2V0-621 · Question #145
Which two reasons would prevent Storage Distributed Resource Scheduler (SDRS) from operating on a datastore? (Choose two.)
The correct answer is A. The datastore has Storage I/O Control disabled. B. The datastore is connected to an unsupported host. SDRS requires Storage I/O Control to be enabled and all connected hosts to be supported; either condition being unmet halts SDRS operations.
Question
Which two reasons would prevent Storage Distributed Resource Scheduler (SDRS) from operating on a datastore? (Choose two.)
Options
- AThe datastore has Storage I/O Control disabled.
- BThe datastore is connected to an unsupported host.
- CThe datastore is hosted on an NFS server.
- DThe datastore is hosted on an iSCSI server.
How the community answered
(23 responses)- A65% (15)
- C22% (5)
- D13% (3)
Why each option
SDRS requires Storage I/O Control to be enabled and all connected hosts to be supported; either condition being unmet halts SDRS operations.
SDRS relies on Storage I/O Control (SIOC) to collect I/O latency and throughput metrics from the datastore; without SIOC enabled, SDRS has no data to make load-balancing or initial placement recommendations.
SDRS requires all hosts connected to a datastore cluster to be compatible ESXi hosts; an unsupported host prevents SDRS from uniformly managing and migrating storage across the cluster.
NFS datastores are a supported storage type for SDRS capacity balancing, so hosting on an NFS server alone does not prevent SDRS from operating.
iSCSI datastores are fully supported by SDRS for both capacity and I/O load balancing and do not prevent its operation.
Concept tested: Storage DRS prerequisites - SIOC and host compatibility
Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.resmgmt.doc/GUID-C8902B83-530E-4093-B44B-E3C7960F8D24.html
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