Rman creating many backupsets

Hi all,
Rman is creating an awful lot of backupsets for one of our databases during the regular d0/c1 backup schedule.
It's a very simple script we're using, we're not using anything like maxsetsize/maxpiecesize/maxopenfiles/filesperset etc.
So it's pretty basic, see the output of show all below:
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 100 DAYS;
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO 'SBT_TAPE';
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/afs1/MOT/rman/ctl/%F';
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE SBT_TAPE TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 4 BACKUP TYPE TO BACKUPSET;
CONFIGURE DEVICE TYPE 'SBT_TAPE' PARALLELISM 1 BACKUP TYPE TO BACKUPSET;
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE SBT_TAPE TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE SBT_TAPE TO 1; # default
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '/afs6/Staging/oracle/%d_%s_%t_%p';
CONFIGURE CHANNEL DEVICE TYPE 'SBT_TAPE' FORMAT '%d_%s_%t_%p' PARMS 'ENV=(NSR_SERVER=pwxs51,NSR_GROUP=PROD)';
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/afs5/PROD/db/tech_st/10.2.0/dbs/snapcf_PROD.f'; # default
And here's our incremental level 1 script (same issue with d0 btw).
configure retention policy to recovery window of 100 days;
configure controlfile autobackup on;
configure default device type to sbt;
configure device type sbt parallelism 1;
configure channel device type sbt format '%d_%s_%t_%p' PARMS 'ENV=(NSR_SERVER=pwxs51,NSR_GROUP=PROD)';
RUN
set command id to 'RMAN onl c1 to nsr';
backup incremental level 1 database;
backup archivelog all not backed up 1 times;
delete noprompt archivelog until time 'sysdate-1/24' backed up 1 times to device type sbt;
There's a total of 91 datafiles, yet somehow the backup is creating 41 backupsets.
The odd thing is that we have a development clone of this database (on different node), which is being backupped with pretty much the same script/configuration to the same tapeserver and this backup is only creating 2 backupsets.
It's a 10.2.0.3 database on Solaris 9.
It's not really a problem as far as I'm concerned, I just would like to know what is causing rman to create this many backupsets.
Btw the disk parallelism 4 is configured for a weekly disk backup, which is also showing this many backupsets.
It's not an extremely big database, about 200GB.
Does anyone know what could be causing this?
Thanks in advance,
BR,
Lauris

