RMAN-03009 and ORA-19510: failed to set size of 92079 blocks for file

If you RMAN backup commands are failing with RMAN-03009 with ORA-19502 and ORA-19510, it is because your destination file system has no space left on it for the backup. You need to make sure that file system where you are storing backup should have sufficient space to host the backup. Output of command may be similar to the following

… … … input datafile file number=00016 name=+DATA/mydb/data01.dbf input datafile file number=00020 name=+DATA/mydb/tools01.dbf input datafile file number=00001 name=+DATA/mydb/system01.dbf input datafile file number=00025 name=+DATA/mydb/data02.dbf channel dsk1: starting piece 1 at 2017-06-07 12:00:08 channel dsk2: starting compressed incremental level 0 datafile backup set channel dsk2: specifying datafile(s) in backup set input datafile file number=00005 name=+DATA/mydb/officedata01.dbf input datafile file number=00009 name=+DATA/mydb/officeindx01.dbf input datafile file number=00013 name=+DATA/mydb/trandata01.dbf input datafile file number=00017 name=+DATA/mydb/tranindx01.dbf input datafile file number=00024 name=+DATA/mydb/hrdata01.dbf input datafile file number=00002 name=+DATA/mydb/sysaux01.dbf channel dsk2: starting piece 1 at 2017-06-07 12:00:08 channel dsk3: starting compressed incremental level 0 datafile backup set channel dsk3: specifying datafile(s) in backup set RMAN-03009: failure of backup command on dsk3 channel at 06/07/2017 12:01:53 ORA-19502: write error on file "/backup/mydb/ora_20170607_q7s66o28_1_1.rbf", block number 91521 (block size=8192) ORA-27072: File I/O error Linux-x86_64 Error: 5: Input/output error Additional information: 4 Additional information: 91521 Additional information: -1 channel dsk3 disabled, job failed on it will be run on another channel RMAN-03009: failure of backup command on dsk2 channel at 06/07/2017 12:02:00 ORA-19502: write error on file "/backup/mydb/ora_20170607_q6s66o28_1_1.rbf", block number 100353 (block size=8192) ORA-27072: File I/O error Linux-x86_64 Error: 5: Input/output error Additional information: 4 Additional information: 100353 Additional information: -1 channel dsk2 disabled, job failed on it will be run on another channel RMAN-03009: failure of backup command on dsk4 channel at 06/07/2017 12:02:00 ORA-19510: failed to set size of 92079 blocks for file "/backup/mydb/ora_20170607_q8s66o28_1_1.rbf" (block size=8192) ORA-27045: unable to close the file Linux-x86_64 Error: 5: Input/output error Additional information: 4 channel dsk4 disabled, job failed on it will be run on another channel released channel: dsk1 released channel: dsk2 released channel: dsk3 released channel: dsk4 RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03009: failure of backup command on dsk1 channel at 06/07/2017 12:02:15 ORA-19502: write error on file "/backup/mydb/ora_20170607_q5s66o28_1_1.rbf", block number 133889 (block size=8192) ORA-27072: File I/O error Linux-x86_64 Error: 5: Input/output error Additional information: 4 Additional information: 133889 Additional information: -1