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标题：存储精简卷导致asm磁盘组异常

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

有朋友在一个存储空间给asm使用，发生空间不足，然后使用另外一个存储中的lun给asm的data磁盘组增加asm disk,运行了大概1天之后,asm磁盘组直接dismount,数据库crash.然后就无法正常mount.包括这个存储上的几个其他磁盘组也无法正常mount.
数据库异常日志

Sun Oct 23 08:43:59 2016
SUCCESS: diskgroup DATA was dismounted
SUCCESS: diskgroup DATA was dismounted
Sun Oct 23 08:44:00 2016
Errors in file /oracle/app/oracle/diag/rdbms/orcl/orcl1/trace/orcl1_lmon_79128.trc:
ORA-00202: control file: '+DATA/orcl/controlfile/current.278.892363163'
ORA-15078: ASM diskgroup was forcibly dismounted
Sun Oct 23 08:44:00 2016
Errors in file /oracle/app/oracle/diag/rdbms/orcl/orcl1/trace/orcl1_lgwr_79174.trc:
ORA-00345: redo log write error block 15924 count 2
ORA-00312: online log 2 thread 1: '+DATA/orcl/onlinelog/group_2.274.892363167'
ORA-15078: ASM diskgroup was forcibly dismounted
ORA-15078: ASM diskgroup was forcibly dismounted
Errors in file /oracle/app/oracle/diag/rdbms/orcl/orcl1/trace/orcl1_lgwr_79174.trc:
ORA-00202: control file: '+DATA/orcl/controlfile/current.278.892363163'
ORA-15078: ASM diskgroup was forcibly dismounted
Errors in file /oracle/app/oracle/diag/rdbms/orcl/orcl1/trace/orcl1_lgwr_79174.trc:
ORA-00204: error in reading (block 1, # blocks 1) of control file
ORA-00202: control file: '+DATA/orcl/controlfile/current.278.892363163'
ORA-15078: ASM diskgroup was forcibly dismounted
Sun Oct 23 08:44:00 2016
LGWR (ospid: 79174): terminating the instance due to error 204
Sun Oct 23 08:44:00 2016
opiodr aborting process unknown ospid (79742) as a result of ORA-1092
Sun Oct 23 08:44:01 2016
ORA-1092 : opitsk aborting process
Sun Oct 23 08:44:01 2016
ORA-1092 : opitsk aborting process
System state dump requested by (instance=1, osid=79174 (LGWR)), summary=[abnormal instance termination].
System State dumped to trace file /oracle/app/oracle/diag/rdbms/orcl/orcl1/trace/orcl1_diag_79118.trc
Instance terminated by LGWR, pid = 79174

