RMAN backup - MAXPIECESIZE not working ?

  Hi,

We have a 11g r2 database on Linux X64 5.5
The database size is 88 GB

Here is our RMAN script and settings


configure retention policy to redundancy 1;
configure controlfile autobackup on;
configure device type disk backup type to backupset;
configure channel device type disk maxpiecesize 6G;
configure backup optimization on;
configure controlfile autobackup format for device type disk to '+FRA';
configure channel device type disk clear;
run
{
delete noprompt obsolete;
backup database plus archivelog delete input;
}

we want the backup set to consist of multiple backup pieces of 6 GB each


Here is the log of backup



old RMAN configuration parameters: