Timing of SAVLIB/RSTLIB vs CPYLIB

["Lennon_s_j@xxxxxxxxxxx" <lennon_s_j@xxxxxxxxxxx>]

Curiosity question.

Each night in the wee hours we create a test environment from a 
production library, thus:
	SAVLIB PROD01 to QTEMP/SAVF
	CLRLIB TST01
	RSTLIB QTEMPSAVF to TST01

It runs in about 41-45 minutes.

Last night I had to do a (occasional) copy of T01 to T02.  I did this:
	CLRLIB T02
	CPYLIB T01 to T02

It took 45 minutes.  I figured creating T02 this way would be quite a 
bit faster than creating T01, but it wasn’t.

T01 was created about 3-3:45 am.  T02 was created 4:30-5:15 am.  There 
is really nothing else running at these times.

Any thoughts on why the CPYLIB approach is not faster?   CPYLIB did seem 
to do a lot of index rebuilding (observed in a test during the day.) 
Maybe SAVLIB/RSTLIB is smarter about indexes and/or does more in parallel.