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2V0-620 · Question #67

Which two statements are true regarding VMware vSphere Flash Read Cache (vFRC)? (Choose two.)

The correct answer is A. Cache fills and cache evictions happen in the granularity of a cache block size. B. vFRC caches data from both read and write I/Os, but write I/Os are always serviced by the. vSphere Flash Read Cache operates at the configured cache block granularity for fills and evictions, and always commits write I/Os directly to the backend datastore for durability.

Section 2 – Administer vSphere Resources

Question

Which two statements are true regarding VMware vSphere Flash Read Cache (vFRC)? (Choose two.)

Options

  • ACache fills and cache evictions happen in the granularity of a cache block size.
  • BvFRC caches data from both read and write I/Os, but write I/Os are always serviced by the
  • CvFRC caches data from both read and write I/Os, but write I/Os are always serviced by the
  • DCache fills and cache evictions happen in the granularity of the disk block size.

How the community answered

(38 responses)
  • A
    79% (30)
  • C
    5% (2)
  • D
    16% (6)

Why each option

vSphere Flash Read Cache operates at the configured cache block granularity for fills and evictions, and always commits write I/Os directly to the backend datastore for durability.

ACache fills and cache evictions happen in the granularity of a cache block size.Correct

vFRC manages all cache fill and eviction operations at the unit of the administrator-configured cache block size, which controls the granularity of data tracked in the flash tier and can differ from the underlying storage block size.

BvFRC caches data from both read and write I/Os, but write I/Os are always serviced by theCorrect

vFRC uses a write-through caching model, meaning write I/Os are always sent to and acknowledged by the backend datastore rather than being absorbed by the flash cache, ensuring data integrity and persistence.

CvFRC caches data from both read and write I/Os, but write I/Os are always serviced by the
DCache fills and cache evictions happen in the granularity of the disk block size.

Cache fills and evictions in vFRC do not occur at the disk block size granularity; they use the separately configured cache block size, making this statement technically incorrect.

Concept tested: vSphere Flash Read Cache block granularity and write-through behavior

Source: https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.storage.doc/GUID-C9A46793-9A0F-49BD-B9A7-56FAB1EC2948.html

Topics

#Flash Read Cache#vFRC#cache block size#storage I/O

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