接到朋友反馈说他们公司的10.2.0.4(无磁盘头备份)asm 磁盘头都损坏了，确定是被人恶意dd掉了磁盘头的1k,他通过查询发过来结果如下

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分析alert日志,确定磁盘组和磁盘信息
asm mount data磁盘组报错

Sun Apr 16 21:39:31 2017 NOTE: cache dismounting group 2/0x3F94036B (DATA) NOTE: dbwr not being msg'd to dismount ERROR: diskgroup DATA was not mounted Sun Apr 16 21:39:31 2017 ERROR: no PST quorum in group 3: required 2, found 0

data磁盘组和磁盘信息

Mon Mar 20 16:21:59 2017 NOTE: Hbeat: instance not first (grp 3) NOTE: cache opening disk 2 of grp 2: DATA_0002 path:/dev/raw/raw21 Mon Mar 20 16:21:59 2017 NOTE: F1X0 found on disk 2 fcn 0.47624333 NOTE: cache opening disk 3 of grp 2: DATA_0003 path:/dev/raw/raw22 NOTE: cache opening disk 4 of grp 2: DATA_0004 path:/dev/raw/raw23 NOTE: cache opening disk 5 of grp 2: DATA_0005 path:/dev/raw/raw24 NOTE: F1X0 found on disk 5 fcn 0.47624333 NOTE: cache opening disk 6 of grp 2: DATA_0006 path:/dev/raw/raw26 NOTE: cache opening disk 7 of grp 2: DATA_0007 path:/dev/raw/raw25 NOTE: F1X0 found on disk 7 fcn 0.47624333 NOTE: cache mounting (not first) group 2/0x01B869DC (DATA) Mon Mar 20 16:21:59 2017 kjbdomatt send to node 1 Mon Mar 20 16:21:59 2017 NOTE: attached to recovery domain 2 Mon Mar 20 16:21:59 2017 NOTE: opening chunk 2 at fcn 0.201560874 ABA NOTE: seq=614 blk=4144 Mon Mar 20 16:21:59 2017 NOTE: cache mounting group 2/0x01B869DC (DATA) succeeded SUCCESS: diskgroup DATA was mounted

最后一次正常mount是使用了raw21-raw26的裸设备为data磁盘组，但是这里从DATA_002开始,表明很可能最初了两个asm disk被删除,继续分析alert日志

Mon Oct 15 01:53:16 2012  CREATE DISKGROUP DATA Normal REDUNDANCY  DISK '/dev/raw/raw6' SIZE 1144409M , '/dev/raw/raw7' SIZE 1144409M   Sat Dec 27 22:41:39 2014  alter diskgroup data add disk '/dev/raw/raw21' Sat Dec 27 22:41:54 2014 alter diskgroup data add disk '/dev/raw/raw22' Sat Dec 27 22:42:14 2014  alter diskgroup data add disk '/dev/raw/raw23' Sat Dec 27 22:42:31 2014  alter diskgroup data add disk '/dev/raw/raw24' Sat Dec 27 22:42:51 2014  alter diskgroup data add disk '/dev/raw/raw26' Sat Dec 27 22:43:10 2014 alter diskgroup data add disk '/dev/raw/raw25' Mon Dec 29 17:55:07 2014  alter diskgroup data drop disk 'DATA_0000' Tue Dec 30 03:14:42 2014  alter diskgroup data drop disk 'DATA_0001'

