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标题：ERROR: diskgroup XXXX was not mounted

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aix平台10.2.0.5 2节点RAC，由于节点2系统盘故障，通过节点1镜像系统，复制到节点2，结果由于节点2磁盘顺序和节点1不匹配，aix工程师进行了相关操作之后,节点1重启之后datadg磁盘组无法mount

SQL> alter diskgroup datadg mount 
Mon Jun 10 23:23:46 CST 2019
NOTE: cache registered group DATADG number=1 incarn=0x8cf61164
Mon Jun 10 23:23:46 CST 2019
NOTE: Hbeat: instance first (grp 1)
Mon Jun 10 23:23:50 CST 2019
NOTE: start heartbeating (grp 1)
Mon Jun 10 23:23:50 CST 2019
NOTE: cache dismounting group 1/0x8CF61164 (DATADG) 
NOTE: dbwr not being msg'd to dismount
ERROR: diskgroup DATADG was not mounted

检查datadg磁盘组相关信息

Tue Jan 29 19:21:45 CST 2019
NOTE: start heartbeating (grp 2)
NOTE: cache opening disk 0 of grp 2: DATADG_0000 path:/dev/rhdisk6
Tue Jan 29 19:21:45 CST 2019
NOTE: F1X0 found on disk 0 fcn 0.0
NOTE: cache opening disk 1 of grp 2: DATADG_0001 path:/dev/rhdisk7
NOTE: cache opening disk 2 of grp 2: DATADG_0002 path:/dev/rhdisk8
NOTE: cache opening disk 3 of grp 2: DATADG_0003 path:/dev/rhdisk9
NOTE: cache mounting (first) group 2/0x60E59155 (DATADG)
* allocate domain 2, invalid = TRUE 
Tue Jan 29 19:21:45 CST 2019
NOTE: attached to recovery domain 2
Tue Jan 29 19:21:45 CST 2019
NOTE: cache recovered group 2 to fcn 0.849668
Tue Jan 29 19:21:45 CST 2019
NOTE: LGWR attempting to mount thread 1 for disk group 2
NOTE: LGWR mounted thread 1 for disk group 2
NOTE: opening chunk 1 at fcn 0.849668 ABA 
NOTE: seq=21 blk=5394 
Tue Jan 29 19:21:46 CST 2019
NOTE: cache mounting group 2/0x60E59155 (DATADG) succeeded
SUCCESS: diskgroup DATADG was mounted

通过这里可以看出来datadg磁盘组是由rhdisk6-9 四块磁盘组成，查询相关磁盘信息发现
asm-foreign

这里确定rhdisk7磁盘异常，通过kfed分析磁盘情况

D:\BaiduNetdiskDownload\xifenfei>kfed read rhdisk7.dd
kfbh.endian:                          0 ; 0x000: 0x00
kfbh.hard:                           34 ; 0x001: 0x22
kfbh.type:                            0 ; 0x002: KFBTYP_INVALID
kfbh.datfmt:                          0 ; 0x003: 0x00
kfbh.block.blk:                   49407 ; 0x004: blk=49407
kfbh.block.obj:                       0 ; 0x008: file=0
kfbh.check:                           0 ; 0x00c: 0x00000000
kfbh.fcn.base:                    58396 ; 0x010: 0x0000e41c
kfbh.fcn.wrap:                   131072 ; 0x014: 0x00020000
kfbh.spare1:                 4294967064 ; 0x018: 0xffffff18
kfbh.spare2:                 2105310074 ; 0x01c: 0x7d7c7b7a
005918A00 00002200 0000C0FF 00000000 00000000  [."..............]
005918A10 0000E41C 00020000 FFFFFF18 7D7C7B7A  [............z{|}]
005918A20 00000000 00000000 00000000 00000000  [................]
  Repeat 253 times
KFED-00322: Invalid content encountered during block traversal: [kfbtTraverseBlock][Invalid OSM block type][][0]

D:\BaiduNetdiskDownload\xifenfei>kfed read rhdisk7.dd blkn=1
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
006EF8A00 00000000 00000000 00000000 00000000  [................]
  Repeat 255 times
KFED-00322: Invalid content encountered during block traversal: [kfbtTraverseBlock][Invalid OSM block type][][0]

D:\BaiduNetdiskDownload\xifenfei>kfed read rhdisk7.dd blkn=2|more
kfbh.endian:                          0 ; 0x000: 0x00
kfbh.hard:                          130 ; 0x001: 0x82
kfbh.type:                            3 ; 0x002: KFBTYP_ALLOCTBL
kfbh.datfmt:                          1 ; 0x003: 0x01
kfbh.block.blk:                33554432 ; 0x004: blk=33554432
kfbh.block.obj:                16777344 ; 0x008: file=128
kfbh.check:                  3844041089 ; 0x00c: 0xe51f6981
kfbh.fcn.base:               1297484544 ; 0x010: 0x4d560b00
kfbh.fcn.wrap:                        0 ; 0x014: 0x00000000
kfbh.spare1:                          0 ; 0x018: 0x00000000
kfbh.spare2:                          0 ; 0x01c: 0x00000000
kfdatb10.aunum:                       0 ; 0x000: 0x00000000
kfdatb10.shrink:                  49153 ; 0x004: 0xc001
kfdatb10.ub2pad:                  20555 ; 0x006: 0x504b
kfdatb10.auinfo[0].link.next:      2048 ; 0x008: 0x0800
kfdatb10.auinfo[0].link.prev:      2048 ; 0x00a: 0x0800
kfdatb10.auinfo[0].free:              0 ; 0x00c: 0x0000
kfdatb10.auinfo[0].total:         49153 ; 0x00e: 0xc001
kfdatb10.auinfo[1].link.next:      4096 ; 0x010: 0x1000
kfdatb10.auinfo[1].link.prev:      4096 ; 0x012: 0x1000
kfdatb10.auinfo[1].free:              0 ; 0x014: 0x0000
kfdatb10.auinfo[1].total:             0 ; 0x016: 0x0000
kfdatb10.auinfo[2].link.next:      6144 ; 0x018: 0x1800
kfdatb10.auinfo[2].link.prev:      6144 ; 0x01a: 0x1800
kfdatb10.auinfo[2].free:              0 ; 0x01c: 0x0000
kfdatb10.auinfo[2].total:             0 ; 0x01e: 0x0000
kfdatb10.auinfo[3].link.next:      8192 ; 0x020: 0x2000
kfdatb10.auinfo[3].link.prev:      8192 ; 0x022: 0x2000
kfdatb10.auinfo[3].free:              0 ; 0x024: 0x0000

对比磁盘可能的损坏情况，由于在aix 平台asm disk的block有一个特征一般0082开头,通过工具打开磁盘,检索该标记对比
正常磁盘
0082-good

异常磁盘
0082-had
通过上述分析,大概评估rhdisk7 元数据部分损坏的不光是block 0和1,人工修复继续使用的可能性不太大,而且基于客户的数据库不大,采取方案是直接拷贝数据文件、redo、控制文件到文件系统,然后在本地文件系统open库
open_db
运气不错,实现完美恢复数据0丢失

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