pvcreate asm disk导致asm磁盘组异常恢复---惜分飞

标题：pvcreate asm disk导致asm磁盘组异常恢复

一客户asm磁盘组异常，无法正常mount

SQL> alter diskgroup datadg mount 2022-05-28T19:08:55.114960+08:00 NOTE: cache registered group DATADG 1/0x2B504997 NOTE: cache began mount(first) of group DATADG 1/0x2B504997 NOTE: Assigning number (1,3) to disk (/dev/oracleasm/disks/DATA05) NOTE: Assigning number (1,2) to disk (/dev/oracleasm/disks/DATA03) NOTE: Assigning number (1,1) to disk (/dev/oracleasm/disks/DATA02) 2022-05-28T19:08:55.150062+08:00 ERROR: no readquorum ingroup: required 1, found 0 disks 2022-05-28T19:08:55.150684+08:00 NOTE: cache dismounting (clean) group 1/0x2B504997(DATADG) NOTE: messaging CKPT to quiesce pins Unix process pid: 15103, image: [email protected] (TNS V1-V3) NOTE: dbwr not being msg'd to dismount NOTE: LGWR not being messaged to dismount NOTE: cache dismounted group 1/0x2B504997(DATADG) NOTE: cache ending mount(fail) of group DATADG number=1 incarn=0x2b504997 NOTE: cache deleting context forgroup DATADG 1/0x2b504997 2022-05-28T19:08:55.191073+08:00 GMON dismounting group 1 at 36 forpid 37, osid 15103 2022-05-28T19:08:55.191258+08:00 NOTE: Disk DATA02 inmode 0x8 marked forde-assignment NOTE: Disk DATA03 inmode 0x8 marked forde-assignment NOTE: Disk DATA05 inmode 0x8 marked forde-assignment ERROR: diskgroup DATADG was not mounted ORA-15032: not all alterations performed ORA-15017: diskgroup "DATADG"cannot be mounted ORA-15040: diskgroup is incomplete

通过报错信息,初步判断是由于少了asm disk导致（依据:1. ORA-15040,2.asmlib中的DATA01丢失),初步判断由于某种原因导致asmlib的磁盘异常,从而使得asm磁盘组无法正常mount,通过对dd 到本地的asm磁盘进行分析

C:\Users\XFF>kfed readH:\TEMP\asmdd\sdb6-o.dd 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 0066E8200 00000000 00000000 00000000 00000000  [................]         Repeat 31 times 0066E8400 4542414C 454E4F4C 00000001 00000000  [LABELONE........] 0066E8410 4E06D490 00000020 324D564C 31303020  [...N ...LVM2 001] 0066E8420 34535542 476A7667 42546C48 6D384675  [BUS4gvjGHlTBuF8m] 0066E8430 7A385273 4B495777 73336242 33637449  [sR8zwWIKBb3sItc3] 0066E8440 48001000 000001E8 00100000 00000000  [...H............] 0066E8450 00000000 00000000 00000000 00000000  [................] 0066E8460 00000000 00000000 00001000 00000000  [................] 0066E8470 000FF000 00000000 00000000 00000000  [................] 0066E8480 00000000 00000000 00000002 00000000  [................] 0066E8490 00000000 00000000 00000000 00000000  [................]   Repeat 214 times KFED-00322: Invalid content encountered during block traversal: [kfbtTraverseBlock][Invalid OSM block type][][0]

通过这部分信息可以确认，一个asm disk被创建了pv,进一步分析pv信息
 

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对于这样的情况，表示asm disk被创建了pv但是pv没有加入到任何vg中,也就意味着该disk没有太大破坏,通过信息确认
 

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主要是这两个部分信息被损坏,可以通过一些方法对这两个block信息进行重构

