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2V0-622D · Question #18

An administrator has multiple vCenter Server 6.5 systems but cannot enable Storage I/O Control (SIOC) on a datastore shared by ESXi hosts managed by the vCenter Server systems. Which action should…

The correct answer is B. Configure the datastore to be managed by a single vCenter Server system. SIOC cannot be enabled on a datastore shared across multiple vCenter Server instances because it requires centralized control under a single vCenter to coordinate I/O statistics.

Section 3 – Configure and Administer vSphere 6.5 Storage

Question

An administrator has multiple vCenter Server 6.5 systems but cannot enable Storage I/O Control (SIOC) on a datastore shared by ESXi hosts managed by the vCenter Server systems. Which action should the administrator take to resolve the issue?

Options

  • AUnmount the datastore and then enable SIOC on the vCenter Server system.
  • BConfigure the datastore to be managed by a single vCenter Server system.
  • CConfigure Storage DRS and then enable SIOC on the vCenter Server system.
  • DEnable Raw Device Mapping (RDM) on the ESXi hosts.

How the community answered

(61 responses)
  • A
    10% (6)
  • B
    70% (43)
  • C
    5% (3)
  • D
    15% (9)

Why each option

SIOC cannot be enabled on a datastore shared across multiple vCenter Server instances because it requires centralized control under a single vCenter to coordinate I/O statistics.

AUnmount the datastore and then enable SIOC on the vCenter Server system.

Unmounting the datastore does not address the root cause, which is multi-vCenter ownership - SIOC will still be blocked after remounting if multiple vCenter instances still manage hosts on that datastore.

BConfigure the datastore to be managed by a single vCenter Server system.Correct

SIOC relies on a single vCenter Server to collect and act on I/O latency statistics across all ESXi hosts accessing the datastore. When a datastore is shared by hosts managed by different vCenter Server instances, SIOC cannot function correctly because no single vCenter has visibility into all I/O activity. Configuring the datastore to be managed by one vCenter Server resolves this architectural limitation.

CConfigure Storage DRS and then enable SIOC on the vCenter Server system.

Storage DRS is a separate feature from SIOC and enabling it does not remove the multi-vCenter restriction that prevents SIOC activation.

DEnable Raw Device Mapping (RDM) on the ESXi hosts.

Raw Device Mapping is a disk presentation method unrelated to SIOC's management-plane requirement for a single vCenter Server.

Concept tested: Storage I/O Control single vCenter requirement

Source: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.resmgmt.doc/GUID-5AD2FDC5-7B91-42A4-87E3-CEABCB9D7D5D.html

Topics

#SIOC#Storage I/O Control#multi-vCenter datastore#SIOC limitation

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