FRA in use, backups written directly to a deduplication device

Oracle 11.1.0.7
An FRA is in use to store archive logs and flashback logs.
RMAN full and incremental backups write directly to EMC's Data Domain, a deduplication storage system, this appliance replicates to a secondary recovery location.
The Data Domain storage device is nfs-mounted to the database server, for our purposes it looks to be disk.
Before we nfs-mounted this storage area, we used NetBackUp SBT_TAPE.
Now that we are nfs-mounted we are removing NetBackUp and writing directly to DISK.
Storage conservation and reliability are the reasons behind the decision to move backup sets out of the FRA.
Sounds reasonable; we don't need duplicate storage of the backup in the FRA (in ASM) and then backing it up to the dedup location.
Also, the backup is immediately replicated to another location, so that intermediary time when the backup set resides only in the FRA is
eliminated, so the possibility of something happening goes away.
We are following a Best Practices document from EMC Data Domain. Another distinction this document makes is that archivelogs should be backed up separately and not with the backupset to take full advantage of dedupping rates.
While I understand the logic, from the Oracle perspective there are things that we give up by not fully utilizing the FRA. They may be a small number of things that are not impactfull, but I'm gathering a list of facts. Some things I think :
- BACKUP RECOVERY AREA can't be used
- more manual management of backup sets requiring different backup commands
- size management of the FRA considers all pieces of the backup, flashback and archivelogs
I'm sure there are things missing from this list. I am also sure that we will continue to span FRA and Dedup storage for Oracle backups, but I'd like to know all of the facts on what I'm losing by doing so.
Any insight would be appreciated.
Sherrie

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I have got a 2 node RAC cluster.
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ALTER DATABASE REGISTER LOGFILE '/u02/fra/RCAT/archivelog/2010_09_19/o1_mf_1_33_69bfo5tx_.arc'
ERROR at line 1:
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Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/u02/fra/RCAT/archivelog/2010_09_19/o1_mf_1_33_69bfo5tx_.arc
ORA-00310: archived log contains sequence 33; sequence 39 required
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-rw-r----- 1 oracle dba 49313280 Sep 19 00:01 o1_mf_1_33_69bfo5tx_.arc
-rw-r----- 1 oracle dba   312320 Sep 19 00:03 o1_mf_1_34_69bft63b_.arc
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-rw-r----- 1 oracle dba    40960 Sep 19 02:12 o1_mf_1_36_69boc9t8_.arc
-rw-r----- 1 oracle dba    20992 Sep 19 02:13 o1_mf_1_37_69bofng4_.arc
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NAME                                        FIRST_CHANGE# NEXT_CHANGE#
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/u02/fra/RCAT/archivelog/2010_09_19/o1_mf_1_36_69boc9t8_.arc        1269766     1269876
/u02/fra/RCAT/archivelog/2010_09_19/o1_mf_1_38_69bokwbf_.arc        1269935     1270557
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/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_24_699s5pj8_.arc        1215736     1224966
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_26_699s5rp4_.arc        1224969     1224972
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_15_6987rbqp_.arc        1174393     1174511
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_23_699l4xng_.arc        1215733     1215736
NAME                                        FIRST_CHANGE# NEXT_CHANGE#
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_28_699s5tqt_.arc        1224975     1224987
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_22_699l4w5r_.arc        1215730     1215733
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_29_699s5vw2_.arc        1224987     1224990
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_19_699l4or0_.arc        1215721     1215724
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_25_699s5qd6_.arc        1224966     1224969
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/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_27_699s5stf_.arc        1224972     1224975
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_32_69b2hgvz_.arc        1225003     1241003
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/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_20_699l4rx2_.arc        1215724     1215727
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/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_14_6987mljx_.arc        1162149     1174393
/u02/fra/RCAT/archivelog/2010_09_18/o1_mf_1_31_699s61sr_.arc        1224999     1225003
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-------------------------------------------------------------------------------------------------------------------------------------------
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2 MAXLOGFILES 16
3 MAXLOGMEMBERS 3
4 MAXDATAFILES 100
5 MAXINSTANCES 8
6 MAXLOGHISTORY 292
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17 CHARACTER SET WE8ISO8859P1
18 ;
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