SET CPUID
command
xFF LPAR ID 4-digit number
derived from the CPC
serial number
x2965 x8000
With
SET CPUID
command
xFF 6-digit number as entered by the
SET CPUID = nnnnnn command
x2965 x8000
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