很明显，数据库异常是由于asm diskgroup dismount,因此分析asm 日志

asm 日志

Sun Oct 23 07:00:31 2016
Time drift detected. Please check VKTM trace file for more details.
Sun Oct 23 08:43:55 2016
Errors in file /oracle/app/oracle/diag/asm/+asm/+ASM1/trace/+ASM1_arb0_8755.trc:
ORA-27061: waiting for async I/Os failed
Linux-x86_64 Error: 5: Input/output error
Additional information: -1
Additional information: 1048576
WARNING: Write Failed. group:1 disk:2 AU:1222738 offset:0 size:1048576
ERROR: failed to copy file +DATA.524, extent 15030
ERROR: ORA-15080 thrown in ARB0 for group number 1
Errors in file /oracle/app/oracle/diag/asm/+asm/+ASM1/trace/+ASM1_arb0_8755.trc:
ORA-15080: synchronous I/O operation to a disk failed
Sun Oct 23 08:43:55 2016
NOTE: stopping process ARB0
NOTE: rebalance interrupted for group 1/0xec689cdd (DATA)
NOTE: ASM did background COD recovery for group 1/0xec689cdd (DATA)
NOTE: starting rebalance of group 1/0xec689cdd (DATA) at power 1
Starting background process ARB0
Sun Oct 23 08:43:56 2016
ARB0 started with pid=24, OS id=103554 
NOTE: assigning ARB0 to group 1/0xec689cdd (DATA) with 1 parallel I/O
Errors in file /oracle/app/oracle/diag/asm/+asm/+ASM1/trace/+ASM1_arb0_103554.trc:
ORA-27061: waiting for async I/Os failed
Linux-x86_64 Error: 5: Input/output error
Additional information: -1
Additional information: 1048576
WARNING: Write Failed. group:1 disk:2 AU:1222738 offset:0 size:1048576
ERROR: failed to copy file +DATA.256, extent 6570
ERROR: ORA-15080 thrown in ARB0 for group number 1
Errors in file /oracle/app/oracle/diag/asm/+asm/+ASM1/trace/+ASM1_arb0_103554.trc:
ORA-15080: synchronous I/O operation to a disk failed
NOTE: stopping process ARB0
Sun Oct 23 08:43:58 2016
Errors in file /oracle/app/oracle/diag/asm/+asm/+ASM1/trace/+ASM1_dbw0_8521.trc:
ORA-27061: waiting for async I/Os failed
Linux-x86_64 Error: 5: Input/output error
Additional information: -1
Additional information: 4096
WARNING: Write Failed. group:1 disk:3 AU:6789 offset:24576 size:4096
NOTE: cache initiating offline of disk 3 group DATA
NOTE: process _dbw0_+asm1 (8521) initiating offline of disk 3.3915934787 (DATA_0003) with mask 0x7e in group 1
Sun Oct 23 08:43:58 2016
WARNING: Disk 3 (DATA_0003) in group 1 mode 0x7f is now being offlined
WARNING: Disk 3 (DATA_0003) in group 1 in mode 0x7f is now being taken offline on ASM inst 1
NOTE: initiating PST update: grp = 1, dsk = 3/0xe9686c43, mask = 0x6a, op = clear
GMON updating disk modes for group 1 at 14 for pid 14, osid 8521
ERROR: Disk 3 cannot be offlined, since diskgroup has external redundancy.
ERROR: too many offline disks in PST (grp 1)
Sun Oct 23 08:43:58 2016
NOTE: cache dismounting (not clean) group 1/0xEC689CDD (DATA) 
NOTE: messaging CKPT to quiesce pins Unix process pid: 103577, image: oracle@node1 (B000)
WARNING: Disk 3 (DATA_0003) in group 1 mode 0x7f offline is being aborted
WARNING: Offline of disk 3 (DATA_0003) in group 1 and mode 0x7f failed on ASM inst 1
NOTE: halting all I/Os to diskgroup 1 (DATA)
Sun Oct 23 08:43:59 2016
NOTE: LGWR doing non-clean dismount of group 1 (DATA)
NOTE: LGWR sync ABA=160.10145 last written ABA 160.10145

错误信息很明显，由于Write Failed导致asm diskgroup dismount.

