Archived Redo Logs Written After Creation of a Flash Recovery Area

I am converting a preexisting 10gR2 database to use a flash recovery area and am confused about the creation of archived redo logs.

My spfile.ora parameters are:

*.db_recovery_file_dest='/orabackt/EIST'
*.db_recovery_file_dest_size=10G

*.log_archive_dest_1='LOCATION=USE_DB_RECOVERY_FILE_DEST MANDATORY
REOPEN=60'
*.log_archive_dest_10=''
*.log_archive_dest_2='LOCATION=/t13/admin/EIST/arch'
*.log_archive_format='EIST_%t_%s_%r.arc'

After converting to the flash recovery area the archived redo logs written to log_archive_dest_2 are:
/t13/admin/EIST/arch $ ls -ltr
-rw-r----- 1 oracle dba 2619904 Oct 10 17:05 EIST_1_4596_463323396.arc
-rw-r----- 1 oracle dba 216064 Oct 10 17:17 EIST_1_4597_463323396.arc
Their names follow the format defined by parameter log_archive_format.

The archived redo logs written to the flash recovery area are: /orabackt/EIST/EIST/archivelog/2007_10_10 $ ls -ltr -rw-r----- 1 oracle dba 2619904 Oct 10 17:05 o1_mf_1_4596_3jthmvww_.arc
-rw-r----- 1 oracle dba 216064 Oct 10 17:17 o1_mf_1_4597_3jtjcxgf_.arc

I had expected the archived redo logs to be written to /orabackt/EIST, since that was the value assigned to db_recovery_file_dest. Is it normal for these additional levels of subdirectories to be defined? /orabackt/EIST/EIST/archivelog/2007_10_10

Is it normal for the archived redo logs in these two destinations to have different file names?
EIST_1_4596_463323396.arc vs. o1_mf_1_4596_3jthmvww_.arc

Thank you,
Bill Received on Wed Oct 10 2007 - 17:11:38 CDT