在安裝好RAC (ASM disk group initialized) , Aix 主機reboot 之後, Aix 會嘗試把Disk header 恢復成之前的狀態, 進而造成Header corruption
所以ASM instance 就辨識不到這些LUN Disks
底下連結所提的方法應可以修正之, 但建議還是須向Oracle 開SR以確認正確的修正步驟
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Corrective Action for ASM Diskgroup with Disks Having PVIDs on AIX (Doc ID 750016.1)
2] This needs downtime:
2.1] Take 'dd' backup of the disk headers
# dd if=/dev/hdisk5 of=/tmp/d5.txt bs=1024 count=1024
2.2] Shutdown ASM instance ( on ALL the nodes in RAC setup ).
2.3] Clear the PVID
# chdev -l hdisk5 -a pv=clear
Run this on ALL the nodes in case of RAC.
2.4] Check the disk does not have the PVID from ALL the nodes
# lspv
2.5] Start the ASM Instance(s) and mount the diskgroup on ALL the nodes
WARNING:
Point-2 commands overrides the content of the disk header and so could be destructive if not correctly used. If you have any doubt, raise an SR with Oracle Support before any action.
2.1] Take 'dd' backup of the disk headers
# dd if=/dev/hdisk5 of=/tmp/d5.txt bs=1024 count=1024
2.2] Shutdown ASM instance ( on ALL the nodes in RAC setup ).
2.3] Clear the PVID
# chdev -l hdisk5 -a pv=clear
Run this on ALL the nodes in case of RAC.
2.4] Check the disk does not have the PVID from ALL the nodes
# lspv
2.5] Start the ASM Instance(s) and mount the diskgroup on ALL the nodes
WARNING:
Point-2 commands overrides the content of the disk header and so could be destructive if not correctly used. If you have any doubt, raise an SR with Oracle Support before any action.
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