SK0-004 · Question #270
A server is having problems accessing its presented storage on a SAN. Which of the following could be causing the problem? (Select TWO).
The correct answer is A. NIC B. HBA. SAN storage access failures can be caused by a faulty HBA (Fibre Channel path) or NIC (iSCSI path), since both are valid transport mechanisms for SAN connectivity.
Question
A server is having problems accessing its presented storage on a SAN. Which of the following could be causing the problem? (Select TWO).
Options
- ANIC
- BHBA
- CTape backup drive
- DSCSI adapter
- ECPU
How the community answered
(53 responses)- A77% (41)
- C2% (1)
- D15% (8)
- E6% (3)
Why each option
SAN storage access failures can be caused by a faulty HBA (Fibre Channel path) or NIC (iSCSI path), since both are valid transport mechanisms for SAN connectivity.
A NIC is used for iSCSI-based SAN connectivity, where SCSI block storage commands are encapsulated in TCP/IP packets - a failed or misconfigured NIC breaks the iSCSI data path to the storage target.
An HBA is used for Fibre Channel SAN connectivity and is responsible for translating server I/O requests into FC protocol frames - a failed HBA or incorrect WWN zoning setting prevents the server from accessing SAN LUNs.
A tape backup drive is a local or library-attached backup device that does not participate in or affect a server's connectivity to SAN block storage.
A local SCSI adapter connects internal or direct-attached SCSI devices and is not a component in a network SAN fabric.
A CPU failure would manifest as broad system instability or complete unavailability rather than an isolated SAN storage access problem.
Concept tested: SAN storage access failure points NIC and HBA
Source: https://www.snia.org/education/storage_networking_primer
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