ORA-01196: file 1 is inconsistent due to a failed media recovery session I have 3 database 1 primary and two standby, The storage of one the standby was abruptly removed without shutting down the database. 

Few Days later the storage was returned, I restart the whole database server, and while trying to open my database instance(alter database open) I get the errors below:

ERROR at line 1:
ORA-10458: standby database requires recovery
ORA-01196: file 1 is inconsistent due to a failed media recovery session
ORA-01110: data file 1: '+DATA/drstby/datafile/system.306.918916853'

I tried to do "recover database;" and I get another error:

RMAN-03002: failure of recover command at 12/15/2017 17:11:50
RMAN-06054: media recovery requesting unknown archived log for thread 1 with sequence 62585 and starting SCN of 16625729961

Please what can I do.

Note:
the database in question has the following
FRA
ASM
RMAN BACKUPS.
THANKS
Looks like you need to restore archivelogs. If you have them backed up to tape, you may need to do something like:

run
{
  allocate channel ch1 type 'sbt_tape' parms
  restore archivelog from scn 16625729961 until scn 999999999;
} 


Replace the until scn 999999999 with an appropriate scn from your primary database.