Describe and Manage FAST Cache UNITY-OPERATE Practice Questions (Page 2)

Questions 6–10

1. 6expert · hard

   A Unity array hosts a critical OLTP database. The administrator enables FAST Cache. After a week, the administrator observes that the FAST Cache hit rate is high, but the database's transaction latency has increased. What is the most likely cause?

   • AFAST Cache is causing write amplification, increasing latency.
   • BThe database is experiencing lock contention, unrelated to storage.
   • CFAST Cache is too small, causing frequent evictions.
   • DFAST Cache is using RAID 5, causing write overhead.
   Reveal Solution Discussion Select an answer first
2. 7application · medium

   A Unity array has FAST Cache enabled, but the administrator notices that the FAST Cache hit rate is very low. What is the most likely cause?

   • AThe workload has a large working set that exceeds the FAST Cache size.
   • BThe FAST Cache is using NL-SAS drives.
   • CThe FAST Cache is too large for the workload.
   • DThe FAST Cache is disabled.
   Reveal Solution Discussion Select an answer first
4. 8foundation · easy

   How does FAST Cache improve performance in a Dell Unity system?

   • ABy using RAM to store frequently accessed data blocks
   • BBy storing frequently accessed data on flash drives that act as an extension of the system cache
   • CBy compressing data in memory to reduce I/O
   • DBy moving entire LUNs to a faster disk tier automatically
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   A Unity array hosts a backup application that writes large sequential data streams. The administrator enables FAST Cache. What is the expected performance impact?

   • AMinimal improvement because sequential writes are not typically cache-friendly.
   • BPerformance will degrade because FAST Cache adds overhead.
   • CNo change because FAST Cache only affects reads.
   • DSignificant improvement because FAST Cache accelerates all writes.
   Reveal Solution Discussion Select an answer first
6. 10application · medium

   A Unity array hosts a file server with a mix of read and write workloads. After enabling FAST Cache, the administrator notices that write performance has improved significantly. What is the most likely reason for this improvement?

   • AFAST Cache reduces the number of write operations by compressing data.
   • BFAST Cache moves frequently written data to a faster tier.
   • CFAST Cache absorbs write bursts by caching writes in flash before destaging to disks.
   • DFAST Cache increases the DRAM write cache size.
   Reveal Solution Discussion Select an answer first