Troubleshooting Server Access to SAN Storage

AB.

The most likely causes of a server being unable to access its presented storage on a Storage Area Network (SAN) are related to the server's hardware components that allow it to communicate with the SAN. These hardware components include the Network Interface Card (NIC) and Host Bus Adapter (HBA).

Explanation:

• NIC: The NIC is responsible for communicating with the SAN over the network, so any issues with the NIC's hardware or network configuration could cause connectivity problems.
• HBA: The HBA is the component that connects the server to the SAN's storage devices, and any issues with the HBA's hardware or configuration could cause the server to be unable to access the SAN's storage.

The other options are less likely to cause problems with SAN connectivity:

• Tape backup drive: A tape backup drive is not directly related to SAN connectivity, so it is unlikely to be the cause of this problem.
• SCSI adapter: A SCSI adapter could be related to storage connectivity, but it is not specific to SANs and is less commonly used in SAN environments.
• CPU: The CPU is responsible for processing data and instructions but does not directly interact with the SAN or its storage devices, so it is unlikely to be the cause of this problem.

In summary, A and B are the most likely causes of the server being unable to access its presented storage on a SAN.