Which rule in a virtual machine (VM) storage policy is configured to ensure data redundancy in a VMware vSAN environment?

Question

Options

• AFailures to Tolerate
• BDisk Stripes Per Object
• CStripe Width
• DFlash Read Cache Reservation

• A
  89% (17)
• B
  5% (1)
• D
  5% (1)

Explanation

Failures to Tolerate (FTT) is the vSAN storage policy rule that directly controls data redundancy by defining how many simultaneous host, disk, or network failures a VM's storage object can survive - setting FTT=1 means vSAN maintains at least 2 copies of the data across different hosts. Disk Stripes Per Object (B) controls performance by spreading data across multiple capacity devices, not redundancy. Stripe Width (C) is essentially the same concept as Disk Stripes Per Object and governs I/O performance distribution, not fault tolerance. Flash Read Cache Reservation (D) allocates a percentage of an object's logical size as read cache on flash devices, which is a performance optimization with no bearing on redundancy.

Memory tip: Think of FTT as "how many failures can I tolerate before losing data?" - the word tolerate in the rule name maps directly to fault tolerance, making it the obvious redundancy rule.

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