This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| World Wide Name | |
|---|---|
| Name | World Wide Name |
| Abbreviation | WWN |
| Type | Identifier |
| Introduced | 1990s |
| Domain | Storage Area Networks |
| Authority | Various standards bodies |
World Wide Name A World Wide Name is a persistent, unique identifier used in storage networking to name devices and entities across distributed systems. It functions similarly to identifiers like the International Standard Book Number or MAC address families and plays a central role in technologies such as Fibre Channel, SCSI, SAN switch, storage array, and host bus adapter deployments. WWNs are governed by standards and authorities including IEEE, IETF, and vendor ecosystems like EMC Corporation, NetApp, Hewlett-Packard, and IBM.
A World Wide Name provides a globally unique identifier for storage components, enabling addressability across infrastructures such as Storage Area Network fabrics, NAS appliances when integrated with block protocols, and clustered systems like VMware ESXi, Microsoft Hyper-V, and Red Hat Enterprise Linux clusters. It serves a role comparable to identifiers used by Intel Corporation for PCI Express devices and by IETF registries for protocol numbers, allowing interoperability among vendors including Cisco Systems, Brocade Communications Systems, Dell Technologies, Hitachi Vantara, and NetApp. Administrators map WWNs to configuration entities in management tools like vCenter Server, OpenStack Cinder, Kubernetes CSI drivers, and Ansible playbooks.
The concept of a unique worldwide identifier for storage evolved with early fabric technologies developed by companies such as IBM, EMC Corporation, and Hewlett-Packard during the rise of Fibre Channel in the 1990s. Standards work by organizations like Institute of Electrical and Electronics Engineers and registration processes associated with IEEE Registration Authority and IANA shaped assignment models, while vendors including Brocade Communications Systems and Cisco Systems implemented WWN usage in products alongside array vendors such as NetApp, Hitachi Data Systems, and EMC (later part of Dell EMC). Adoption expanded with virtualization platforms like VMware ESXi, orchestration projects like OpenStack, and large clusters operated by enterprises including Google and Amazon Web Services which influenced scale and operational practices.
WWNs are typically encoded as fixed-length hexadecimal values using formats influenced by identifier schemes from IEEE namespaces, similar in spirit to UUID and GUID encodings used by Microsoft and Linux Foundation projects. Two common presentation formats include 16-byte and 8-byte hexadecimal strings with vendor-specific Organizationally Unique Identifiers registered via IEEE Registration Authority, analogous to MAC address OUIs used by Cisco Systems and Intel Corporation. Device firmware in Broadcom and QLogic adapters exposes WWNs to operating systems like Windows Server, Red Hat Enterprise Linux, FreeBSD, and management stacks such as VMware vSphere and OpenStack Nova. Tools like sysfs, udev, and vendor utilities from Hewlett-Packard Enterprise and IBM parse and present WWNs for administrators.
WWNs enable zoning in fabrics managed by Brocade, Cisco MDS, and Brocade ICX switches, LUN masking in arrays from EMC, NetApp, and Hitachi Vantara, multipathing coordination in Linux multipathd, Microsoft MPIO, and VMware multipathing policies, and persistent storage identification in orchestration platforms like Kubernetes and OpenStack Cinder. Enterprises use WWNs for auditing in systems tied to Splunk, IBM QRadar, and ArcSight while cloud providers such as Microsoft Azure, Google Cloud Platform, and Amazon Web Services adopt analogous persistent identifiers for block storage. Backup solutions from Veeam, Commvault, and Veritas rely on WWN-based identification for consistent snapshots and replication across arrays like Dell EMC PowerMax and NetApp ONTAP.
Assignment of vendor OUIs and related identifier elements traces to the IEEE Registration Authority while operational allocation and policy are implemented by vendors including Broadcom, QLogic, Brocade Communications Systems, Cisco Systems, EMC Corporation, and NetApp. Administrators record WWNs in configuration management databases such as ServiceNow and BMC Helix, inventory tools like CMDB, and orchestration frameworks including Ansible, Puppet Labs, and Chef. Interactions with enterprise identity and access consoles from Microsoft and Red Hat integrate WWN mappings into broader asset management and compliance programs managed alongside standards like ISO/IEC family guidelines.
WWNs, like other persistent hardware identifiers such as MAC address and UUID values, can be used in access controls and authentication mechanisms in zoning and LUN masking, and thus appear in audit trails for platforms like Splunk and IBM QRadar. Risks include impersonation or spoofing via modified firmware in host bus adapters produced by Broadcom or QLogic, requiring vendor mitigations from Hewlett-Packard Enterprise and Dell Technologies and practices aligned with guidance from NIST and ISO/IEC standards. Privacy concerns arise when WWN exposure intersects with asset tracking systems used by enterprises like Google, Amazon, and Microsoft; mitigations include strict role-based access controls administered with Active Directory or LDAP and monitoring through SIEM solutions.
Interoperability of WWNs is supported by standards from IEEE, alignment with protocol registries maintained by IANA, and implementations in protocol suites such as Fibre Channel, SCSI, and management protocols leveraged by SNMP and SMI-S. Vendor interoperability testing programs among Cisco Systems, Brocade Communications Systems, NetApp, EMC Corporation, IBM, and Dell Technologies validate cross-vendor behavior, while open-source projects like Linux kernels, QEMU, and OpenStack provide implementations and tooling that rely on standardized WWN formats for consistent behavior across ecosystems.
Category:Storage identifiers