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This article will explain in detail how to reinstall 12C RAC can not recognize the disk group. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Scene:

There is a set of 12.2 clusters that need to be reinstalled, and then during the reinstallation process, it is found that no matter how much disk space dd has, the OCR disk group is not recognized, and the status always shows as member.

Reason:

(reference) http://www.oracle.com/technetwork/cn/articles/database/asmfd-2398572-zhs.html

In a nutshell, this is a new feature that replaces the ASMLIB and udev settings, and also adds the I Filter O Filter function, which is also reflected in the naming of this feature. ASMFD is currently only available in the Linux operating system, and you must use the latest version of Oracle ASM 12.1.0.2. Previously, because the Linux operating system found block devices in an irregular order, it was impossible to guarantee the original / dev/sda or sda after the system was rebooted, so the original device name could not be used as the Path of ASM Disk directly, so ASMLIB appeared and gave the device a fixed name in the way of Label, while ASM directly used this fixed name to create an ASM disk. Later, ASMLIB had to be downloaded with a ULN account, so everyone switched to udev, so I wrote several articles on how to set up udev rule in Linux. For example:

How to use udev for Oracle ASM in Oracle Linux 6

Oracle Datafiles & Block Device & Parted & Udev

Now Oracle has introduced ASMFD, which can replace the hassle of ASMLIB and manually setting up udev rules files, and most importantly, the Imax O Filter function.

Solution:

Rm-rf / dev/oracleafd/*

Reboot

Dd if=/dev/zero of=/dev/sdb1 bs=200m count=1

Start_udev

This is the end of the article on "how to reinstall 12C RAC can not recognize the disk group". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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