kfed确认磁盘头损坏情况
通过kfed分析dd出来的磁盘头发现每个磁盘头都一样，第一个block损坏

[oracle@rac1 xifenfei]$ kfed read raw22 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 7F21AF427400 00000000 00000000 00000000 00000000  [................]   Repeat 255 times KFED-00322: Invalid content encountered during block traversal: [kfbtTraverseBlock][Invalid OSM block type][][0] [oracle@rac1 xifenfei]$ kfed read raw22 blkn=2|more kfbh.endian:                          1 ; 0x000: 0x01 kfbh.hard:                          130 ; 0x001: 0x82 kfbh.type:                            3 ; 0x002: KFBTYP_ALLOCTBL kfbh.datfmt:                          1 ; 0x003: 0x01 kfbh.block.blk:                       2 ; 0x004: blk=2 kfbh.block.obj:              2147483651 ; 0x008: disk=3 kfbh.check:                  2184525105 ; 0x00c: 0x82353531 kfbh.fcn.base:                 47625389 ; 0x010: 0x02d6b4ad kfbh.fcn.wrap:                        0 ; 0x014: 0x00000000 kfbh.spare1:                          0 ; 0x018: 0x00000000 kfbh.spare2:                          0 ; 0x01c: 0x00000000 kfdatb10.aunum:                       0 ; 0x000: 0x00000000 kfdatb10.shrink:                    448 ; 0x004: 0x01c0 kfdatb10.ub2pad:                      0 ; 0x006: 0x0000 kfdatb10.auinfo[0].link.next:         8 ; 0x008: 0x0008 kfdatb10.auinfo[0].link.prev:         8 ; 0x00a: 0x0008 kfdatb10.auinfo[0].free:              0 ; 0x00c: 0x0000 kfdatb10.auinfo[0].total:           448 ; 0x00e: 0x01c0 kfdatb10.auinfo[1].link.next:        16 ; 0x010: 0x0010 kfdatb10.auinfo[1].link.prev:        16 ; 0x012: 0x0010 kfdatb10.auinfo[1].free:              0 ; 0x014: 0x0000 kfdatb10.auinfo[1].total:             0 ; 0x016: 0x0000 kfdatb10.auinfo[2].link.next:        24 ; 0x018: 0x0018 kfdatb10.auinfo[2].link.prev:        24 ; 0x01a: 0x0018 kfdatb10.auinfo[2].free:              0 ; 0x01c: 0x0000 kfdatb10.auinfo[2].total:             0 ; 0x01e: 0x0000 kfdatb10.auinfo[3].link.next:        32 ; 0x020: 0x0020 kfdatb10.auinfo[3].link.prev:        32 ; 0x022: 0x0020

恢复思路
确定磁盘是只被干掉了第一个block，但是由于asm 是10.2.0.4的，没有asm disk header的备份，因此也只能自己去人工kfed修复.但是考虑到该case中所有的asm disk header 全部丢失，无任何参考，完全修复比较麻烦，另外这个库也比较小，考虑修复asm disk header 关键部位，然后通过工具直接拷贝出来数据文件，在文件系统中open库的思路.主要需要恢复磁盘头基本信息(diskname，disksize，disknum，ausize，blocksize，file directory等）

通过kfed找出来file directory

kfbh.endian:                          1 ; 0x000: 0x01 kfbh.hard:                          130 ; 0x001: 0x82 kfbh.type:                            4 ; 0x002: KFBTYP_FILEDIR kfbh.datfmt:                          1 ; 0x003: 0x01 kfbh.block.blk:                       2 ; 0x004: blk=2 kfbh.block.obj:                       1 ; 0x008: file=1 kfbh.check:                  2363360058 ; 0x00c: 0x8cde033a kfbh.fcn.base:                 48245591 ; 0x010: 0x02e02b57 kfbh.fcn.wrap:                        0 ; 0x014: 0x00000000 kfbh.spare1:                          0 ; 0x018: 0x00000000 kfbh.spare2:                          0 ; 0x01c: 0x00000000 kfffdb.node.incarn:                   1 ; 0x000: A=1 NUMM=0x0 kfffdb.node.frlist.number:   4294967295 ; 0x004: 0xffffffff kfffdb.node.frlist.incarn:            0 ; 0x008: A=0 NUMM=0x0 kfffdb.hibytes:                       0 ; 0x00c: 0x00000000 kfffdb.lobytes:                 1048576 ; 0x010: 0x00100000 kfffdb.xtntcnt:                       3 ; 0x014: 0x00000003 kfffdb.xtnteof:                       3 ; 0x018: 0x00000003 kfffdb.blkSize:                    4096 ; 0x01c: 0x00001000 kfffdb.flags:                        65 ; 0x020: O=1 S=0 S=0 D=0 C=0 I=0 R=1 A=0 kfffdb.fileType:                     15 ; 0x021: 0x0f kfffdb.dXrs:                         19 ; 0x022: SCHE=0x1 NUMB=0x3

