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Diskgroupをmountするときに、以下のようなエラが現れた、以下の文を読んでください：
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.
//
一般的に、そのエラはOSレベルの多パス配置にトラブルが起こった。あるノートに大量なストレージが現れたことに引き起こした。
例えば：
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
そしてkfedでDISK HEADERを検証する、以下のスクリプトを使ってください：
#! /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
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