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标题：误删除asm disk导致磁盘组无法mount数据库恢复

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

客户误删除asm disk两个lun（由于这个是这个存储的特殊性,删除lun之后,存储层面无法恢复出来对应的lun数据,导致客户彻底放弃了硬件层面恢复的可能性.）,导致asm磁盘组无法正常mount

SQL> ALTER DISKGROUP DATA MOUNT  /* asm agent *//* {1:27928:40938} */ 
NOTE: cache registered group DATA number=3 incarn=0x60fa38b1
NOTE: cache began mount (first) of group DATA number=3 incarn=0x60fa38b1
NOTE: Assigning number (3,0) to disk (/dev/rdisk/VD02_DBF)
NOTE: Assigning number (3,1) to disk (/dev/rdisk/VD03_DBF)
NOTE: Assigning number (3,2) to disk (/dev/rdisk/VD04_DBF)
NOTE: Assigning number (3,3) to disk (/dev/rdisk/VD05_DBF)
NOTE: Assigning number (3,4) to disk (/dev/rdisk/VD06_DBF)
Thu Dec 29 10:21:20 2022
NOTE: GMON heartbeating for grp 3
GMON querying group 3 at 29 for pid 29, osid 3770
NOTE: Assigning number (3,5) to disk ()
NOTE: Assigning number (3,6) to disk ()
GMON querying group 3 at 30 for pid 29, osid 3770
NOTE: cache dismounting (clean) group 3/0x60FA38B1 (DATA) 
NOTE: messaging CKPT to quiesce pins Unix process pid: 3770, image: oracle@db1 (TNS V1-V3)
NOTE: dbwr not being msg'd to dismount
NOTE: lgwr not being msg'd to dismount
NOTE: cache dismounted group 3/0x60FA38B1 (DATA) 
NOTE: cache ending mount (fail) of group DATA number=3 incarn=0x60fa38b1
NOTE: cache deleting context for group DATA 3/0x60fa38b1
GMON dismounting group 3 at 31 for pid 29, osid 3770
NOTE: Disk DATA_0000 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0001 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0002 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0003 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0004 in mode 0x7f marked for de-assignment
NOTE: Disk  in mode 0x7f marked for de-assignment
NOTE: Disk  in mode 0x7f marked for de-assignment
ERROR: diskgroup DATA was not mounted
ORA-15032: not all alterations performed
ORA-15040: diskgroup is incomplete
ORA-15042: ASM disk "6" is missing from group number "3" 
ORA-15042: ASM disk "5" is missing from group number "3" 
ERROR: ALTER DISKGROUP DATA MOUNT  /* asm agent *//* {1:27928:40938} */

这个客户应该有三个磁盘组存放数据文件,其中data磁盘组的7个磁盘被删除了2个lun,导致data磁盘组无法mount,客户希望尽可能恢复其中数据,对于这种情况,由于2个lun完全丢失,直接通过dul之类的工具拷贝asm数据文件恢复不可行(因为很多asm的元数据也会在丢失的lun里面,导致拷贝出来的数据文件异常太多,恢复效果会很差),对于这种情况采用asm disk header 彻底损坏恢复的恢复方法,尽可能的从block层面恢复出来所有可以恢复的数据块中的数据

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标题：再一起asm disk被格式化成ext3文件系统故障恢复

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

国庆节前夕接到朋友求救电话asm disk被格式化成ext3格式了,具体操作如下

Sun Sep 29 18:15:02 2019
Errors in file /u01/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_b000_8094.trc:
ORA-15025: could not open disk "/dev/asmdisk/sdh"
ORA-27041: unable to open file
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Errors in file /u01/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_b000_8094.trc:
ORA-15025: could not open disk "/dev/asmdisk/sdh"
ORA-27041: unable to open file
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
WARNING: cache failed reading from group=1(DATA) fn=9 blk=0 count=1 from 
disk= 5 (DATA_0005) kfkist=0x20 status=0x02 osderr=0x0 file=kfc.c line=11596
Errors in file /u01/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_b000_8094.trc:
ORA-15025: could not open disk "/dev/asmdisk/sdh"
ORA-27041: unable to open file
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
ORA-15080: synchronous I/O operation to a disk failed
WARNING: cache succeeded reading from group=1(DATA) fn=9 blk=0 count=1 from 
disk= 7 (DATA_0007) kfkist=0x20 status=0x01 osderr=0x0 file=kfc.c line=11637
Errors in file /u01/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_b000_8094.trc:
ORA-15025: could not open disk "/dev/asmdisk/sdh"
ORA-27041: unable to open file
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
WARNING: PST-initiated drop of 1 disk(s) in group 1(.2380027701))

重启系统之后,重试mount 磁盘组

GMON dismounting group 1 at 18 for pid 31, osid 44279
NOTE: Disk DATA_0000 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0001 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0002 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0003 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0004 in mode 0x1 marked for de-assignment
NOTE: Disk DATA_0005 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0006 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0007 in mode 0x7f marked for de-assignment
NOTE: Disk  in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0009 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0010 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0011 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0012 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0013 in mode 0x7f marked for de-assignment
NOTE: Disk DATA_0014 in mode 0x7f marked for de-assignment
ERROR: diskgroup DATA was not mounted
ORA-15032: not all alterations performed
ORA-15040: diskgroup is incomplete
ORA-15042: ASM disk "8" is missing from group number "1" 
ERROR: ALTER DISKGROUP DATA MOUNT  /* asm agent *//* {1:2587:2} */

由于sdb（asm disk 8）被格式化,导致data磁盘组无法正常mount.这个客户运气比较好data 磁盘组是normal模式,但是由于mount到/,导致disk 4被强制drop,因此无法mount成功,但是通过一系列处理数据实现完美恢复,0数据丢失