通过kfed找出来disk directory

kfffde[0].xptr.au:                    4 ; 0x4a0: 0x00000004 kfffde[0].xptr.disk:                  7 ; 0x4a4: 0x0007 kfffde[0].xptr.flags:                 0 ; 0x4a6: L=0 E=0 D=0 S=0 kfffde[0].xptr.chk:                  41 ; 0x4a7: 0x29 kfffde[1].xptr.au:                17405 ; 0x4a8: 0x000043fd kfffde[1].xptr.disk:                  6 ; 0x4ac: 0x0006 kfffde[1].xptr.flags:                 0 ; 0x4ae: L=0 E=0 D=0 S=0 kfffde[1].xptr.chk:                 146 ; 0x4af: 0x92 kfffde[2].xptr.au:               330031 ; 0x4b0: 0x0005092f kfffde[2].xptr.disk:                  4 ; 0x4b4: 0x0004 kfffde[2].xptr.flags:                 0 ; 0x4b6: L=0 E=0 D=0 S=0 kfffde[2].xptr.chk:                  13 ; 0x4b7: 0x0d kfddde[2].entry.incarn:               1 ; 0x3a4: A=1 NUMM=0x0 kfddde[2].entry.hash:                 2 ; 0x3a8: 0x00000002 kfddde[2].entry.refer.number:4294967295 ; 0x3ac: 0xffffffff kfddde[2].entry.refer.incarn:         0 ; 0x3b0: A=0 NUMM=0x0 kfddde[2].dsknum:                     2 ; 0x3b4: 0x0002 kfddde[2].state:                      2 ; 0x3b6: KFDSTA_NORMAL kfddde[2].ddchgfl:                    0 ; 0x3b7: 0x00 kfddde[2].dskname:            DATA_0002 ; 0x3b8: length=9 kfddde[2].fgname:             DATA_0002 ; 0x3d8: length=9 kfddde[2].crestmp.hi:          33010550 ; 0x3f8: HOUR=0x16 DAYS=0x1b MNTH=0xc YEAR=0x7de kfddde[2].crestmp.lo:        2793310208 ; 0x3fc: USEC=0x0 MSEC=0x3a2 SECS=0x27 MINS=0x29 kfddde[2].failstmp.hi:                0 ; 0x400: HOUR=0x0 DAYS=0x0 MNTH=0x0 YEAR=0x0 kfddde[2].failstmp.lo:                0 ; 0x404: USEC=0x0 MSEC=0x0 SECS=0x0 MINS=0x0 kfddde[2].timer:                      0 ; 0x408: 0x00000000 kfddde[2].size:                 1258291 ; 0x40c: 0x00133333 kfddde[2].srRloc.super.hiStart:       0 ; 0x410: 0x00000000 kfddde[2].srRloc.super.loStart:       0 ; 0x414: 0x00000000 kfddde[2].srRloc.super.length:        0 ; 0x418: 0x00000000 kfddde[2].srRloc.incarn:              0 ; 0x41c: 0x00000000 kfddde[2].dskrprtm:                   0 ; 0x420: 0x00000000 kfddde[2].start0:                     0 ; 0x424: 0x00000000 kfddde[2].size0:                1258291 ; 0x428: 0x00133333 kfddde[2].used0:                1258229 ; 0x42c: 0x001332f5 kfddde[2].slot:                       0 ; 0x430: 0x00000000 kfddde[3].entry.incarn:               1 ; 0x564: A=1 NUMM=0x0 kfddde[3].entry.hash:                 3 ; 0x568: 0x00000003 kfddde[3].entry.refer.number:4294967295 ; 0x56c: 0xffffffff kfddde[3].entry.refer.incarn:         0 ; 0x570: A=0 NUMM=0x0 kfddde[3].dsknum:                     3 ; 0x574: 0x0003 kfddde[3].state:                      2 ; 0x576: KFDSTA_NORMAL kfddde[3].ddchgfl:                    0 ; 0x577: 0x00 kfddde[3].dskname:            DATA_0003 ; 0x578: length=9 kfddde[3].fgname:             DATA_0003 ; 0x598: length=9 kfddde[3].crestmp.hi:          33010550 ; 0x5b8: HOUR=0x16 DAYS=0x1b MNTH=0xc YEAR=0x7de kfddde[3].crestmp.lo:        2811397120 ; 0x5bc: USEC=0x0 MSEC=0xa1 SECS=0x39 MINS=0x29 kfddde[3].failstmp.hi:                0 ; 0x5c0: HOUR=0x0 DAYS=0x0 MNTH=0x0 YEAR=0x0 kfddde[3].failstmp.lo:                0 ; 0x5c4: USEC=0x0 MSEC=0x0 SECS=0x0 MINS=0x0 kfddde[3].timer:                      0 ; 0x5c8: 0x00000000 kfddde[3].size:                 1258291 ; 0x5cc: 0x00133333 kfddde[3].srRloc.super.hiStart:       0 ; 0x5d0: 0x00000000 kfddde[3].srRloc.super.loStart:       0 ; 0x5d4: 0x00000000 kfddde[3].srRloc.super.length:        0 ; 0x5d8: 0x00000000 kfddde[3].srRloc.incarn:              0 ; 0x5dc: 0x00000000 kfddde[3].dskrprtm:                   0 ; 0x5e0: 0x00000000 kfddde[3].start0:                     0 ; 0x5e4: 0x00000000 kfddde[3].size0:                1258291 ; 0x5e8: 0x00133333 kfddde[3].used0:                1258128 ; 0x5ec: 0x00133290 kfddde[3].slot:                       0 ; 0x5f0: 0x00000000 kfddde[4].entry.incarn:               1 ; 0x724: A=1 NUMM=0x0 kfddde[4].entry.hash:                 4 ; 0x728: 0x00000004 kfddde[4].entry.refer.number:4294967295 ; 0x72c: 0xffffffff kfddde[4].entry.refer.incarn:         0 ; 0x730: A=0 NUMM=0x0 kfddde[4].dsknum:                     4 ; 0x734: 0x0004 kfddde[4].state:                      2 ; 0x736: KFDSTA_NORMAL kfddde[4].ddchgfl:                    0 ; 0x737: 0x00 kfddde[4].dskname:            DATA_0004 ; 0x738: length=9 kfddde[4].fgname:             DATA_0004 ; 0x758: length=9 kfddde[4].crestmp.hi:          33010550 ; 0x778: HOUR=0x16 DAYS=0x1b MNTH=0xc YEAR=0x7de kfddde[4].crestmp.lo:        2834565120 ; 0x77c: USEC=0x0 MSEC=0x102 SECS=0xf MINS=0x2a kfddde[4].failstmp.hi:                0 ; 0x780: HOUR=0x0 DAYS=0x0 MNTH=0x0 YEAR=0x0 kfddde[4].failstmp.lo:                0 ; 0x784: USEC=0x0 MSEC=0x0 SECS=0x0 MINS=0x0 kfddde[4].timer:                      0 ; 0x788: 0x00000000 kfddde[4].size:                 1258291 ; 0x78c: 0x00133333 kfddde[4].srRloc.super.hiStart:       0 ; 0x790: 0x00000000 kfddde[4].srRloc.super.loStart:       0 ; 0x794: 0x00000000 kfddde[4].srRloc.super.length:        0 ; 0x798: 0x00000000 