Method of backup and recovery of ASM DISK HEADER in Oracle

Recently encountered a number of ASM data header problems caused disk GROUP can not be normal mount, the database is not working properly, has brought endless trouble, this time thinking, if I did the ASM data header backup How good ah, unfortunately there is no regret medicine, We recommend that you check your own ASM library, ASM HEADER has done a backup, if not please handle it in time. Here the test provides DD and kfed backup and restore ASM headers
Query ASM Related Information

The code is as follows

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Sql> select Group_number,name,state,total_mb,free_mb from V$asm_diskgroup; Group_number NAME State TOTAL_MB FREE_MB ------------ ------------------------------ ---------- ---------- ---------- 1 DATA Mounted 2046 1314 2 Xifenfei mounted 6141 4378 Sql> select Group_number,disk_number,path,state from V$asm_disk; Group_number Disk_number PATH State ------------ ----------- ------------------------------ ---------------- 1 1/dev/oracleasm/disks/vol2 NORMAL 1 0/dev/oracleasm/disks/vol1 NORMAL 2 1/dev/oracleasm/disks/vol4 NORMAL 2 0/dev/oracleasm/disks/vol3 NORMAL

Find the ASM disk corresponding to the partition

The code is as follows

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[Grid@rac1 ~]$/etc/init.d/oracleasm querydisk-d VOL1 Disk "VOL1" is a valid ASM disk on device [8,33] [Grid@rac1 ~]$ Ll/dev |grep 8|grep 33 Brw-r-----1 Root disk 8, APR 11:37 SDC1 [Grid@rac1 ~]$/etc/init.d/oracleasm querydisk-d VOL2 Disk "VOL2" is a valid ASM disk on device [8,34] [Grid@rac1 ~]$ Ll/dev |grep 8|grep 34 Brw-r-----1 Root disk 8, APR 11:37 SDC2 [Grid@rac1 ~]$/etc/init.d/oracleasm querydisk-d VOL3 Disk "VOL3" is a valid ASM disk on device [8,17] [Grid@rac1 ~]$ ll/dev |grep 8,|grep 17 Brw-r-----1 Root disk 8, APR 11:37 SDB1 [Grid@rac1 ~]$/etc/init.d/oracleasm querydisk-d VOL4 Disk "VOL4" is a valid ASM disk on device [8,18] [Grid@rac1 ~]$ Ll/dev |grep 8,|grep 18 Brw-r-----1 Root disk 8, APR 11:37 SDB2

Back Up ASM header information (Backup Xifenfei disk group)