系统日志

Oct 23 08:43:55 node1 kernel: sd 6:0:12:1: [sdd]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct 23 08:43:55 node1 kernel: sd 6:0:12:1: [sdd]  Sense Key : Data Protect [current] 
Oct 23 08:43:55 node1 kernel: sd 6:0:12:1: [sdd]  Add. Sense: Space allocation failed write protect
Oct 23 08:43:55 node1 kernel: sd 6:0:12:1: [sdd] CDB: Write(16): 8a 00 00 00 00 02 e7 18 37 f9 00 00 00 07 00 00
Oct 23 08:43:55 node1 kernel: end_request: critical space allocation error, dev sdd, sector 12467058681
Oct 23 08:43:55 node1 kernel: end_request: critical space allocation error, dev dm-3, sector 12467058681
Oct 23 08:43:55 node1 kernel: sd 8:0:6:1: [sdh]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct 23 08:43:55 node1 kernel: sd 8:0:6:1: [sdh]  Sense Key : Data Protect [current] 
Oct 23 08:43:55 node1 kernel: sd 8:0:6:1: [sdh]  Add. Sense: Space allocation failed write protect
Oct 23 08:43:55 node1 kernel: sd 8:0:6:1: [sdh] CDB: Write(16): 8a 00 00 00 00 02 e7 18
Oct 23 08:43:55 node1 kernel: sd 6:0:4:1: [sdb]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct 23 08:43:55 node1 kernel: sd 6:0:4:1: [sdb]  Sense Key : Data Protect [current] 
Oct 23 08:43:55 node1 kernel: sd 6:0:4:1: [sdb]   33Add. Sense: Space allocation failed write protect
Oct 23 08:43:55 node1 kernel: sd 6:0:4:1: [sdb] CDB: Write(16): 8a 00 00 00 00 02 e7 18 30 00 00 00 03 f9 00 00
Oct 23 08:43:55 node1 kernel: end_request: critical space allocation error, dev sdb, sector 12467056640
Oct 23 08:43:55 node1 kernel: f9 00 00 04 00
Oct 23 08:43:55 node1 kernel: end_request: critical space allocation error, dev dm-3, sector 12467056640
Oct 23 08:43:55 node1 kernel: 00 00
Oct 23 08:43:55 node1 kernel: end_request: critical space allocation error, dev sdh, sector 12467057657
Oct 23 08:43:55 node1 kernel: end_request: critical space allocation error, dev dm-3, sector 12467057657
Oct 23 08:43:57 node1 kernel: sd 8:0:6:1: [sdh]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct 23 08:43:57 node1 kernel: sd 8:0:6:1: [sdh]  Sense Key : Data Protect [current] 
Oct 23 08:43:57 node1 kernel: sd 8:0:6:1: [sdh]  Add. Sense: Space allocation failed write protect
Oct 23 08:43:57 node1 kernel: sd 8:0:6:1: [sdh] CDB: Write(16): 8a 00 00 00 00 02 e7 18 37 f9 00 00 00 07 00 00
Oct 23 08:43:57 node1 kernel: end_request: critical space allocation error, dev sdh, sector 12467058681
Oct 23 08:43:57 node1 kernel: end_request: critical space allocation error, dev dm-3, sector 12467058681
Oct 23 08:43:57 node1 kernel: sd 8:0:12:1: [sdj]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct 23 08:43:57 node1 kernel: sd 8:0:12:1: [sdj]  Sense Key : Data Protect [current] 
Oct 23 08:43:57 node1 kernel: sd 8:0:12:1: [sdj]  Add. Sense: Space allocation failed write protect
Oct 23 08:43:57 node1 kernel: sd 8:0:12:1: [sdj] CDB: Write(16): 8a 00 00 00 00 02 e7 18 30 00 00 00 03 f9 00 00
Oct 23 08:43:57 node1 kernel: end_request: critical space allocation error, dev sdj, sector 12467056640
Oct 23 08:43:57 node1 kernel: end_request: critical space allocation error, dev dm-3, sector 12467056640
Oct 23 08:43:57 node1 kernel: sd 6:0:4:1: [sdb]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct 23 08:43:57 node1 kernel: sd 6:0:4:1: [sdb]  Sense Key : Data Protect [current] 
Oct 23 08:43:57 node1 kernel: sd 6:0:4:1: [sdb]  Add. Sense: Space allocation failed write protect
Oct 23 08:43:57 node1 kernel: sd 6:0:4:1: [sdb] CDB: Write(16): 8a 00 00 00 00 02 e7 18 33 f9 00 00 04 00 00 00
Oct 23 08:43:58 node1 kernel: sd 6:0:4:1: [sdb]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Oct 23 08:43:58 node1 kernel: sd 6:0:4:1: [sdb]  Sense Key : Data Protect [current] 
Oct 23 08:43:58 node1 kernel: sd 6:0:4:1: [sdb]  Add. Sense: Space allocation failed write protect
Oct 23 08:43:58 node1 kernel: sd 6:0:4:1: [sdb] CDB: Write(16): 8a 00 00 00 00 03 3b 7e 78 30 00 00 00 08 00 00
Oct 23 10:50:59 node1 init: oracle-ohasd main process (6150) killed by TERM signal

错误信息为:critical space allocation error,严重空间分配错误.也就是linux在分配空间之时发生错误.在换而言之,由于分配空间错误导致asm 磁盘组dismount.

查看多路径信息

[root@node1 ~]# multipath -ll
36000d31003190c000000000000000003 dm-3 COMPELNT,Compellent Vol
size=80T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 6:0:9:1  sdd 8:48  active ready running
  `- 8:0:9:1  sdi 8:128 active ready running
delldisk2 (36000d310031908000000000000000003) dm-4 COMPELNT,Compellent Vol
size=8.0T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 6:0:12:1 sde 8:64  active ready running
  |- 8:0:6:1  sdh 8:112 active ready running
  |- 6:0:4:1  sdb 8:16  active ready running
  `- 8:0:12:1 sdj 8:144 active ready running
delldisk1 (36000d31003190a000000000000000007) dm-2 COMPELNT,Compellent Vol
size=12T features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 6:0:1:1  sda 8:0   active ready running
  |- 8:0:2:1  sdf 8:80  active ready running
  |- 6:0:7:1  sdc 8:32  active ready running
  `- 8:0:3:1  sdg 8:96  active ready running

很明显报错的都是同一个lun(delldisk2),也就是存储空间使用完的存储.也就是说,由于delldisk2存储的空间使用尽了导致系统出现分配空间错误,从而导致asm 写失败,进而导致数据库异常.这种问题的本质其实就是存储给系统分配了8T,但是实际存储可以使用的空间不足8T,而os按照8T来使用从而出现该问题.专业名字叫做”存储精简卷”.因此各位在存储配置之时需要注意该问题.因为这种情况的出现一般只是写io异常,读依旧正常,因此不会丢失数据.

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