kfddde[4].srRloc.incarn:              0 ; 0x79c: 0x00000000 kfddde[4].dskrprtm:                   0 ; 0x7a0: 0x00000000 kfddde[4].start0:                     0 ; 0x7a4: 0x00000000 kfddde[4].size0:                1258291 ; 0x7a8: 0x00133333 kfddde[4].used0:                1258291 ; 0x7ac: 0x00133333 kfddde[4].slot:                       0 ; 0x7b0: 0x00000000 kfddde[5].entry.incarn:               1 ; 0x8e4: A=1 NUMM=0x0 kfddde[5].entry.hash:                 5 ; 0x8e8: 0x00000005 kfddde[5].entry.refer.number:4294967295 ; 0x8ec: 0xffffffff kfddde[5].entry.refer.incarn:         0 ; 0x8f0: A=0 NUMM=0x0 kfddde[5].dsknum:                     5 ; 0x8f4: 0x0005 kfddde[5].state:                      2 ; 0x8f6: KFDSTA_NORMAL kfddde[5].ddchgfl:                    0 ; 0x8f7: 0x00 kfddde[5].dskname:            DATA_0005 ; 0x8f8: length=9 kfddde[5].fgname:             DATA_0005 ; 0x918: length=9 kfddde[5].crestmp.hi:          33010550 ; 0x938: HOUR=0x16 DAYS=0x1b MNTH=0xc YEAR=0x7de kfddde[5].crestmp.lo:        2853560320 ; 0x93c: USEC=0x0 MSEC=0x178 SECS=0x21 MINS=0x2a kfddde[5].failstmp.hi:                0 ; 0x940: HOUR=0x0 DAYS=0x0 MNTH=0x0 YEAR=0x0 kfddde[5].failstmp.lo:                0 ; 0x944: USEC=0x0 MSEC=0x0 SECS=0x0 MINS=0x0 kfddde[5].timer:                      0 ; 0x948: 0x00000000 kfddde[5].size:                 1258291 ; 0x94c: 0x00133333 kfddde[5].srRloc.super.hiStart:       0 ; 0x950: 0x00000000 kfddde[5].srRloc.super.loStart:       0 ; 0x954: 0x00000000 kfddde[5].srRloc.super.length:        0 ; 0x958: 0x00000000 kfddde[5].srRloc.incarn:              0 ; 0x95c: 0x00000000 kfddde[5].dskrprtm:                   0 ; 0x960: 0x00000000 kfddde[5].start0:                     0 ; 0x964: 0x00000000 kfddde[5].size0:                1258291 ; 0x968: 0x00133333 kfddde[5].used0:                1258255 ; 0x96c: 0x0013330f kfddde[5].slot:                       0 ; 0x970: 0x00000000 kfddde[6].entry.incarn:               1 ; 0xaa4: A=1 NUMM=0x0 kfddde[6].entry.hash:                 6 ; 0xaa8: 0x00000006 kfddde[6].entry.refer.number:4294967295 ; 0xaac: 0xffffffff kfddde[6].entry.refer.incarn:         0 ; 0xab0: A=0 NUMM=0x0 kfddde[6].dsknum:                     6 ; 0xab4: 0x0006 kfddde[6].state:                      2 ; 0xab6: KFDSTA_NORMAL kfddde[6].ddchgfl:                    0 ; 0xab7: 0x00 kfddde[6].dskname:            DATA_0006 ; 0xab8: length=9 kfddde[6].fgname:             DATA_0006 ; 0xad8: length=9 kfddde[6].crestmp.hi:          33010550 ; 0xaf8: HOUR=0x16 