The code is as follows

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--DD Mode Backup [Root@rac1 backup_asmheader]# dd if=/dev/sdb1 of=vol3header.dd bs=4096 count=1 1+0 Records in 1+0 Records out 4096 bytes (4.1 kB) copied, 0.000143581 seconds, 28.5 MB/s [Root@rac1 backup_asmheader]# dd if=/dev/sdb2 of=vol4header.dd bs=4096 count=1 1+0 Records in 1+0 Records out 4096 bytes (4.1 kB) copied, 0.000147727 seconds, 27.7 MB/s --kfed Mode Backup [Grid@rac1 backup_asmheader]$ kfed read/dev/oracleasm/disks/vol3 text=vol3header.txt [Grid@rac1 backup_asmheader]$ more Vol3header.txt 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:198826195; 0x00c:0x0bd9d8d3 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:ORCLDISKVOL3; 0x000:length=12 Kfdhdb.driver.reserved[0]: 860639062; 0x008:0x334c4f56 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:186646528; 0x020:0x0b200000 kfdhdb.dsknum:0; 0x024:0x0000 Kfdhdb.grptyp:1; 0x026:kfdgtp_external Kfdhdb.hdrsts:3; 0x027:kfdhdr_member kfdhdb.dskname:XIFENFEI_0000; 0x028:length=13 Kfdhdb.grpname:XIFENFEI; 0x048:length=8 kfdhdb.fgname:XIFENFEI_0000; 0x068:length=13 Kfdhdb.capname:; 0x088:length=0 kfdhdb.crestmp.hi:32967790; 0x0a8:hour=0xe days=0x3 mnth=0x3 YEAR=0X7DC kfdhdb.crestmp.lo:2015933440; 0x0ac:usec=0x0 msec=0x22d secs=0x2 mins=0x1e kfdhdb.mntstmp.hi:32969259; 0X0B0:HOUR=0XB days=0x11 mnth=0x4 YEAR=0X7DC kfdhdb.mntstmp.lo:2707277824; 0x0b4:usec=0x0 msec=0x372 secs=0x15 mins=0x28 kfdhdb.secsize:512; 0x0b8:0x0200 kfdhdb.blksize:4096; 0x0ba:0x1000 kfdhdb.ausize:1048576; 0x0bc:0x00100000 kfdhdb.mfact:113792; 0x0c0:0x0001bc80 kfdhdb.dsksize:2353; 0x0c4:0x00000931 Kfdhdb.pmcnt:2; 0x0c8:0x00000002 Kfdhdb.fstlocn:1; 0x0cc:0x00000001 Kfdhdb.altlocn:2; 0x0d0:0x00000002 Kfdhdb.f1b1locn:2; 0x0d4:0x00000002 Kfdhdb.redomirrors[0]: 0; 0x0d8:0x0000 KFDHDB.REDOMIRRORS[1]: 0; 0x0da:0x0000 KFDHDB.REDOMIRRORS[2]: 0; 0x0dc:0x0000 KFDHDB.REDOMIRRORS[3]: 0; 0x0de:0x0000 kfdhdb.dbcompat:168820736; 0x0e0:0x0a100000 kfdhdb.grpstmp.hi:32967790; 0x0e4:hour=0xe days=0x3 mnth=0x3 YEAR=0X7DC kfdhdb.grpstmp.lo:2015746048; 0x0e8:usec=0x0 msec=0x176 secs=0x2 mins=0x1e kfdhdb.vfstart:0; 0x0ec:0x00000000 kfdhdb.vfend:0; 0x0f0:0x00000000 kfdhdb.spfile:0; 0x0f4:0x00000000 kfdhdb.spfflg:0; 0x0f8:0x00000000 Kfdhdb.ub4spare[0]: 0; 0x0fc:0x00000000 KFDHDB.UB4SPARE[1]: 0; 0x100:0x00000000 KFDHDB.UB4SPARE[2]: 0; 0x104:0x00000000 KFDHDB.UB4SPARE[3]: 0; 0x108:0x00000000 KFDHDB.UB4SPARE[4]: 0; 0x10c:0x00000000 KFDHDB.UB4SPARE[5]: 0; 0x110:0x00000000 KFDHDB.UB4SPARE[6]: 0; 0x114:0x00000000 KFDHDB.UB4SPARE[7]: 0; 0x118:0x00000000 KFDHDB.UB4SPARE[8]: 0; 0x11c:0x00000000 KFDHDB.UB4SPARE[9]: 0; 0x120:0x00000000 KFDHDB.UB4SPARE[10]: 0; 0x124:0x00000000 KFDHDB.UB4SPARE[11]: 0; 0x128:0x00000000 KFDHDB.UB4SPARE[12]: 0; 0x12c:0x00000000 KFDHDB.UB4SPARE[13]: 0; 0x130:0x00000000 KFDHDB.UB4SPARE[14]: 0; 0x134:0x00000000 KFDHDB.UB4SPARE[15]: 0; 0x138:0x00000000 KFDHDB.UB4SPARE[16]: 0; 0x13c:0x00000000 KFDHDB.UB4SPARE[17]: 0; 0x140:0x00000000 KFDHDB.UB4SPARE[18]: 0; 0x144:0x00000000 KFDHDB.UB4SPARE[19]: 0; 0x148:0x00000000 KFDHDB.UB4SPARE[20]: 0; 0x14c:0x00000000 KFDHDB.UB4SPARE[21]: 0; 0x150:0x00000000 KFDHDB.UB4SPARE[22]: 0; 0x154:0x00000000 KFDHDB.UB4SPARE[23]: 0; 0x158:0x00000000 KFDHDB.UB4SPARE[24]: 0; 0x15c:0x00000000 KFDHDB.UB4SPARE[25]: 0; 0x160:0x00000000 KFDHDB.UB4SPARE[26]: 0; 0x164:0x00000000 KFDHDB.UB4SPARE[27]: 0; 0x168:0x00000000 KFDHDB.UB4SPARE[28]: 0; 0x16c:0x00000000 KFDHDB.UB4SPARE[29]: 0; 0x170:0x00000000 KFDHDB.UB4SPARE[30]: 0; 0x174:0x00000000 KFDHDB.UB4SPARE[31]: 0; 0x178:0x00000000 KFDHDB.UB4SPARE[32]: 0; 0x17c:0x00000000 KFDHDB.UB4SPARE[33]: 0; 0x180:0x00000000 KFDHDB.UB4SPARE[34]: 0; 0x184:0x00000000 KFDHDB.UB4SPARE[35]: 0; 0x188:0x00000000 KFDHDB.UB4SPARE[36]: 0; 0x18c:0x00000000 KFDHDB.UB4SPARE[37]: 0; 0x190:0x00000000 KFDHDB.UB4SPARE[38]: 0; 0x194:0x00000000 KFDHDB.UB4SPARE[39]: 0; 0x198:0x00000000 KFDHDB.UB4SPARE[40]: 0; 0x19c:0x00000000 KFDHDB.UB4SPARE[41]: 0; 0x1a0:0x00000000 KFDHDB.UB4SPARE[42]: 0; 0x1a4:0x00000000 KFDHDB.UB4SPARE[43]: 0; 0x1a8:0x00000000 KFDHDB.UB4SPARE[44]: 0; 0x1ac:0x00000000 KFDHDB.UB4SPARE[45]: 0; 0x1b0:0x00000000 KFDHDB.UB4SPARE[46]: 0; 0x1b4:0x00000000 KFDHDB.UB4SPARE[47]: 0; 0x1b8:0x00000000 KFDHDB.UB4SPARE[48]: 0; 0x1bc:0x00000000 KFDHDB.UB4SPARE[49]: 0; 0x1c0:0x00000000 KFDHDB.UB4SPARE[50]: 0; 0x1c4:0x00000000 KFDHDB.UB4SPARE[51]: 0; 0x1c8:0x00000000 KFDHDB.UB4SPARE[52]: 0; 0x1cc:0x00000000 KFDHDB.UB4SPARE[53]: 0; 0x1d0:0x00000000 kfdhdb.acdb.aba.seq:0; 0x1d4:0x00000000 kfdhdb.acdb.aba.blk:0; 0x1d8:0x00000000 kfdhdb.acdb.ents:0; 0x1dc:0x0000 kfdhdb.acdb.ub2spare:0; 0x1de:0x0000 [Grid@rac1 backup_asmheader]$ kfed read/dev/oracleasm/disks/vol4 text=vol4header.txt

