dd破坏asm磁盘头恢复---惜分飞

有朋友对asm disk的磁盘头dd了2048byte的数据
 

 

 

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通过分析,gi软件版本,确认是11.2.0.4

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Real Application Clusters and Automatic Storage Management options. ORACLE_HOME = /u01/app/11.2.0/grid System name:    Linux Node name:  rac1 Release:    4.1.12-37.4.1.el6uek.x86_64 Version:    #2 SMP Tue May 17 07:23:38 PDT 2016 Machine:    x86_64

从10.2.0.5之后版本,在第二个au的倒数第二个block上面,有asm disk header备份（每个block大小为4k）,分析au大小(通过分析正常的asm disk快速找到au 大小【使用dd备份的正常的磁盘头查看】)

H:\TEMP\tmp\asmbak>kfed read sdcp.dd |grep ausize kfdhdb.ausize:                 16777216 ; 0x0bc: 0x01000000

找到被破坏的asm disk的备份磁盘头信息

H:\TEMP\tmp\asmbak>kfed read sdc.dd blkn=4094 aun=1 aus=16777216|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:                    4094 ; 0x004: blk=4094 kfbh.block.obj:              2147483648 ;