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I am trying to install Oracle ASM on Red Hat Linux (RHEL) 7.1, and for that I am trying to configure udev rules. I have noticed there is a new attribute in udev rules, SYMLINK+, which seems to be a replacement for the NAME attribute.

Working rules:

SUBSYSTEM=="block", KERNEL=="powerae",  SYMLINK+="ORAdisk1", OWNER="grid", GROUP="oinstall", MODE="0660"

Not working rules:

SUBSYSTEM=="block", KERNEL=="powerae",  NAME="ORAdisk1", OWNER="grid", GROUP="oinstall", MODE="0660"

I have searched in the Red Hat release note, but I could not find any details regarding udev rules. Are RHEL 6 udev rules compatible with RHEL 7?

G-Man Says 'Reinstate Monica'
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malatesh
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1 Answers1

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Now NAME can not even be changed for network interfaces.  It is well explained in the older man page below.

man udev

NAME

    The name to use for a network interface.  The name of a device node can not be changed by udev, only additional symlinks can be created.

Even with an older release 175:

NAME

    What a network interface should be named.

    Also, as a temporary workaround, this is what a device node should be named; usually the kernel provides the defined node name or creates and removes the node before udev even receives any event.  Changing the node name from the kernel's default creates inconsistencies and is not supported.  If the kernel and NAME specify different names, an error is logged.  udev is only expected to handle device node permissions and to create additional symlinks, not to change kernel-provided device node names.  Instead of renaming a device node, SYMLINK should be used.  However, symlink names must never conflict with device node names, as that would result in unpredictable behavior.

G-Man Says 'Reinstate Monica'
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user.dz
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    I submitted a suggested edit, but now I am not sure what you meant. Can you review that? And also can you elaborate your answer (e.g., addressing the question more directly and make more direct statements - e.g. it could begin with "No, because"). You can edit your answer (but *without* "Edit:", "Update:", or similar - the answer should appear as if it was written today). – Peter Mortensen May 03 '21 at 19:37