I take it you've seen this already as well.
from: II14016
Another message to be aware of is MSGIEA043I MAXSPACE REACHED.
This indicates a PARTIAL dump. At minimum, set DB2 using system
to a reasonable level, in MVS Commands see these commands:
DISPLAY : D D,OPTIONS
CHNGDUMP : CD SET,SDUMP,TYPE=XMEME,MAXSPACE=8000M
MAXSPACE=8000M minimum for DB2 z/OS V8 & later
Note: See II06471 : DUMPSRV uses AUX storage for dumping, you
may need to add an extra PAGE dataset when dumping DBM1.
Note: Allocate a hi-capacity device like a 3390 mod9 for dumps.
**use ACS routines for size ***
Note: With DFSMS120 and Dynamic Dump Allocation, multi-volume
EFDS format datasets can be created for your SVCDUMP.
----------------------------------------------------------------------
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [email protected] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html