I'm testing BRMS parallel save/restore, but found the time using 4 tape drives is more or less same as 1 single tape drive.
My iSeries is i570, V5R3, Group PTF SF99185 Level 014, tape drives are LTO3 each connected to a individual f/c 5704 tape controller.
backup 1 library of 1300 objects 124GB takes 14 minutes and restore takes about 1 hour. Checked with IBM said maybe my 124GB data too small to gain the benefit of parallel save/restore, or there're too many small objects. Is that true? Much appreciated if someone can help.