In addition to the regular JESx DD statements, the job log of a running holder address space contains the DD names MAINTASK and SYSTSPRT.
DD MAINTASK shows if the data space was created correctly and the SVC routine installed. The holder address space TAURHLD initializes correctly when HLD0002I is the last message.
HLD0001I 10:47:41.757 zServer holder task 02030000 startup
HLD0009I 10:47:41.876 TSO-Environment successful created
A(Command-Processor-Parameter-List) : 008D1CD0
HLD0078I 10:47:41.893 Read of NT-Pair E9E2D9E500F961004040404040404040 ended with RC 00000004 (hex).
ZCF0058I ========================================================================
Completing configuration TAURISPF
========================================================================
ZCF0024W 10:47:42.138 Server is limited server due to specification of TSOE_STCID
ZCF0025W 10:47:42.138 The following configuration parameters are not used due to specification of TSOE_STCID
TSOE_CLEANUP
TSOE_JOBPREFIX
TSOE_JOBSEARCH
ZCF0058I ========================================================================
Completing configuration IVPUSR
========================================================================
ZCF0024W 10:47:42.139 Server is limited server due to specification of TSOE_STCID
ZCF0025W 10:47:42.139 The following configuration parameters are not used due to specification of TSOE_STCID
TSOE_CLEANUP
TSOE_JOBPREFIX
TSOE_JOBSEARCH
HLD0069I 10:47:42.140 Holder task configuration
Size data space specified....: 262144 Blocks
Size data space required.....: 165 Blocks
Delay .......................: 500 seconds
Trace level..................: 0
Modify limit.................: 1
Size RESTAB in blocks........: 160
Max. # of entries in RESTAB..: 5120
Reply........................: YES
HLD0018I -----------------------------------------------------------------------
Installing User-SVC 0238
-----------------------------------------------------------------------
HLD0019I 10:47:42.153 User-SVC 0238 successfully installed.
Pgm : TAURAUTH EpAddr : 9CB5EDF0
HLD0021I -----------------------------------------------------------------------
Creating Common-Dataspace TAURSERV
-----------------------------------------------------------------------
HLD0003I 10:47:42.153 Creating Dataspace
Dataspace-Name : TAURSERV
Dataspace-Size : 262144 Blocks
Dataspace-StgKey : 90
HLD0025I 10:47:42.155 Function Create Dataspace ended successful
HLD0025I 10:47:42.155 Function Create Alet ended successful
HLD0025I 10:47:42.155 Function Create Name/Token ended successful
HLD0004I 10:47:42.156 Writing Name/Token-Pair TAURSERV
DSPALET : 01FF001B
DSPORIGIN : 00000000
DSPBLOCK : 00040000
DSPFLAGS : 00000000
HLD0033I 10:47:42.156 Server Information
Lowest port over all Servers : 1200
Highest port over all Servers : 1249
Maximum numbers of Servers : 1
HLD0035I 10:47:42.157 Initializing data space for user administration
HLD0076I 10:47:42.158 Resource table size increased to 5120 entries
HLD0048I -----------------------------------------------------------------------
Starting Server
-----------------------------------------------------------------------
HLD0049I 10:47:42.200 Starting server TAURISPF
HLD0002I 10:47:42.208 zServer holder task ready for commands