i can't anderstand the number of extent of this DB2 VSAM :

Command - Enter "/" to select action Tracks %Used XT

------------------------------------------------------------------------------

DB2REEL.DSNDBD.DBRL.TSN973RL.I0001.A003 87375 ? 163

in five volumes

DB2REEL.DSNDBD.DBRL.TSN973RL.I0001.A003 23865 ? 44

DB2REEL.DSNDBD.DBRL.TSN973RL.I0001.A003 4515 ? 47

DB2REEL.DSNDBD.DBRL.TSN973RL.I0001.A003 26790 ? 42

DB2REEL.DSNDBD.DBRL.TSN973RL.I0001.A003 25185 ? 27

DB2REEL.DSNDBD.DBRL.TSN973RL.I0001.A003 7020 ? 3

A listcat of this VSAM :

ALLOCATION

SPACE-TYPE------CYLINDER HI-A-RBA------4294656000

SPACE-PRI--------------2 HI-U-RBA------4293906432

SPACE-SEC--------------1

VOLUME

VOLSER------------PDBDJ0 PHYREC-SIZE---------4096 HI-A-RBA------

221921280 EXTENT-NUMBER---------47

DEVTYPE------X'3010200F' PHYRECS/TRK-----------12 HI-U-RBA------

221921280 EXTENT-TYPE--------X'40'

VOLFLAG------------PRIME TRACKS/CA-------------15

EXTENTS:

LOW-CCHH-----X'03120000' LOW-RBA----------------0 TRACKS--------

-------30

So i guess it is allocated with : SPACE=(CYL,(2,1))

So to reach 87375 TRACKS with 123 EXTENT, the allocation SPACE=(CYL,(2,1)) is not enought...

my calcul is that :

2 CYLS * 5 VOLUMEs = 10 CYLS = 150 TRACKS n(corresponding to the primary allocation in each volume)

and

1 CYL * (163 - 5) = 158 CYL (163 is the number of extent et 5 the primaray ectent in each volume).

So we have : 158 CYLS + 10 CYLS = 2520 TRACKS

and the dataset has : 87375 TRACKS

So i can't anderstand the difference...