DAYS=0x1b MNTH=0xc YEAR=0x7de kfddde[6].crestmp.lo:        2875645952 ; 0xafc: USEC=0x0 MSEC=0x1b8 SECS=0x36 MINS=0x2a kfddde[6].failstmp.hi:                0 ; 0xb00: HOUR=0x0 DAYS=0x0 MNTH=0x0 YEAR=0x0 kfddde[6].failstmp.lo:                0 ; 0xb04: USEC=0x0 MSEC=0x0 SECS=0x0 MINS=0x0 kfddde[6].timer:                      0 ; 0xb08: 0x00000000 kfddde[6].size:                 1258291 ; 0xb0c: 0x00133333 kfddde[6].srRloc.super.hiStart:       0 ; 0xb10: 0x00000000 kfddde[6].srRloc.super.loStart:       0 ; 0xb14: 0x00000000 kfddde[6].srRloc.super.length:        0 ; 0xb18: 0x00000000 kfddde[6].srRloc.incarn:              0 ; 0xb1c: 0x00000000 kfddde[6].dskrprtm:                   0 ; 0xb20: 0x00000000 kfddde[6].start0:                     0 ; 0xb24: 0x00000000 kfddde[6].size0:                1258291 ; 0xb28: 0x00133333 kfddde[6].used0:                1258247 ; 0xb2c: 0x00133307 kfddde[6].slot:                       0 ; 0xb30: 0x00000000 kfddde[7].entry.incarn:               1 ; 0xc64: A=1 NUMM=0x0 kfddde[7].entry.hash:                 7 ; 0xc68: 0x00000007 kfddde[7].entry.refer.number:4294967295 ; 0xc6c: 0xffffffff kfddde[7].entry.refer.incarn:         0 ; 0xc70: A=0 NUMM=0x0 kfddde[7].dsknum:                     7 ; 0xc74: 0x0007 kfddde[7].state:                      2 ; 0xc76: KFDSTA_NORMAL kfddde[7].ddchgfl:                    0 ; 0xc77: 0x00 kfddde[7].dskname:            DATA_0007 ; 0xc78: length=9 kfddde[7].fgname:             DATA_0007 ; 0xc98: length=9 kfddde[7].crestmp.hi:          33010550 ; 0xcb8: HOUR=0x16 DAYS=0x1b MNTH=0xc YEAR=0x7de kfddde[7].crestmp.lo:        2898849792 ; 0xcbc: USEC=0x0 MSEC=0x23c SECS=0xc MINS=0x2b kfddde[7].failstmp.hi:                0 ; 0xcc0: HOUR=0x0 DAYS=0x0 MNTH=0x0 YEAR=0x0 kfddde[7].failstmp.lo:                0 ; 0xcc4: USEC=0x0 MSEC=0x0 SECS=0x0 MINS=0x0 kfddde[7].timer:                      0 ; 0xcc8: 0x00000000 kfddde[7].size:                 1258291 ; 0xccc: 0x00133333 kfddde[7].srRloc.super.hiStart:       0 ; 0xcd0: 0x00000000 kfddde[7].srRloc.super.loStart:       0 ; 0xcd4: 0x00000000 kfddde[7].srRloc.super.length:        0 ; 0xcd8: 0x00000000 kfddde[7].srRloc.incarn:              0 ; 0xcdc: 0x00000000 kfddde[7].dskrprtm:                   0 ; 0xce0: 0x00000000 kfddde[7].start0:                     0 ; 0xce4: 0x00000000 kfddde[7].size0:                1258291 ; 0xce8: 0x00133333 kfddde[7].used0:                1258209 ; 0xcec: 0x001332e1 kfddde[7].slot:                       0 ; 0xcf0: 0x00000000

