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Dell PowerEdge RAID Controller S140 User’s Guide

Performance degradation after disabling SATA physical disk write cache policy

Likely Cause:
Disk write operations can cause degradation in performance.
Corrective Action:
To resolve this issue, enable the physical disk write cache policy.
NOTE:Ensure that there is constant power supply to the system (A UPS is recommended).
NOTE: If you create a virtual disk using Dell LifeCycle controller, then the physical disk write cache policy is set to default. For more information about the physical disk write cache policy behavior, see the Managing the physical disk write cache policy for SATA drives section.

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