2V0-622 · 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. SIOC requires the datastore to be a single extent, managed by one vCenter Server, and any auto-tiered storage in use must explicitly support SIOC to avoid conflicts with the array's internal tiering logic.
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
(42 responses)- A93% (39)
- D2% (1)
- E5% (2)
Why each option
SIOC requires the datastore to be a single extent, managed by one vCenter Server, and any auto-tiered storage in use must explicitly support SIOC to avoid conflicts with the array's internal tiering logic.
SIOC cannot function on a VMFS datastore that spans multiple extents because it cannot accurately measure and enforce latency thresholds across discontiguous storage segments, so the datastore must be a single-extent volume.
SIOC coordinates I/O throttling across all ESXi hosts through vCenter Server; if multiple vCenter Servers manage the same datastore, there is no single control plane to arbitrate I/O shares, making this a firm requirement.
When auto-tiered arrays perform their own internal I/O tiering, artificially high or low latency readings can confuse SIOC; the array must be certified as SIOC-compatible so that its behavior does not interfere with SIOC's congestion detection.
The SIOC requirement for auto-tiered storage is compatibility with SIOC, not a specific physical media type such as SSD or SATA; the media type alone does not determine SIOC supportability.
SIOC supports both VMFS and NFS datastores, so restricting it exclusively to VMFS is not a requirement; NFS support was added in vSphere 5.0.
Concept tested: Storage IO Control datastore and infrastructure requirements
Source: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.resmgmt.doc/GUID-BB5B1A37-494A-4E87-8F56-BEF5FCC01B09.html
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