上面的内容也就是不能对磁盘组执行IO操作，并没有得到更有用的信息。如是查看asm的alert.log文件，可以看到如下信息:
Thu Mar 31 14:29:18 2016 WARNING: Waited 15 secs for write IO to PST disk 0 in group 3. WARNING: Waited 15 secs for write IO to PST disk 1 in group 3. WARNING: Waited 15 secs for write IO to PST disk 2 in group 3. WARNING: Waited 15 secs for write IO to PST disk 0 in group 3. WARNING: Waited 15 secs for write IO to PST disk 1 in group 3. WARNING: Waited 15 secs for write IO to PST disk 2 in group 3. Thu Mar 31 14:29:18 2016 NOTE: process _b000_+asm1 (22544528) initiating offline of disk 0.3043853018 (GJJ_DG_0000) with mask 0x7e in group 3 NOTE: process _b000_+asm1 (22544528) initiating offline of disk 1.3043853019 (GJJ_DG_0001) with mask 0x7e in group 3 NOTE: process _b000_+asm1 (22544528) initiating offline of disk 2.3043853020 (GJJ_DG_0002) with mask 0x7e in group 3 NOTE: checking PST: grp = 3 GMON checking disk modes for group 3 at 10 for pid 30, osid 22544528 ERROR: no read quorum in group: required 2, found 0 disks NOTE: checking PST for grp 3 done. NOTE: initiating PST update: grp = 3, dsk = 0/0xb56d82da, mask = 0x6a, op = clear NOTE: initiating PST update: grp = 3, dsk = 1/0xb56d82db, mask = 0x6a, op = clear NOTE: initiating PST update: grp = 3, dsk = 2/0xb56d82dc, mask = 0x6a, op = clear GMON updating disk modes for group 3 at 11 for pid 30, osid 22544528 ERROR: no read quorum in group: required 2, found 0 disks Thu Mar 31 14:29:18 2016 NOTE: cache dismounting (not clean) group 3/0x46ED7239 (GJJ_DG) NOTE: messaging CKPT to quiesce pins Unix process pid: 30277648, image: oracle@p720a (B001) Thu Mar 31 14:29:18 2016 NOTE: halting all I/Os to diskgroup 3 (GJJ_DG) Thu Mar 31 14:29:18 2016 NOTE: LGWR doing non-clean dismount of group 3 (GJJ_DG) NOTE: LGWR sync ABA=22.4306 last written ABA 22.4306 WARNING: Offline for disk GJJ_DG_0000 in mode 0x7f failed. WARNING: Offline for disk GJJ_DG_0001 in mode 0x7f failed. WARNING: Offline for disk GJJ_DG_0002 in mode 0x7f failed. Thu Mar 31 14:29:18 2016 kjbdomdet send to inst 2 detach from dom 3, sending detach message to inst 2 Thu Mar 31 14:29:18 2016 List of instances: 1 2 Dirty detach reconfiguration started (new ddet inc 1, cluster inc 20) Global Resource Directory partially frozen for dirty detach * dirty detach - domain 3 invalid = TRUE 305 GCS resources traversed, 0 cancelled Thu Mar 31 14:29:18 2016 ERROR: ORA-15130 in COD recovery for diskgroup 3/0x46ed7239 (GJJ_DG) ERROR: ORA-15130 thrown in RBAL for group number 3 Dirty Detach Reconfiguration complete Errors in file /opt/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_rbal_12386526.trc: ORA-15130: diskgroup "GJJ_DG" is being dismounted Thu Mar 31 14:29:18 2016 WARNING: dirty detached from domain 3 NOTE: cache dismounted group 3/0x46ED7239 (GJJ_DG) NOTE: cache deleting context for group GJJ_DG 3/0x46ed7239 SQL> alter diskgroup GJJ_DG dismount force /* ASM SERVER:1189966393 */ Thu Mar 31 14:29:18 2016 NOTE: No asm libraries found in the system ERROR: ORA-15130 in COD recovery for diskgroup 3/0x46ed7239 (GJJ_DG) ERROR: ORA-15130 thrown in RBAL for group number 3 Errors in file /opt/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_rbal_12386526.trc: ORA-15130: diskgroup "" is being dismounted ERROR: ORA-15130 in COD recovery for diskgroup 3/0x46ed7239 (GJJ_DG) ERROR: ORA-15130 thrown in RBAL for group number 3 Errors in file /opt/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_rbal_12386526.trc: ORA-15130: diskgroup "" is being dismounted ERROR: ORA-15130 in COD recovery for diskgroup 3/0x46ed7239 (GJJ_DG) ERROR: ORA-15130 thrown in RBAL for group number 3 Errors in file /opt/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_rbal_12386526.trc: ORA-15130: diskgroup "" is being dismounted Thu Mar 31 14:29:27 2016 NOTE: ASM client jtpsoft1:jtpsoft disconnected unexpectedly. NOTE: check client alert log. NOTE: Trace records dumped in trace file /opt/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_14024932.trc ASM Health Checker found 1 new failures Thu Mar 31 14:29:30 2016 ERROR: ORA-15130 in COD recovery for diskgroup 3/0x46ed7239 (GJJ_DG) ERROR: ORA-15130 thrown in RBAL for group number 3 Errors in file /opt/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_rbal_12386526.trc: ORA-15130: diskgroup "" is being dismounted ERROR: ORA-15130 in COD recovery for diskgroup 3/0x46ed7239 (GJJ_DG) ERROR: ORA-15130 thrown in RBAL for group number 3 Errors in file /opt/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_rbal_12386526.trc: ORA-15130: diskgroup "" is being dismounted ERROR: ORA-15130 in COD recovery for diskgroup 3/0x46ed7239 (GJJ_DG) ERROR: ORA-15130 thrown in RBAL for group number 3 Errors in file /opt/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_rbal_12386526.trc: ORA-15130: diskgroup "" is being dismounted Thu Mar 31 14:29:37 2016 GMON dismounting group 3 at 12 for pid 31, osid 30277648 Thu Mar 31 14:29:37 2016 NOTE: Disk GJJ_DG_0000 in mode 0x7f marked for de-assignment NOTE: Disk GJJ_DG_0001 in mode 0x7f marked for de-assignment NOTE: Disk GJJ_DG_0002 in mode 0x7f marked for de-assignment SUCCESS: diskgroup GJJ_DG was dismounted SUCCESS: alter diskgroup GJJ_DG dismount force /* ASM SERVER:1189966393 */ SUCCESS: ASM-initiated MANDATORY DISMOUNT of group GJJ_DG Thu Mar 31 14:29:37 2016 NOTE: diskgroup resource ora.GJJ_DG.dg is offline Thu Mar 31 14:29:44 2016 Errors in file /opt/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_15073504.trc: ORA-17503: ksfdopn:2 Failed to open file +GJJ_DG/jtpsoft/spfilejtpsoft.ora ORA-15001: diskgroup "GJJ_DG" does not exist or is not mounted 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 614400 606078 204800 200639 0 N BACK_DG/ MOUNTED NORMAL N 512 4096 1048576 10240 9310 2048 3631 0 Y CRS_DG/ MOUNTED NORMAL N 512 4096 1048576 1228800 858311 409600 224355 0 N GJJ_DG/