Free Practice Questions for Cohesity COH-285 Exam

The correct resources are the operating system logs and the robtest command. The failure is not a client file-read problem; it occurs when bptm requests tape media and the robot cannot complete the operation. Cohesity NetBackup documentation describes the tape workflow: bptm reserves drives and issues mount requests through the Media Manager and robotic daemons, which perform the physical media mount. When the job detail reports “Robot operation failed” and “All drives down,” the fault domain is tape device access, robotic control, drive visibility, zoning, library state, or OS-level SCSI communication. Official troubleshooting guidance states that NetBackup uses OS-level commands and drivers for tape operations, and recommends starting at the OS and hardware layer and checking OS system/event logs. The robtest utility is also directly relevant because it issues basic SCSI commands to a robotic device attached to a NetBackup media server and can test drive status, slot status, move operations, and robot readiness. Options B, C, and D are less relevant: bpbkar is a backup client read process, nbdevconfig is primarily disk-storage configuration, and bpmedia manages media records rather than robotic motion or drive connectivity.

The correct causes are an incorrect client host-name resolution entry on the primary server and stopped NetBackup client processes. The bptestbpcd utility is specifically used to establish a connection from a NetBackup server to the bpcd daemon on a NetBackup host or client, and successful output reports the socket connections that were established. A status 25: cannot connect on socket means the primary server could not complete that socket connection. Official NetBackup troubleshooting guidance states that status 25 commonly results when the client does not acknowledge the TCP connection, the server cannot resolve the client, the client is not listening on bpcd/vnetd, or name resolution fails. Therefore, an incorrect hosts-file entry for clientA on the primary server can send the connection attempt to the wrong address or prevent proper resolution. Likewise, if the NetBackup processes on the client are stopped, the client will not be listening on the required bpcd/vnetd ports. The troubleshooting procedure specifically instructs administrators to verify that the client has bpcd and vnetd ports in listening mode. Options B and E are unrelated to this client-side connection test, while C aligns more closely with authorization failures such as status 59. References/topics: bptestbpcd, status code 25, client name resolution, and bpcd/vnetd client connectivity troubleshooting.

The replication job starts when the force interval for small replication jobs is reached. NetBackup SLP settings control how Storage Lifecycle Policy jobs are maintained and executed for the selected primary server. Cohesity documentation identifies these as SLP settings used to customize how SLP jobs run. For AIR replication batching, the controlling parameter here is SLP.MIN_SIZE_PER_REPLICATION_JOB. Official NetBackup documentation defines it as the smallest batch size that can run as a single replication job and states that the job does not run until enough images accumulate to reach that size, or until the force interval for small replication jobs is reached. (veritas.com)

In this scenario, three backups of 5GB each create only 15GB of eligible replication data. That is below the configured 20GB threshold, so NetBackup does not start the replication job based on size. Because the backup window has closed and no additional backup images will arrive, the batch cannot reach 20GB. NetBackup therefore submits the small replication batch when the oldest image reaches the configured 60-minute force interval. The force interval is specifically designed to prevent NetBackup from waiting too long before submitting a small replication job. (veritas.com)