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こんな可能性もある：ORACLE ASMがディスクを無事に追加したが，disk groupのrebalanceが始まっていない。けど、追加したdiskにはハードウェアトラブルが起きて、ディスクを追加したあと、ディスクヘッダに書き込むすべてのメータデータもなくした。それに、diskgroupは外部のリダンダンシーで、つまりEXTERNAL Redundancyである。だからそのdiskgroupはあるDISKに追加した。そのDISKのmetadataを全部なくしたから、diskgroup がまともにMOUNTできない。
disk headerのKFBTYP_DISKHEADだけじゃなく、追加したdiskのすべてのmetadataもなくしたから、KFBTYP_DISKHEADの情報をkfed mergeでリカバリできない。特別な人工処置でこのトラブルを避けられる。
以下のインスタンスのように:
SUCCESS: diskgroup TESTDG03 was created
NOTE: cache deleting context for group TESTDG03 1/0x86485c30
NOTE: cache registered group TESTDG03 number=1 incarn=0xab385c36
NOTE: cache began mount (first) of group TESTDG03 number=1 incarn=0xab385c36
NOTE: Assigning number (1,3) to disk (/oracleasm/asm-disk04)
NOTE: Assigning number (1,2) to disk (/oracleasm/asm-disk03)
NOTE: Assigning number (1,1) to disk (/oracleasm/asm-disk02)
NOTE: Assigning number (1,0) to disk (/oracleasm/asm-disk01)
Thu Jan 29 08:21:07 2015
NOTE: GMON heartbeating for grp 1
GMON querying group 1 at 92 for pid 20, osid 20176
Thu Jan 29 08:21:07 2015
NOTE: cache opening disk 0 of grp 1: TESTDG03_0000 path:/oracleasm/asm-disk01
NOTE: F1X0 found on disk 0 au 2 fcn 0.0
NOTE: cache opening disk 1 of grp 1: TESTDG03_0001 path:/oracleasm/asm-disk02
NOTE: cache opening disk 2 of grp 1: TESTDG03_0002 path:/oracleasm/asm-disk03
NOTE: cache opening disk 3 of grp 1: TESTDG03_0003 path:/oracleasm/asm-disk04
NOTE: cache mounting (first) external redundancy group 1/0xAB385C36 (TESTDG03)
NOTE: cache recovered group 1 to fcn 0.0
NOTE: redo buffer size is 256 blocks (1053184 bytes)
Thu Jan 29 08:21:07 2015
NOTE: LGWR attempting to mount thread 1 for diskgroup 1 (TESTDG03)
NOTE: LGWR found thread 1 closed at ABA 0.10750
NOTE: LGWR mounted thread 1 for diskgroup 1 (TESTDG03)
NOTE: LGWR opening thread 1 at fcn 0.0 ABA 2.0
NOTE: setting 11.2 start ABA for group TESTDG03 thread 1 to 2.0
NOTE: cache mounting group 1/0xAB385C36 (TESTDG03) succeeded
NOTE: cache ending mount (success) of group TESTDG03 number=1 incarn=0xab385c36
GMON querying group 1 at 93 for pid 13, osid 4612
Thu Jan 29 08:21:07 2015
NOTE: Instance updated compatible.asm to 11.2.0.0.0 for grp 1
SUCCESS: diskgroup TESTDG03 was mounted
SUCCESS: CREATE DISKGROUP TESTDG03 EXTERNAL REDUNDANCY DISK ‘/oracleasm/asm-disk01’ SIZE 129500M ,
‘/oracleasm/asm-disk02’ SIZE 128800M ,
‘/oracleasm/asm-disk03’ SIZE 129200M ,
‘/oracleasm/asm-disk04’ SIZE 128800M ATTRIBUTE ‘compatible.asm’=’11.2.0.0.0′,’au_size’=’1M’ /* ASMCA */
Thu Jan 29 08:21:07 2015
NOTE: diskgroup resource ora.TESTDG03.dg is online
NOTE: diskgroup resource ora.TESTDG03.dg is updated
Thu Jan 29 08:21:23 2015
SQL> alter diskgroup testdg03 add disk ‘/oracleasm/asm-disk06’
ORA-15032: not all alterations performed
ORA-15260: permission denied on ASM disk group
ERROR: alter diskgroup testdg03 add disk ‘/oracleasm/asm-disk06’
Thu Jan 29 08:21:31 2015
SQL> alter diskgroup testdg03 add disk ‘/oracleasm/asm-disk06’
NOTE: Assigning number (1,4) to disk (/oracleasm/asm-disk06)
NOTE: requesting all-instance membership refresh for group=1
NOTE: initializing header on grp 1 disk TESTDG03_0004
NOTE: requesting all-instance disk validation for group=1
Thu Jan 29 08:21:32 2015
NOTE: skipping rediscovery for group 1/0xab385c36 (TESTDG03) on local instance.
NOTE: requesting all-instance disk validation for group=1
NOTE: skipping rediscovery for group 1/0xab385c36 (TESTDG03) on local instance.
