When I logon to TSO I see an admonition about proper blocksizes for the system.
When I allocate data sets via ISPF the defaults differ from those specified in the logon message the logon messages:
RECFM=FB,LRECL=80 datasets with a BLKSIZE other than 27920
RECFM=VB,LRECL=ANY datasets with a BLKSIZE other than 27998
ISPF:
Record format . . . . FB
Record length . . . . 80
Block size . . . . . 32000
Are the ISPF defaults legal?