结合上述信息构造类似磁盘头文件

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: T=0 NUMB=0x0 kfbh.block.obj:              2147483648 ; 0x008: TYPE=0x8 NUMB=0x0 kfbh.check:                  3123334821 ; 0x00c: 0xba2a4ea5 kfbh.fcn.base:                        0 ; 0x010: 0x00000000 kfbh.fcn.wrap:                        0 ; 0x014: 0x00000000 kfbh.spare1:                          0 ; 0x018: 0x00000000 kfbh.spare2:                          0 ; 0x01c: 0x00000000 kfdhdb.driver.provstr:     ORCLDISKVOL2 ; 0x000: length=12 kfdhdb.driver.reserved[0]:    827084630 ; 0x008: 0x314c4f56 kfdhdb.driver.reserved[1]:            0 ; 0x00c: 0x00000000 kfdhdb.driver.reserved[2]:            0 ; 0x010: 0x00000000 kfdhdb.driver.reserved[3]:            0 ; 0x014: 0x00000000 kfdhdb.driver.reserved[4]:            0 ; 0x018: 0x00000000 kfdhdb.driver.reserved[5]:            0 ; 0x01c: 0x00000000 kfdhdb.compat:                168820736 ; 0x020: 0x0a100000 kfdhdb.dsknum:                        2 ; 0x024: 0x0002 kfdhdb.grptyp:                        1 ; 0x026: KFDGTP_NORMAL kfdhdb.hdrsts:                        3 ; 0x027: KFDHDR_MEMBER kfdhdb.dskname:               DATA_0002 ; 0x028: length=9 kfdhdb.grpname:                    DATA ; 0x048: length=4 kfdhdb.fgname:                DATA_0002 ; 0x068: length=9 kfdhdb.capname:                         ; 0x088: length=0 kfdhdb.crestmp.hi:             33010550 ; 0x3f8: HOUR=0x16 DAYS=0x1b MNTH=0xc YEAR=0x7de kfdhdb.crestmp.lo:           2793310208 ; 0x3fc: USEC=0x0 MSEC=0x3a2 SECS=0x27 MINS=0x29 kfdhdb.mntstmp.hi:             33049840 ; 0x0b0: HOUR=0x10 DAYS=0x7 MNTH=0x3 YEAR=0x7e1 kfdhdb.mntstmp.lo:           1588567040 ; 0x0b4: USEC=0x0 MSEC=0x3e7 SECS=0x2a MINS=0x17 kfdhdb.secsize:                     512 ; 0x0b8: 0x0200 kfdhdb.blksize:                    4096 ; 0x0ba: 0x1000 kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000 kfdhdb.mfact:                    113792 ; 0x0c0: 0x0001bc80 kfdhdb.dsksize:                 1258291 ; 0x40c: 0x00133333 kfdhdb.pmcnt:                        19 ; 0x0c8: 0x00000013 kfdhdb.fstlocn:                       1 ; 0x0cc: 0x00000001 kfdhdb.altlocn:                       2 ; 0x0d0: 0x00000002 kfdhdb.f1b1locn:                      2 ; 0x0d4: 0x00000002

