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Table of contents
Description
General Information
When OpenVMS is used with Fibre Channel disks, it requires a user-defined identifier (UDID) for each Fibre Channel LUN to detect and name the storage device.
A UDID is a non-negative integer that is defined on the storage sub-system and used when an OpenVMS device name is created.
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This article describes the use of the user-defined identifier (UDID) in an OpenVMS environment. Charon products do not specify requirements regarding this value. The requirements are set by the OpenVMS operating system. |
Valid UDID values
Valid UDID values are decimal numbers from 0 to 32766.
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If the Fibre Channel disk device is served via MSCP, the device identifier is limited to 9999. |
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The UDID may be configured to match the device LUN, but this is not a requirement. |
Disk device names on OpenVMS
A Fibre Channel storage disk device name is created by the operating system from the constant value $1$DGA and the user-defined device identifier, nnnnn. For example: "$1$DGA512".
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OpenVMS treats LUN 0 differently than other LUNs: for allocation class 1 (disk devices), LUN 0 is treated as the Command Console LUN (CCL). It is not displayed as a storage device but as $1$GGAnnnnn device. |
Device UDID discovery
OpenVMS detects the UDID value of a device in one of two ways:
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