Destroy VOL3 ASM Disk

The code is as follows

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[Root@rac1 backup_asmheader]# dd If=/dev/zero of=/dev/sdb1 bs=4096 count=1 1+0 Records in 1+0 Records out 4096 bytes (4.1 kB) copied, 0.00165264 seconds, 2.5 MB/s [Grid@rac1 backup_asmheader]$ kfed read/dev/oracleasm/disks/vol3 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 B4bfe200 00000000 00000000 00000000 00000000 [...]...... Repeat 255 Times Kfed-00322:invalid content encountered during block traversal: [kfbttraverseblock][invalid OSM block type][][0]

Start ASM

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[Grid@rac1 backup_asmheader]$ Sqlplus/as Sysoper Sql*plus:release 11.2.0.3.0 Production on Tue Apr 17 12:29:42 2012 Copyright (c) 1982, Oracle. All rights reserved. Connected to a idle instance. Sql> Startup ASM instance started Ora-15032:not all alterations performed Ora-15017:diskgroup "Xifenfei" cannot be mounted Ora-15063:asm discovered a insufficient number of disks for DiskGroup "Xifenfei"

Restore ASM DATE HEADER

code is as follows	copy code
--dd recovery [ ROOT@RAC1 backup_asmheader]# dd if=vol3header.dd of=/dev/sdb1 bs=4096 count=1 1+0 Records in 1+0 records out 4 096 bytes (4.1 kB) copied, 0.00197913 seconds, 2.1 mb/s   --kfed restore [Grid@rac1 backup_asmheader]$, kfed me Rge/dev/oracleasm/disks/vol3 text=vol3header.txt Mount DiskGroup sql> alter DiskGroup Mount; & nbsp DiskGroup altered.