然后通过kfed merge分别对所有磁盘头进行重构，然后通过dul去识别拷贝文件

+DATA/XFF/spfileXFF.ora.265.869858859 +DATA/XFF/CONTROLFILE/Current.256.796701475 +DATA/XFF/ONLINELOG/group_1.257.796701475 +DATA/XFF/ONLINELOG/group_2.258.796701485 +DATA/XFF/ONLINELOG/group_3.266.796704261 +DATA/XFF/ONLINELOG/group_4.267.796704277 +DATA/XFF/ONLINELOG/group_5.1235.824131117 +DATA/XFF/ONLINELOG/group_6.1115.824200515 +DATA/XFF/ONLINELOG/group_7.1113.824200587 +DATA/XFF/ONLINELOG/group_8.1112.824200627 +DATA/XFF/ONLINELOG/group_9.1066.824201189 +DATA/XFF/ONLINELOG/group_10.1063.824201207 +DATA/XFF/ONLINELOG/group_11.1062.824201287 +DATA/XFF/ONLINELOG/group_12.1061.824201301 File 259 datafile size 2147491840, block size 8192 File 260 datafile size 32186048512, block size 8192 File 261 datafile size 6897541120, block size 8192 File 263 datafile size 27409784832, block size 8192 File 264 datafile size 34359730176, block size 8192 File 280 datafile size 31457288192, block size 8192 File 281 datafile size 31457288192, block size 8192 File 330 datafile size 5242888192, block size 8192 File 334 datafile size 20971528192, block size 8192 File 382 datafile size 20971528192, block size 8192 File 383 datafile size 20971528192, block size 8192 File 384 datafile size 31457288192, block size 8192 File 385 datafile size 31457288192, block size 8192 File 386 datafile size 31457288192, block size 8192 File 387 datafile size 4294975488, block size 8192 File 388 datafile size 4294975488, block size 8192 File 389 datafile size 4294975488, block size 8192 File 390 datafile size 4294975488, block size 8192 File 391 datafile size 4294975488, block size 8192 File 392 datafile size 4294975488, block size 8192 File 394 datafile size 31457288192, block size 8192 File 491 datafile size 20971528192, block size 8192 File 494 datafile size 20971528192, block size 8192 File 578 datafile size 31457288192, block size 8192 File 597 datafile size 20971528192, block size 8192 File 613 datafile size 4294975488, block size 8192 File 638 datafile size 31457288192, block size 8192 File 668 datafile size 16988184576, block size 8192 File 688 datafile size 20971528192, block size 8192 File 740 datafile size 31457288192, block size 8192 File 787 datafile size 31457288192, block size 8192 File 798 datafile size 31457288192, block size 8192 File 806 datafile size 31457288192, block size 8192 File 810 datafile size 31457288192, block size 8192 File 845 datafile size 31457288192, block size 8192 File 886 datafile size 31457288192, block size 8192 File 887 datafile size 31457288192, block size 8192 File 889 datafile size 31457288192, block size 8192 File 892 datafile size 31457288192, block size 8192 File 903 datafile size 31457288192, block size 8192 File 932 datafile size 31457288192, block size 8192 File 933 datafile size 3145736192, block size 8192 File 951 datafile size 20971528192, block size 8192 File 953 datafile size 31457288192, block size 8192 File 955 datafile size 31457288192, block size 8192 File 963 datafile size 31457288192, block size 8192 File 1000 datafile size 31457288192, block size 8192 File 1001 datafile size 12035563520, block size 8192 File 1031 datafile size 31457288192, block size 8192 File 1033 datafile size 31457288192, block size 8192 File 1035 datafile size 31457288192, block size 8192 File 1037 datafile size 31457288192, block size 8192 File 1045 datafile size 31457288192, block size 8192 File 1073 datafile size 4294975488, block size 8192 File 1074 datafile size 4294975488, block size 8192 File 1075 datafile size 4294975488, block size 8192 File 1076 datafile size 8589942784, block size 8192 File 1077 datafile size 31457288192, block size 8192 File 1078 datafile size 8589942784, block size 8192 File 1079 datafile size 8589942784, block size 8192 File 1080 datafile size 4294975488, block size 8192 File 1081 datafile size 8589942784, block size 8192 File 1082 datafile size 8589942784, block size 8192 File 1083 datafile size 8589942784, block size 8192 File 1084 datafile size 8589942784, block size 8192 File 1085 datafile size 32365355008, block size 8192 File 1086 datafile size 9071239168, block size 8192 File 1116 datafile size 8589942784, block size 8192 File 1133 datafile size 8589942784, block size 8192 File 1219 datafile size 31457288192, block size 8192 File 1245 datafile size 31457288192, block size 8192 File 1249 datafile size 31457288192, block size 8192 File 1251 datafile size 31457288192, block size 8192 File 1322 datafile size 4294975488, block size 8192 File 1442 datafile size 31457288192, block size 8192 File 1468 datafile size 1048584192, block size 8192 File 1508 datafile size 31457288192, block size 8192 File 1554 datafile size 4294975488, block size 8192 File 1570 datafile size 31457288192, block size 8192 File 2004 datafile size 31457288192, block size 8192 File 2005 datafile size 31457288192, block size 8192 File 2344 datafile size 31457288192, block size 8192 File 2345 datafile size 31457288192, block size 8192 File 2348 datafile size 31457288192, block size 8192 File 2617 datafile size 10737426432, block size 8192 File 2618 datafile size 21474844672, block size 8192 File 2766 datafile size 33554440192, block size 8192 File 2782 datafile size 31457288192, block size 8192 File 2784 datafile size 31457288192, block size 8192 File 2893 datafile size 31457288192, block size 8192 File 2924 datafile size 31457288192, block size 8192 File 2925 datafile size 31457288192, block size 8192 File 2926 datafile size 31457288192, block size 8192 File 2983 datafile size 31457288192, block size 8192 File 2984 datafile size 31457288192, block size 8192 File 3634 datafile size 31457288192, block size 8192 File 3909 datafile size 31457288192, block size 8192 File 3917 datafile size 31457288192, block size 8192 File 3920 datafile size 31457288192, block size 8192 File 3922 datafile size 31457288192, block size 8192

剩下的事情就比较简单了，通过把spfile,controlfile，datafile文件拷贝出来，本地启动数据库，恢复成功

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原文：asm磁盘头全部损坏数据0丢失恢复

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