User tried to fallback from r19 to r18 Insight data collector failed with the following errors
DBG21001I TEST 16:07:47 HISTORY: INITIALIZATION STARTING
DBG21023E TEST 16:07:47 HISTORY: FILE HSTSTATS INVALID HISTORY FILE.
DBG36017E TEST 16:07:47 OPEN FAILED FOR DDNAME HSTSTATS
DBG11017I TEST 16:07:47 ESTAE EXIT IN NUHSTLOG INVOKED BY ABEND
ABEND CODE IS 04138000 - EC PSW AT ABEND IS 070C2001 9651A600 - PRIMARY MODE, SUPR STATE, 64-BIT MODE, PASID/SASID=00070118, TCB
ILC, INTERRUPT CODE 0002000D - TRANSLATE EXCEP 7F473400
R0 00000000 R1 04138000 R2 00000247 R3 0042D680
R4 00000000 R5 00000000 R6 7E90F238 R7 00000004
R8 00000247 R9 7E90F238 R10 00000000 R11 00000000
R12 1651AD10 R13 7E90ECD8 R14 1651A6DC R15 02470003
AR0 2FFFFFFF AR1 00000000 AR2 00000000 AR3 00000000
AR4 00000000 AR5 00000001 AR6 00000002 AR7 00000000
AR8 00000000 AR9 00000000 AR10 00000000 AR11 00000001
AR12 00000000 AR13 00000000 AR14 00000000 AR15 0671A740
XR0 00000000_00000000 XR1 C4C2E4C7_04138000 XR2 00000050_00000247 XR3 00000050_0042D680
XR4 00000000_00000000 XR5 00000000_00000000 XR6 00000000_7E90F238 XR7 00000000_00000004
XR8 00000000_00000247 XR9 00000000_7E90F238 XR10 00000000_00000000 XR11 00000000_00000000
XR12 00000000_1651AD10 XR13 00000000_7E90ECD8 XR14 00000000_1651A6DC XR15 00000000_02470003
What's wrong?
Once you upgrade the product from the lower to the higher release and you take with you the history files of the lower release and start writing to them in the higher release, you can't use them if you fallback to the lower level again.
If you try to use them again with the lower level Datacollector, you'll get the following error:
DBG21023E TEST 16:07:47 HISTORY: FILE HSTSTATS INVALID HISTORY FILE.
DBG36017E TEST 16:07:47 OPEN FAILED FOR DDNAME HSTSTATS
The best option will be to create a new R18 files if you want to fall back.