# zOS ## zOS Software **Status:**  **type:** `zos.software` **Description:** A software resource running on a z/OS system. **Other Attributes:** > :warning: This entity definition contains attributes without a role. > Stable Entities MUST NOT have attributes without a defined role. | Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability | |---|---|---|---|---|---| | [`zos.smf.id`](/docs/registry/attributes/zos.md) | string | The System Management Facility (SMF) Identifier uniquely identified a z/OS system within a SYSPLEX or mainframe environment and is used for system and performance analysis. | `SYS1` | `Required` |  | | [`zos.sysplex.name`](/docs/registry/attributes/zos.md) | string | The name of the SYSPLEX to which the z/OS system belongs too. | `SYSPLEX1` | `Required` |  | | [`mainframe.lpar.name`](/docs/registry/attributes/mainframe.md) | string | Name of the logical partition that hosts a systems with a mainframe operating system. | `LPAR01` | `Recommended` |  |