NOTE: initiating PST update: grp = 1
Thu Jan 29 08:21:32 2015
GMON updating group 1 at 94 for pid 21, osid 22706
NOTE: PST update grp = 1 completed successfully
NOTE: membership refresh pending for group 1/0xab385c36 (TESTDG03)
GMON querying group 1 at 95 for pid 13, osid 4612
NOTE: cache opening disk 4 of grp 1: TESTDG03_0004 path:/oracleasm/asm-disk06
GMON querying group 1 at 96 for pid 13, osid 4612
SUCCESS: refreshed membership for 1/0xab385c36 (TESTDG03)
SUCCESS: alter diskgroup testdg03 add disk ‘/oracleasm/asm-disk06’
NOTE: Attempting voting file refresh on diskgroup TESTDG03
Thu Jan 29 08:22:09 2015
SQL> alter diskgroup testdg03 dismount
NOTE: cache dismounting (clean) group 1/0xAB385C36 (TESTDG03)
NOTE: messaging CKPT to quiesce pins Unix process pid: 22730, image: oracle@mlab2.oracle.com (TNS V1-V3)
Thu Jan 29 08:22:10 2015
NOTE: LGWR doing clean dismount of group 1 (TESTDG03)
NOTE: LGWR closing thread 1 of diskgroup 1 (TESTDG03) at ABA 2.15
NOTE: cache dismounted group 1/0xAB385C36 (TESTDG03)
Thu Jan 29 08:22:10 2015
GMON dismounting group 1 at 97 for pid 21, osid 22730
NOTE: Disk in mode 0x8 marked for de-assignment
NOTE: Disk in mode 0x8 marked for de-assignment
NOTE: Disk in mode 0x8 marked for de-assignment
NOTE: Disk in mode 0x8 marked for de-assignment
NOTE: Disk in mode 0x8 marked for de-assignment
SUCCESS: diskgroup TESTDG03 was dismounted
NOTE: cache deleting context for group TESTDG03 1/0xab385c36
Thu Jan 29 08:22:10 2015
NOTE: diskgroup resource ora.TESTDG03.dg is offline
SUCCESS: alter diskgroup testdg03 dismount
NOTE: diskgroup resource ora.TESTDG03.dg is updated
SQL> alter diskgroup testdg03 mount
NOTE: cache registered group TESTDG03 number=1 incarn=0x83f85c5f
NOTE: cache began mount (first) of group TESTDG03 number=1 incarn=0x83f85c5f
NOTE: Assigning number (1,3) to disk (/oracleasm/asm-disk04)
NOTE: Assigning number (1,2) to disk (/oracleasm/asm-disk03)
NOTE: Assigning number (1,1) to disk (/oracleasm/asm-disk02)
NOTE: Assigning number (1,0) to disk (/oracleasm/asm-disk01)
Thu Jan 29 08:22:22 2015
NOTE: GMON heartbeating for grp 1
GMON querying group 1 at 100 for pid 21, osid 22730
Thu Jan 29 08:22:22 2015
NOTE: Assigning number (1,4) to disk ()
GMON querying group 1 at 101 for pid 21, osid 22730
NOTE: cache dismounting (clean) group 1/0x83F85C5F (TESTDG03)
NOTE: messaging CKPT to quiesce pins Unix process pid: 22730, image: oracle@mlab2.oracle.com (TNS V1-V3)
NOTE: dbwr not being msg’d to dismount
NOTE: lgwr not being msg’d to dismount
NOTE: cache dismounted group 1/0x83F85C5F (TESTDG03)
NOTE: cache ending mount (fail) of group TESTDG03 number=1 incarn=0x83f85c5f
NOTE: cache deleting context for group TESTDG03 1/0x83f85c5f
GMON dismounting group 1 at 102 for pid 21, osid 22730
NOTE: Disk in mode 0x8 marked for de-assignment
NOTE: Disk in mode 0x8 marked for de-assignment
NOTE: Disk in mode 0x8 marked for de-assignment
NOTE: Disk in mode 0x8 marked for de-assignment
NOTE: Disk in mode 0x8 marked for de-assignment
ERROR: diskgroup TESTDG03 was not mounted
ORA-15032: not all alterations performed
ORA-15040: diskgroup is incomplete
ORA-15042: ASM disk “4” is missing from group number “1”
ERROR: alter diskgroup testdg03 mount
Thu Jan 29 08:27:37 2015
SQL> alter diskgroup testdg03 mount
NOTE: cache registered group TESTDG03 number=1 incarn=0x56985c64
NOTE: cache began mount (first) of group TESTDG03 number=1 incarn=0x56985c64
NOTE: Assigning number (1,3) to disk (/oracleasm/asm-disk04)
NOTE: Assigning number (1,2) to disk (/oracleasm/asm-disk03)
NOTE: Assigning number (1,1) to disk (/oracleasm/asm-disk02)
NOTE: Assigning number (1,0) to disk (/oracleasm/asm-disk01)
Thu Jan 29 08:27:43 2015
NOTE: GMON heartbeating for grp 1
GMON querying group 1 at 105 for pid 21, osid 23017
NOTE: cache opening disk 0 of grp 1: TESTDG03_0000 path:/oracleasm/asm-disk01