C:\Users\XFF>kfed readH:\TEMP\asmdd\sdb6.dd|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 kfbh.block.obj:              2147483648 ; 0x008: disk=0 kfbh.check:                  3196491921 ; 0x00c: 0xbe869891 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:   ORCLDISKDATA01 ; 0x000: length=14 kfdhdb.driver.reserved[0]:   1096040772 ; 0x008: 0x41544144 kfdhdb.driver.reserved[1]:        12592 ; 0x00c: 0x00003130 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:                203424000 ; 0x020: 0x0c200100 kfdhdb.dsknum:                        0 ; 0x024: 0x0000 kfdhdb.grptyp:                        1 ; 0x026: KFDGTP_EXTERNAL kfdhdb.hdrsts:                        3 ; 0x027: KFDHDR_MEMBER kfdhdb.dskname:                  DATA01 ; 0x028: length=6 kfdhdb.grpname:                  DATADG ; 0x048: length=6 kfdhdb.fgname:                   DATA01 ; 0x068: length=6 kfdhdb.capname:                         ; 0x088: length=0 kfdhdb.crestmp.hi:             33083792 ; 0x0a8: HOUR=0x10 DAYS=0xc MNTH=0x4 YEAR=0x7e3 kfdhdb.crestmp.lo:           2268043264 ; 0x0ac: USEC=0x0 MSEC=0x3e6 SECS=0x32 MINS=0x21 kfdhdb.mntstmp.hi:             33134479 ; 0x0b0: HOUR=0xf DAYS=0x1c MNTH=0x5 YEAR=0x7e6 -- More  -- C:\Users\XFF>kfed readH:\TEMP\asmdd\sdb6.ddblkn=1|more kfbh.endian:                          1 ; 0x000: 0x01 kfbh.hard:                          130 ; 0x001: 0x82 kfbh.type:                            2 ; 0x002: KFBTYP_FREESPC kfbh.datfmt:                          2 ; 0x003: 0x02 kfbh.block.blk:                       1 ; 0x004: blk=1 kfbh.block.obj:              2147483648 ; 0x008: disk=0 kfbh.check:                  2177715180 ; 0x00c: 0x81cd4bec kfbh.fcn.base:                  3721754 ; 0x010: 0x0038ca1a kfbh.fcn.wrap:                        0 ; 0x014: 0x00000000 kfbh.spare1:                          0 ; 0x018: 0x00000000 kfbh.spare2:                          0 ; 0x01c: 0x00000000 kfdfsb.aunum:                         0 ; 0x000: 0x00000000 kfdfsb.max:                        1014 ; 0x004: 0x03f6 kfdfsb.cnt:                        1014 ; 0x006: 0x03f6 kfdfsb.bound:                         0 ; 0x008: 0x0000 kfdfsb.flag:                          1 ; 0x00a: B=1 kfdfsb.ub1spare:                      0 ; 0x00b: 0x00 kfdfsb.spare[0]:                      0 ; 0x00c: 0x00000000 kfdfsb.spare[1]:                      0 ; 0x010: 0x00000000 kfdfsb.spare[2]:                      0 ; 0x014: 0x00000000 kfdfse[0].fse:                        0 ; 0x018: FREE=0x0 FRAG=0x0 kfdfse[1].fse:                        0 ; 0x019: FREE=0x0 FRAG=0x0 kfdfse[2].fse:                        0 ; 0x01a: FREE=0x0 FRAG=0x0 kfdfse[3].fse:                        0 ; 0x01b: FREE=0x0 FRAG=0x0 kfdfse[4].fse:                        0 ; 0x01c: FREE=0x0 FRAG=0x0 kfdfse[5].fse:                        0 ; 0x01d: FREE=0x0 FRAG=0x0 kfdfse[6].fse:                        0 ; 0x01e: FREE=0x0 FRAG=0x0 kfdfse[7].fse:                        0 ; 0x01f: FREE=0x0 FRAG=0x0 kfdfse[8].fse:                        0 ; 0x020: FREE=0x0 FRAG=0x0

通过dd写入到原磁盘,通过oracleasm scandisks扫描磁盘
 

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磁盘组mount成功
 

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数据库顺利open

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这个案例能够完美恢复,主要是客户没有做进一步破坏，没有把这个pv加入到vg中并且写入数据,以前有过类似案例因为写入了数据,恢复比这个难多了,效果也没有这个好asm disk被加入vg恢复
如果不幸有类似oracle asm disk被破坏(格式化,dd部分,做成lv等),需要进行恢复支持,可以联系我们,做专业的恢复评估,最大限度,最快速度抢救数据,减少损失
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