Redo Logs Mysql Cluster

Question

The mysql cluster has 4 directories namely D8 D9 D10 D11 for redo logfiles. But while inserting into table only one redo directory is used. I ran following command to get redo information "all dump 2398" and i get:

REDO part: 0 HEAD: file: 0 mbyte: 0 TAIL: file: 0 mbyte: 0 total: 12 free: 12 (mb) REDO part: 1 HEAD: file: 0 mbyte: 0 TAIL: file: 0 mbyte: 0 total: 12 free: 12 (mb) REDO part: 2 HEAD: file: 1 mbyte: 0 TAIL: file: 2 mbyte: 2 total: 12 free: 6 (mb) REDO part: 3 HEAD: file: 0 mbyte: 0 TAIL: file: 0 mbyte: 0 total: 12 free: 12 (mb)

It doesn't uses REDO part: 0 REDO part: 1 REDO part: 4 . It only uses REDO part: 3 It will give "ERROR 1297 (HY000): Got temporary error 410 'REDO log files overloaded (decrease TimeBetweenLocalCheckpoints or increase NoOfFragmentLogFiles)' from NDBCLUSTER" inspite of using rest of redo files. Why should we allocate 4 times space if it only uses 1 of 4 redo files?