Oracle Linux : Partitions are not recognized correctly on RAC cluster nodes (Doc ID 2803212.1)

Last updated on SEPTEMBER 13, 2021

Applies to:

Symptoms

Created some partitions for the added disks, but some device files for the partition are not created after the OS reboot.

The following is an example of a command used to create a partition, where approximately 190 devices are actually connected.

# parted --script /dev/mapper/<ID 1> 'mklabel gpt'
# parted --script /dev/mapper/<ID 2> 'mkpart primary 0% 100%'

# ls -l /dev/mapper/*
(snip)
lrwxrwxrwx 1 root root 8 Oct 28 07:01 /dev/mapper/<ID 3> -> ../dm-46
lrwxrwxrwx 1 root root 8 Oct 28 07:01 /dev/mapper/<ID 4> -> ../dm-33
lrwxrwxrwx 1 root root 8 Oct 28 07:01 /dev/mapper/<ID 5> -> ../dm-51
lrwxrwxrwx 1 root root 8 Oct 28 07:01 /dev/mapper/<ID 6> -> ../dm-63
(snip)

However, the partition is no longer visible until you run the parted command after the system booted.

# ls -l /dev/mapper/*
(snip)
lrwxrwxrwx 1 root root 8 Oct 28 07:07 /dev/mapper/<ID 3> -> ../dm-46
lrwxrwxrwx 1 root root 9 Oct 28 07:07 /dev/mapper/<ID 7> -> ../dm-172
lrwxrwxrwx 1 root root 8 Oct 28 07:06 /dev/mapper/<ID 4> -> ../dm-33
lrwxrwxrwx 1 root root 9 Oct 28 07:06 /dev/mapper/<ID 8> -> ../dm-157
lrwxrwxrwx 1 root root 8 Oct 28 07:06 /dev/mapper/<ID 5> -> ../dm-51
lrwxrwxrwx 1 root root 9 Oct 28 07:06 /dev/mapper/<ID 9> -> ../dm-158
lrwxrwxrwx 1 root root 8 Oct 28 07:06 /dev/mapper/<ID 6> -> ../dm-63
lrwxrwxrwx 1 root root 9 Oct 28 07:06 /dev/mapper/<ID 10> -> ../dm-151
(snip)

Changes

In this environment, the startup image is forced to include multipath by executing following commands after the system built.

# dracut --force --add multipath --include /etc/multipath

Cause

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