Folowing was the error received in the backup server errorlog when dump tran was executed
dump transaction XXX using config = 'XXXLOG'
Changed database context to 'master'.
Backup Server session id is: 134. Use this value when executing the 'sp_volchanged' system stored procedure after fulfilling any volume change request from the Backup Server.
Backup Server: 184.108.40.206: Creating new disk file /backupAll/CJ3/sybase/log_backups/CJ3.TRAN.20141117.110002.000.
Backup Server: 220.127.116.11:  The 'open' call failed for database/archive device while working on stripe device '/backupAll/CJ3/sybase/log_backups/CJ3.TRAN.20141117.110002.000' with error number 13 (Permission denied). Refer to your operating system document
ASE version: ASE 15.7 SP102 on AIX 7.1
What is the exact reason for this error?