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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.

Troubleshooting

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)
  • A
    77% (41)
  • C
    2% (1)
  • D
    15% (8)
  • E
    6% (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.

ANICCorrect

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.

BHBACorrect

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.

CTape backup drive

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.

DSCSI adapter

A local SCSI adapter connects internal or direct-attached SCSI devices and is not a component in a network SAN fabric.

ECPU

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

Topics

#SAN storage#HBA#NIC#storage connectivity troubleshooting

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