Sorry, there's no limit to the files per set configured either.
I hit the maximum characters for a post when trying to post the output.
So for the PROD db I've had to reduce it to last nights backup only.
The 2 entries from March 5th are from this morning's archive spooling job.
P.START_TIME||''||P.HANDLE||''||COUNT(D.FILE#)
+04-MAR-10 c-4252449814-20100304-00 1+
+04-MAR-10 /afs1/MOT/rman/ctl/c-4252449814-20100304-01 1+
+04-MAR-10 c-4252449814-20100304-02 1+
+04-MAR-10 /afs1/MOT/rman/ctl/c-4252449814-20100304-03 1+
+04-MAR-10 PROD_22453_712782223_1 10+
+04-MAR-10 PROD_22454_712782408_1 10+
+04-MAR-10 PROD_22455_712782423_1 1+
+04-MAR-10 PROD_22456_712782427_1 1+
+04-MAR-10 PROD_22457_712782442_1 1+
+04-MAR-10 PROD_22458_712782487_1 1+
+04-MAR-10 PROD_22459_712782532_1 1+
+04-MAR-10 PROD_22460_712782547_1 1+
+04-MAR-10 PROD_22461_712782603_1 1+
+04-MAR-10 PROD_22462_712782648_1 1+
+04-MAR-10 PROD_22463_712782703_1 1+
+04-MAR-10 PROD_22464_712782758_1 1+
+04-MAR-10 PROD_22465_712782804_1 1+
+04-MAR-10 PROD_22466_712782889_1 1+
+04-MAR-10 PROD_22467_712782964_1 1+
+04-MAR-10 PROD_22468_712783019_1 1+
+04-MAR-10 PROD_22469_712783094_1 1+
+04-MAR-10 PROD_22470_712783160_1 1+
+04-MAR-10 PROD_22471_712783215_1 1+
+04-MAR-10 PROD_22472_712783260_1 1+
+04-MAR-10 PROD_22473_712783315_1 1+
+04-MAR-10 PROD_22474_712783381_1 1+
+04-MAR-10 PROD_22475_712783416_1 1+
+04-MAR-10 PROD_22476_712783691_1 1+
+04-MAR-10 PROD_22477_712783716_1 1+
+04-MAR-10 PROD_22478_712783742_1 4+
+04-MAR-10 PROD_22479_712783745_1 3+
+04-MAR-10 PROD_22480_712783752_1 3+
+04-MAR-10 PROD_22481_712783937_1 5+
+04-MAR-10 PROD_22482_712784123_1 5+
+04-MAR-10 PROD_22483_712784308_1 2+
+04-MAR-10 PROD_22484_712784311_1 2+
+04-MAR-10 PROD_22485_712784327_1 2+
+04-MAR-10 PROD_22486_712784352_1 6+
+04-MAR-10 PROD_22487_712784547_1 2+
+04-MAR-10 PROD_22488_712784554_1 2+
+04-MAR-10 PROD_22489_712784570_1 3+
+04-MAR-10 PROD_22490_712784577_1 2+
+04-MAR-10 PROD_22491_712784642_1 2+
+04-MAR-10 PROD_22492_712784649_1 5+
+04-MAR-10 c-4252449814-20100304-04 1+
+04-MAR-10 /afs1/MOT/rman/ctl/c-4252449814-20100304-05 1+
+05-MAR-10 c-4252449814-20100305-00 1+
+05-MAR-10 /afs1/MOT/rman/ctl/c-4252449814-20100305-01 1+
Redo:
P.START_TIME||''||P.HANDLE||''||COUNT(R.SEQUENCE#)
+03-MAR-10 PROD_22393_712647079_1 56+
+03-MAR-10 PROD_22397_712690268_1 54+
+03-MAR-10 PROD_22441_712698364_1 9+
+04-MAR-10 PROD_22445_712733473_1 55+
+04-MAR-10 PROD_22449_712776691_1 55+
+04-MAR-10 PROD_22493_712784679_1 9+
+05-MAR-10 PROD_22497_712819874_1 54+
And for the development copy db (named DEV0) backups from past 3 days:
P.START_TIME||''||P.HANDLE||''||COUNT(D.FILE#)
+03-MAR-10 DEV0_2103_712630857_1 38+
+03-MAR-10 DEV0_2104_712633523_1 38+
+03-MAR-10 c-4252449814-20100303-00 1+
+03-MAR-10 /afs4/DEV0/db/tech_st/10.2.0/dbs/c-4252449814-20100303-01 1+
+03-MAR-10 DEV0_2110_712713531_1 38+
+04-MAR-10 DEV0_2111_712716417_1 38+
+04-MAR-10 c-4252449814-20100304-00 1+
+04-MAR-10 /afs4/DEV0/db/tech_st/10.2.0/dbs/c-4252449814-20100304-01 1+
+04-MAR-10 DEV0_2117_712799889_1 38+
+05-MAR-10 DEV0_2118_712802825_1 38+
+05-MAR-10 c-4252449814-20100305-00 1+
+05-MAR-10 /afs4/DEV0/db/tech_st/10.2.0/dbs/c-4252449814-20100305-01 1+
+32 rows selected.+
Redo:
P.START_TIME||''||P.HANDLE||''||COUNT(R.SEQUENCE#)
+26-FEB-10 DEV0_2070_711942703_1 1+
+26-FEB-10 DEV0_2074_712022211_1 20+
+27-FEB-10 DEV0_2077_712097440_1 1+
+27-FEB-10 DEV0_2081_712108557_1 1+
+28-FEB-10 DEV0_2084_712190509_1 4+
+28-FEB-10 DEV0_2088_712194956_1 1+
+01-MAR-10 DEV0_2091_712459919_1 1+
+01-MAR-10 DEV0_2095_712540585_1 2+
+02-MAR-10 DEV0_2098_712546862_1 1+
+02-MAR-10 DEV0_2102_712626975_1 2+
+03-MAR-10 DEV0_2105_712635762_1 1+
+03-MAR-10 DEV0_2109_712713420_1 2+
+04-MAR-10 DEV0_2112_712719205_1 1+
+04-MAR-10 DEV0_2116_712799797_1 2+
+05-MAR-10 DEV0_2119_712805603_1 1+
+15 rows selected.+
So for the PROD db the amount of datafiles in a backupset is not always the same, sometimes it's 6 but its 1 most of the times.
Br,
Lauris

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