An administrator is configuring Storage I/O Control. After enabling, the administrator notices high device latency and poor storage performance. Which two actions would likely reduce latency and…

The congestion threshold defines when SIOC begins to enforce I/O shares. Lowering the threshold to 15ms (from a default of 30ms) causes SIOC to activate earlier when latency rises, proactively distributing I/O resources and preventing further performance degradation.

Setting the congestion threshold too low, such as 5ms, can cause Storage I/O Control to become active too frequently and aggressively, potentially throttling I/O even under normal load, which might negatively impact overall performance rather than improve it.

High device latency frequently stems from contention at the physical storage layer. By ensuring that datastores are backed by independent physical spindles, the system reduces resource contention, allowing each datastore to operate with less interference and consequently improving I/O performance and reducing latency.

Using shared spindles for multiple datastores increases contention for underlying physical I/O resources, which would exacerbate device latency and storage performance issues, rather than improving them.