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如果在mount diskgroup时遇到如下错误，则你有必要读一下这篇文章：
SQL> alter diskgroup DATA mount; alter diskgroup DATA mount * ERROR at line 1: ORA-15032: not all alterations performed ORA-15040: diskgroup is incomplete ORA-15042: ASM disk "17" is missing from group number "1" ORA-15042: ASM disk "16" is missing from group number "1" ORA-15042: ASM disk "15" is missing from group number "1" ORA-15042: ASM disk "14" is missing from group number "1" ORA-15042: ASM disk "13" is missing from group number "1" ORA-15038: disk 'ORCL:DATA25' mismatch on 'Time Stamp' with target disk group [1861040353] [1861808156] ORA-15038: disk 'ORCL:DATA24' mismatch on 'Time Stamp' with target disk group [1861040353] [1861808156] ORA-15038: disk 'ORCL:DATA23' mismatch on 'Time Stamp' with target disk group [1861040353] [1861808156] ORA-15038: disk 'ORCL:DATA22' mismatch on 'Time Stamp' with target disk group [1861040353] [1861808156] ORA-15038: disk 'ORCL:DATA21' mismatch on 'Time Stamp' with target disk group [1861040353] [1861808156] [oracle@mlab2 ~]$ oerr ora 15042 15042, 00000, "ASM disk \"%s\" is missing from group number \"%s\" " // *Cause: The specified disk, which is a necessary part of a diskgroup, // could not be found on the system. // *Action: Check the hardware configuration. // [oracle@mlab2 ~]$ oerr ora 15038 15038, 00000, "disk '%s' mismatch on '%s' with target disk group [%s] [%s]" // *Cause: An attempt was made to mount into a disk group a disk whose // recorded allocation unit size, metadata block size, physical // sector size, or creation time stamp was inconsistent with the other // disk group members. // *Action: Check if the system configuration has changed. Verify disk // discovery string. //
该错误一般是由于OS级别的多路径配置存在问题，导致某个节点上出现大量重复的存储设备而引起的。
对于该类问题，首先从alert.log确认最近一次成功mount时那些磁盘对mount而言是必要的，例如：
NOTE: cache opening disk 11 of grp 1: DATA2 label:DATA2 <<<<<<<<<<<<<<<<<< 5 NOTE: cache opening disk 12 of grp 1: DATA20 label:DATA20 > NOTE: cache opening disk 13 of grp 1: DATA3 label:DATA3 <<<<<<<<<<<<<<<<<<<<<< 6 NOTE: cache opening disk 14 of grp 1: DATA4 label:DATA4 NOTE: cache opening disk 15 of grp 1: DATA5 label:DATA5 NOTE: cache opening disk 16 of grp 1: DATA6 label:DATA6 NOTE: cache opening disk 17 of grp 1: DATA7 label:DATA7 NOTE: cache opening disk 18 of grp 1: DATA8 label:DATA8 NOTE: cache opening disk 19 of grp 1: DATA9 label:DATA9
接下来可以通过kfed来验证DISK HEADER，使用如下脚本：
#! /bin/sh rm /tmp/kfed_DH.out /tmp/kfed_FS.out /tmp/kfed_BK.out /tmp/kfed_FD.out /tmp/kfed_DD.out /tmp/kfed_PST.out for i in `ls /dev/asm-disk*` do echo $i >> /tmp/kfed_DH.out kfed read $i >> /tmp/kfed_DH.out echo $i >> /tmp/kfed_FS.out kfed read $i blkn=1 >> /tmp/kfed_FS.out echo $i >> /tmp/kfed_BK.out kfed read $i aun=1 blkn=254 >> /tmp/kfed_BK.out echo $i >> /tmp/kfed_FD.out kfed read $i aun=2 blkn=1 >> /tmp/kfed_FD.out echo $i >> /tmp/kfed_DD.out kfed read $i aun=2 blkn=2 >> /tmp/kfed_DD.out echo $i >> /tmp/kfed_PST.out kfed read $i aun=1 blkn=2 >> /tmp/kfed_PST.out done
