Oracle database might have problems with stale NFSv3 locks upon restart

Jun 9, 20200 likes212 views

The document discusses stale NFS locks that can occur upon Oracle database restart with NFSv3. The issue is caused by lockd and rpc.statd using different name resolution methods to create and clear locks, resulting in non-matching host names. The solution is to change the order of host names in /etc/hosts so the same host name is used for lock creation and clearance.

Oracle database might have problems
with stale NFS locks upon restart!
Applies to: NFSv3
Cause: Creating a lock (NLM) and clearing (rpc.statd) a lock use two slightly different methods of
name resolution.
• NLM = uses uname -n to determine the host name
• rpc.statd = uses gethostbyname() to determine the host name
lockd = lockd is a kernel thread which runs on both clients and servers. It implements the Network
Lock Manager (NLM) protocol, which allows NFSv2 and NFSv3 clients to lock files on the server. It is
started automatically whenever the NFS server is run and whenever an NFS file system is mounted.
rpc.statd = This process implements the Network Status Monitor (NSM) RPC protocol, which notifies
NFS clients when an NFS server is restarted without being gracefully brought down. rpc.statd is
started automatically by the nfslock service, and does not require user configuration. This is not used
with NFSv4.
Why is lock required for NFSv3?
NFS version 3 protocol is stateless, an additional Network Lock Manager (NLM) protocol is required
to support locking of NFS-mounted files.
NFSv4 is a true stateful protocol : By 'true' stateful, I mean NFSv4 includes file-locking as part of the
protocol itself, rather than relying on Network Lock Manager (NLM) to provide that function as
NFSv3 does. Hence, the locks are dealt with more efficiently. These days, most (if not all) Linux
distributions default to NFSv4 and the most popular one Red Hat Enterprise Linux uses NFSv4 by
default, if the server supports it.

Solution:
These host names must match for the OS to properly clear stale locks.
For example: The host might be looking for locks owned by "dbserver", but the locks were registered
by the host as "dbserver.domain.com", If gethostbyname() does not return the same value as
"uname –a", then the lock release process will not succeed.
Steps to fix:
Change the order in which hosts appear in /etc/hosts.
For example, assume that the hosts file includes this entry:
192.x.x.x dbserver.domain.com dbserver
Change this to,
192.x.x.x dbserver dbserver.domain.com
ashwinwriter@gmail.com
June, 2020

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Book industry standards are evolving rapidly. In the first part of this session, we’ll share an overview of key developments from 2024 and the early months of 2025. Then, BookNet’s resident standards expert, Tom Richardson, and CEO, Lauren Stewart, have a forward-looking conversation about what’s next. Link to recording, presentation slides, and accompanying resource: https://bnctechforum.ca/sessions/standardsgoals-for-2025-standards-certification-roundup/ Presented by BookNet Canada on May 6, 2025 with support from the Department of Canadian Heritage.

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The MCP (Model Context Protocol) is a framework designed to manage context and interaction within complex systems. This SlideShare presentation will provide a detailed overview of the MCP Model, its applications, and how it plays a crucial role in improving communication and decision-making in distributed systems. We will explore the key concepts behind the protocol, including the importance of context, data management, and how this model enhances system adaptability and responsiveness. Ideal for software developers, system architects, and IT professionals, this presentation will offer valuable insights into how the MCP Model can streamline workflows, improve efficiency, and create more intuitive systems for a wide range of use cases.

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Noah Loul Shares 5 Steps to Implement AI Agents for Maximum Business Efficien...Noah Loul

Artificial intelligence is changing how businesses operate. Companies are using AI agents to automate tasks, reduce time spent on repetitive work, and focus more on high-value activities. Noah Loul, an AI strategist and entrepreneur, has helped dozens of companies streamline their operations using smart automation. He believes AI agents aren't just tools—they're workers that take on repeatable tasks so your human team can focus on what matters. If you want to reduce time waste and increase output, AI agents are the next move.

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