D-UN-OE-23 · Question #25
What are two recommendations for configuring synchronous replication on a Dell Unity XT system? (Select 2)
The correct answer is C. Latency below 10 milliseconds D. A maximum of 100 km (60 mi) distance. For synchronous replication on Dell Unity XT, low latency (under 10ms round-trip) is required because every write must be committed on the remote site before the primary acknowledges the I/O - higher latency would cause severe application performance degradation. The 100 km…
Question
What are two recommendations for configuring synchronous replication on a Dell Unity XT system? (Select 2)
Options
- ASession RPO must be set to zero
- BDataset to be less than 100 TB
- CLatency below 10 milliseconds
- DA maximum of 100 km (60 mi) distance
How the community answered
(15 responses)- A7% (1)
- B7% (1)
- C87% (13)
Explanation
For synchronous replication on Dell Unity XT, low latency (under 10ms round-trip) is required because every write must be committed on the remote site before the primary acknowledges the I/O - higher latency would cause severe application performance degradation. The 100 km distance limit directly ties to this, as signal propagation over fiber at that distance keeps round-trip latency within acceptable bounds given the speed of light constraints.
Option A is wrong because RPO=0 is the outcome of synchronous replication, not a configuration parameter you set - it's what sync replication inherently provides by design. Option B is wrong because a 100 TB dataset size threshold is not a Dell Unity XT synchronous replication requirement; data size affects bandwidth planning but is not a stated configuration prerequisite.
Memory tip: Think "10 and 100" - 10ms latency ceiling and 100km distance ceiling. Both numbers represent physical-layer constraints that ensure the synchronous write-confirm cycle doesn't stall your applications.
Topics
Community Discussion
No community discussion yet for this question.