分享: ASM常见错误ORA-15063: ASM discovered an insufficient number of di...
概述----------
ASM disk header是ASM disk的第一个块，即AU#0 BLOCK#0，disk header中记录了ASM disk的重要信息，比如ASM disk名字，diskgroup名字，failgroup名字，AU size等等
1. 通过视图v$asm_diskgroup和v$asm_disk查看：
select group_number,disk_number,mount_status,header_status,name,path from v$asm_disk;
GROUP_NUMBER DISK_NUMBER MOUNT_S HEADER_STATUS NAME PATH
------------ ----------- ------- --------------- -------- --------------------
1 0 CACHED MEMBER ASMDISK1 ORCL:ASMDISK1
select GROUP_NUMBER,name,state,type from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TYPE
------------ -------- -------- ------
1 DGDATA MOUNTED EXTERN
2. 通过Kfed 查看ASM disk 信息:
kfed read /dev/oracleasm/disks/ASMDISK1
kfbh.endian: 1 ; 0x000: 0x01
kfbh.hard: 130 ; 0x001: 0x82
kfbh.type: 1 ; 0x002: KFBTYP_DISKHEAD
kfbh.datfmt: 1 ; 0x003: 0x01
kfbh.block.blk: 0 ; 0x004: blk=0
kfbh.block.obj: 2147483648 ; 0x008: disk=0
kfbh.check: 2402748364 ; 0x00c: 0x8f3707cc
kfbh.fcn.base: 3580 ; 0x010: 0x00000dfc
kfbh.fcn.wrap: 0 ; 0x014: 0x00000000
kfbh.spare1: 0 ; 0x018: 0x00000000
kfbh.spare2: 0 ; 0x01c: 0x00000000
kfdhdb.driver.provstr: ORCLDISKASMDISK1 ; 0x000: length=16
kfdhdb.grptyp: 1 ; 0x026: KFDGTP_EXTERNAL
kfdhdb.hdrsts: 3 ; 0x027: KFDHDR_MEMBER
kfdhdb.dskname: ASMDISK1 ; 0x028: length=8
kfdhdb.grpname: DGDATA ; 0x048: length=6
kfdhdb.fgname: ASMDISK1 ; 0x068: length=8
kfdhdb.blksize: 4096 ; 0x0ba: 0x1000
kfdhdb.ausize: 1048576 ; 0x0bc: 0x00100000
故障处理
-------------------
1. 如果 ASM disk header损坏，那么操作这个ASM disk时会报错ORA-15063，例如：
Mount diskgorup报错ORA-15063：
SQL> alter diskgroup dgdata mount;
alter diskgroup dgdata mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15017: diskgroup "DGDATA" cannot be mounted
ORA-15063: ASM discovered an insufficient number of disks for diskgroup "DGDATA"
2. kfed检查ASM disk header，Kfed输出显示disk header的信息全部都是0，说明ASM disk header被覆盖/损坏
$ kfed read /dev/oracleasm/disks/ASMDISK1 AUNUM=0 BLKNUM=0
kfbh.endian: 0 ; 0x000: 0x00
kfbh.hard: 0 ; 0x001: 0x00
kfbh.type: 0 ; 0x002: KFBTYP_INVALID
kfbh.datfmt: 0 ; 0x003: 0x00
kfbh.block.blk: 0 ; 0x004: blk=0
kfbh.block.obj: 0 ; 0x008: file=0
kfbh.check: 0 ; 0x00c: 0x00000000
kfbh.fcn.base: 0 ; 0x010: 0x00000000
kfbh.fcn.wrap: 0 ; 0x014: 0x00000000
kfbh.spare1: 0 ; 0x018: 0x00000000
kfbh.spare2: 0 ; 0x01c: 0x00000000
7FD4F8AE1400 00000000 00000000 00000000 00000000 [................]
Repeat 255 times
KFED-00322: Invalid content encountered during block traversal: []
3.从11.1.0.7开始ASM disk header会自动备份到AU#1的倒数第二个block。对于AU size是1MB的DISKGROUP，每个AU包括block数量=1024KB/4KB=256个，因此备份信息位于AU#1的第254号block(block从0号开始)，查看ASM disk header备份信息，备份信息与ASM disk header信息完全一致：
$ kfed read /dev/oracleasm/disks/ASMDISK1 AUNUM=1 BLKNUM=254 | more
kfbh.endian: 1 ; 0x000: 0x01
kfbh.hard: 130 ; 0x001: 0x82
kfbh.type: 1 ; 0x002: KFBTYP_DISKHEAD
kfbh.datfmt: 1 ; 0x003: 0x01
kfbh.block.blk: 0 ; 0x004: blk=0
...
4.利用备份信息恢复ASM disk header：
kfed repair /dev/oracleasm/disks/ASMDISK1 aus=1048576 感谢LZ分享，一会自己做个实验加深理解！
页:
[1]