Pearson D-ISM-FN-01 New Attempt

Anincidentis anunplanned disruptionof a service or a reduction in its quality, often with anunknown root cause.

Incidents require immediate action to restore service.

Example: SAN switch port down, unexpected storage latency.

Support requestsare typically service requests, not incidents.

Impact actionsare more about changes, not incidents.

Events preventing correctionsmight be problems, not incidents.

Monitoringis the ongoing process of observing and tracking the performance and availability of IT infrastructure, including:

Storage devices

File systems

Ports and connectivity

It helps ensure service levels are met and detect potential issues.

Reporting: Summarizes data (often based on monitoring data).

Alerting: Notifies of specific events or thresholds (also uses monitoring data).

Infrastructure discovery: Detects and inventories devices.

Aread missoccurs when the data requested by the host isnotavailable in the cache. As a result, the storage system must fetch the data from the slower disk storage (back-end), leading to higher latency.

Cache hit:Data is already in cache → faster response.

Cache miss (read miss):Data not in cache → fetched from the disk.

NAS systemsare purpose-built to handle file sharing and provide:

Centralized file accessfor multiple clients.

Optimized file sharingthrough dedicated hardware and software.

Efficient managementwith file-level protocols (NFS, CIFS/SMB).

FC protocols(Option B) are for block storage, not NAS.

Object ID(Option C) relates to object storage, not NAS.

Speed (Option D): While NAS can offer good speed, its main advantage is shared file access.