2V0-621 · Question #72
Which three are requirements for configuring Storage I/O Control (SIOC)? (Choose three.)
The correct answer is A. The datastore must consist of only one extent. B. The datastore is managed by a single vCenter Server. C. Auto-tiered storage must be compatable with SIOC. Storage I/O Control enforces three key configuration requirements: a single-extent datastore, management by a single vCenter Server, and SIOC compatibility for any auto-tiered storage in use. All three must be satisfied before SIOC can be enabled.
Question
Which three are requirements for configuring Storage I/O Control (SIOC)? (Choose three.)
Options
- AThe datastore must consist of only one extent.
- BThe datastore is managed by a single vCenter Server.
- CAuto-tiered storage must be compatable with SIOC.
- DAuto-tiered storage must be SSD or SATA.
- EThe datastore must be VMFS.
How the community answered
(39 responses)- A92% (36)
- D3% (1)
- E5% (2)
Why each option
Storage I/O Control enforces three key configuration requirements: a single-extent datastore, management by a single vCenter Server, and SIOC compatibility for any auto-tiered storage in use. All three must be satisfied before SIOC can be enabled.
SIOC does not support multi-extent VMFS datastores because accurate latency measurement and I/O control depend on a unified single-extent volume; multiple extents introduce complexity that undermines SIOC's throttling accuracy.
All ESXi hosts accessing the datastore must be managed by the same vCenter Server instance, because SIOC relies on vCenter to centrally coordinate and enforce I/O quotas across every host simultaneously.
When auto-tiered storage is present it must explicitly support SIOC; incompatible auto-tiered arrays produce inaccurate latency readings that cause SIOC to make incorrect throttling decisions, so compatibility is a hard requirement.
There is no requirement that auto-tiered storage use specifically SSD or SATA media; the actual requirement is that the array must be SIOC-compatible, regardless of the underlying drive technology.
In vSphere 5.1 and later, including vSphere 6.x, SIOC supports both VMFS and NFS datastores, so limiting SIOC exclusively to VMFS is incorrect for the exam version context.
Concept tested: Storage I/O Control configuration requirements and constraints
Source: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.resmgmt.doc/GUID-37CC0E44-7BC7-479C-81DC-520B4A13C305.html
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