NOTE: F1X0 found on disk 0 au 2 fcn 0.0
NOTE: cache opening disk 1 of grp 1: TESTDG03_0001 path:/oracleasm/asm-disk02
NOTE: cache opening disk 2 of grp 1: TESTDG03_0002 path:/oracleasm/asm-disk03
NOTE: cache opening disk 3 of grp 1: TESTDG03_0003 path:/oracleasm/asm-disk04
NOTE: cache mounting (first) external redundancy group 1/0x56985C64 (TESTDG03)
NOTE: cache recovered group 1 to fcn 0.609
NOTE: redo buffer size is 256 blocks (1053184 bytes)
Thu Jan 29 08:27:43 2015
NOTE: LGWR attempting to mount thread 1 for diskgroup 1 (TESTDG03)
NOTE: LGWR found thread 1 closed at ABA 2.15
NOTE: LGWR mounted thread 1 for diskgroup 1 (TESTDG03)
NOTE: LGWR opening thread 1 at fcn 0.609 ABA 3.16
NOTE: cache mounting group 1/0x56985C64 (TESTDG03) succeeded
NOTE: cache ending mount (success) of group TESTDG03 number=1 incarn=0x56985c64
GMON querying group 1 at 106 for pid 13, osid 4612
Thu Jan 29 08:27:43 2015
NOTE: Instance updated compatible.asm to 11.2.0.0.0 for grp 1
SUCCESS: diskgroup TESTDG03 was mounted
SUCCESS: alter diskgroup testdg03 mount
Thu Jan 29 08:27:43 2015
NOTE: diskgroup resource ora.TESTDG03.dg is online
NOTE: diskgroup resource ora.TESTDG03.dg is updated
Thu Jan 29 08:33:52 2015
SQL> alter diskgroup testdg03 check all norepair
NOTE: starting check of diskgroup TESTDG03
Thu Jan 29 08:33:52 2015
GMON checking disk 0 for group 1 at 107 for pid 21, osid 23017
GMON checking disk 1 for group 1 at 108 for pid 21, osid 23017
GMON checking disk 2 for group 1 at 109 for pid 21, osid 23017
GMON checking disk 3 for group 1 at 110 for pid 21, osid 23017
ERROR: no kfdsk for (4)
ERROR: check of diskgroup TESTDG03 found 1 total errors
ORA-15049: diskgroup “TESTDG03” contains 1 error(s)
ORA-15032: not all alterations performed
ORA-15049: diskgroup “TESTDG03” contains 1 error(s)
ERROR: alter diskgroup testdg03 check all norepair
Thu Jan 29 08:34:07 2015
SQL> alter diskgroup testdg03 check all
NOTE: starting check of diskgroup TESTDG03
Thu Jan 29 08:34:07 2015
GMON checking disk 0 for group 1 at 111 for pid 21, osid 23017
GMON checking disk 1 for group 1 at 112 for pid 21, osid 23017
GMON checking disk 2 for group 1 at 113 for pid 21, osid 23017
GMON checking disk 3 for group 1 at 114 for pid 21, osid 23017
ERROR: no kfdsk for (4)
ERROR: check of diskgroup TESTDG03 found 1 total errors
ORA-15049: diskgroup “TESTDG03” contains 1 error(s)
ORA-15032: not all alterations performed
ORA-15049: diskgroup “TESTDG03” contains 1 error(s)
ERROR: alter diskgroup testdg03 check all
SQL> alter diskgroup testdg03 check all repair
NOTE: starting check of diskgroup TESTDG03
GMON checking disk 0 for group 1 at 115 for pid 21, osid 23017
GMON checking disk 1 for group 1 at 116 for pid 21, osid 23017
GMON checking disk 2 for group 1 at 117 for pid 21, osid 23017
GMON checking disk 3 for group 1 at 118 for pid 21, osid 23017
ERROR: no kfdsk for (4)
ERROR: check of diskgroup TESTDG03 found 1 total errors
ORA-15049: diskgroup “TESTDG03” contains 1 error(s)
ORA-15032: not all alterations performed
ORA-15049: diskgroup “TESTDG03” contains 1 error(s)
ERROR: alter diskgroup testdg03 check all repair
[oracle@mlab2 oracleasm]$ oerr ora 15042
15042, 00000, “ASM disk \”%s\” is missing from group number \”%s\” ”
// *Cause: The specified disk, which is a necessary part of a diskgroup,
// could not be found on the system.
// *Action: Check the hardware configuration.
//
ORA-15042トラブルの原因はディスクを追加するときにすべてのメータデータをなくした。けど、追加したばかりのディスクが意味があるデータをまだrebalanceしていない。ASMはディスクを追加したから、そのディスクを使えるようになってから、diskgroupをmountできる。DISKGROUPはMOUNTの状態だけでディスクをドロップできるから。それについてユーザーがそのDISKを強制的にDROPできなくなったと思っている。それでループに落ちた：ディスクをドロップしたいなら、DISKGROUPをMOUNTする必要があるが、DISKGROUPをMOUNTするにはディスクをドロップ必要がある。
このトラブルに対して、ASM metadataを修正すれば避けられる。
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