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Exam DSDPS-200 All Questions

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Exam DSDPS-200 topic 1 question 32 discussion

Actual exam question from Dell's DSDPS-200
Question #: 32
Topic #: 1
[All DSDPS-200 Questions]

An installer sets up multiple volumes on a PS Series group and uses CHAP for access control. A host can NOT access the volume named TESTVOL. The host can see the volume target name in its iSCSI initiator and another server on the same subnet can access it.
What is the probable cause of this issue?

  • A. The host has the incorrect Group IP address in its initiator.
  • B. The host has the incorrect CHAP account configured.
  • C. The volume has multi-host access disallowed.
  • D. The volume has multi-host access allowed.
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Suggested Answer: C 🗳️
In a shared storage environment, you must control computer access to iSCSI targets (volumes and snapshots), because multiple computers writing to a target in an uncoordinated manner might result in volume corruption.
When an initiator tries to log in to a target, the group uses access control records to determine if access should be authorized. However, access control records do not prevent multiple initiators, either on the same computer or different computers, from accessing the same target.
Therefore, by default, the group disables multi-host (shared) access to a target. Therefore, only one iSCSI qualified name (IQN) can connect to a target at one time.
Note: You can use Challenge Handshake Authentication Protocol (CHAP) for iSCSI authentication to manage access controls more efficiently. Using a challenge- response mechanism, CHAP restricts target access through user names and passwords instead of unique IP addresses or iSCSI initiator names. You can use
CHAP to authenticate iSCSI initiators by specifying a CHAP user name in an access control record. In response, a computer must supply the user name and its password (or "secret") in the initiator configuration interface when logging in to the target.
References:
http://psonlinehelp.equallogic.com/V5.0/Content/V5TOC/Multi_Host_access_to_targets.htm
by pavilu at April 5, 2025, 3:02 a.m.

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