Describe Dynamic Pool Expansion, Considerations for Mixing Drive Sizes and the Rebuild Process UNITY-DEPLOY Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   An administrator adds a set of new drives to an existing Unity XT dynamic pool. After the expansion, what happens to the existing data in the pool?

   • AThe existing data is moved to the new drives to free up the original drives for better performance.
   • BThe system automatically rebalances data across all drives, including the new ones, to optimize performance and capacity utilization.
   • CThe existing data is temporarily unavailable until the rebalancing process completes.
   • DThe existing data remains on the original drives, and only new writes go to the added drives.
   Reveal Solution Discussion Select an answer first
2. 17application · easy

   A Unity XT dynamic pool has 8 x 1.92 TB SAS SSDs. The administrator adds 4 x 1.92 TB SAS SSDs to the pool. What is the total usable capacity of the pool after the expansion?

   • A23.04 TB, because all drives are the same size and the pool uses the full capacity of each drive.
   • BThe expansion will fail because the pool already has 8 drives.
   • C15.36 TB, because the pool only uses the capacity of the original drives.
   • D19.2 TB, because the pool averages the capacity of the original and new drives.
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A Unity XT dynamic pool has a mix of 1.92 TB and 3.84 TB SAS SSDs. A 3.84 TB drive fails. What is the impact on the rebuild process?

   • AThe rebuild uses distributed spare capacity, and the pool's usable capacity is reduced by the amount of spare used.
   • BThe rebuild will fail because the pool has mixed drive sizes.
   • CThe rebuild is faster because the failed drive is larger, allowing more parallel I/O.
   • DThe rebuild will use the spare capacity from the 1.92 TB drives only, leaving the 3.84 TB drives untouched.
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A Unity XT dynamic pool has 12 drives and one drive fails. The pool has no dedicated hot spare. What happens to the data on the failed drive and how is it rebuilt?

   • AThe pool stops accepting I/O until a replacement drive is installed and the rebuild completes.
   • BThe data is rebuilt onto the remaining drives using the pool's distributed spare capacity, and the pool continues to operate in a degraded state.
   • CThe pool automatically replaces the failed drive with a new one from inventory and rebuilds the data onto it.
   • DThe data is lost because there is no dedicated hot spare to rebuild onto.
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   An administrator is planning to expand a Unity XT dynamic pool by adding drives. The pool is currently 80% full and experiencing high I/O load. What is the most important consideration regarding the expansion?

   • AThe pool must be taken offline to add the new drives.
   • BThe new drives must be the same size as the existing drives to avoid capacity waste.
   • CThe rebalancing process will add additional I/O load, which may temporarily impact performance.
   • DThe expansion will fail because the pool is too full.
   Reveal Solution Discussion Select an answer first