测试环境，启动DB状态不正常
检查DB ALERT发现无法在+DATA磁盘组空间不足，ASMCMD lsdg确认空间问题，删除归档后，问题处理。
$ srvctl start database -d rac$ crsctl stat res -tora.rac.db
1 ONLINE INTERMEDIATE a1 Stuck Archiver
2 ONLINE ONLINE a2 Open
*************************************************************
ARC0: Error 19504 Creating archive log file to '+DATA'
Unable to create archive log file '+DATA'
Errors in file /picclife/app/oracle/diag/rdbms/liuliu/rac1/trace/rac1_arc1_27479.trc:
ORA-19816: WARNING: Files may exist in db_recovery_file_dest that are not known to database.
ORA-17502: ksfdcre:4 Failed to create file +DATA
ORA-15041: diskgroup "DATA" space exhausted
*************************************************************
WARNING: A file of type ARCHIVED LOG may exist in
db_recovery_file_dest that is not known to the database.
Use the RMAN command CATALOG RECOVERY AREA to re-catalog
any such files. If files cannot be cataloged, then manually
delete them using OS command. This is most likely the
result of a crash during file creation.
*************************************************************
ARC1: Error 19504 Creating archive log file to '+DATA
ASMCMD> lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Voting_files Name
MOUNTED NORMAL N 512 4096 1048576 16384 58 0 29 0 N DATA/
MOUNTED EXTERN N 512 4096 1048576 8192 7688 0 7688 0 N FRA/
$ rman target /
RMAN> delete archivelog all;
Do you really want to delete the above objects (enter YES or NO)? yes
deleted archived log
archived log file name=+DATA/liuliu/archivelog/2020_01_19/thread_1_seq_18.261.1030100623 RECID=2 STAMP=1030100622
来源：https://www.cnblogs.com/lvcha001/p/12213405.html