The error message "Unable to determine robot type" indicates that the Cohesity cluster cannot automatically identify the model of the connected tape library's robotic controller. This typically occurs when the hardware is new or not listed in the cluster's current configuration files.

The two most direct solutions are:

1. Update the device mapping file (devicemapping.conf), which contains the definitions Cohesity uses to identify hardware. An updated file can be obtained from Cohesity Support to add support for the new library (A).

2. Utilize the manual selection feature in the Cohesity UI. If auto-discovery fails, the administrator can manually choose the correct tape library model from a dropdown list of supported devices, overriding the failed automatic identification (E).

B. The ready state of an individual tape drive is a separate issue and would not cause a failure in identifying the library's robotic controller type.

C. A rescan only repeats the discovery process. If the underlying device mapping file is missing the required information, the rescan will fail with the same error.

D. NetBackup is a separate, third-party backup application. Its hardware compatibility list is entirely irrelevant to Cohesity's native tape library support and configuration.

1. Cohesity DataPlatform Administration Guide (v6.6)

Tape Libraries > Add a Tape Library to Cohesity Cluster. The guide states: "Cohesity cluster automatically discovers the vendor

product

and model of the tape library and its drives. If your tape library is not discovered

you can select it manually." This procedure directly supports option E as a valid solution.

2. Cohesity Knowledge Base Article KB-4045

Troubleshooting Tape Library Issues. This article and related support documentation explain that for unrecognized tape hardware

the devicemapping.conf file may need to be updated. The standard procedure is to contact Cohesity Support to verify compatibility and

if necessary

obtain a new mapping file. This supports option A.

3. Cohesity Tape and Cloud Archive Compatibility Guide

This official document lists all supported tape libraries. It makes no reference to third-party software compatibility lists like NetBackup's

demonstrating that option D is incorrect as Cohesity maintains its own HCL (Hardware Compatibility List).