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Dell PowerEdge RAID Controller S140 User’s Guide

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Virtual disk cache policies

NOTE:Configuring virtual disk cache policies on NVMe PCIe SSD is not supported.

The PERC S140 uses part of system memory for cache. It supports the following cache options:

  • Read Ahead/Write Back
  • No Read Ahead/Write Back
  • Read Ahead/Write Through
  • No Read Ahead/Write Through
Table 1. Read, Write, and Cache Policy for the PERC S140 Read, Write, and Cache Policy to the PERC S140
Category Supported by S140 controller
Cache settings Yes
Read Ahead/Write Back Yes
No Read Ahead/Write Back Yes
Read Ahead/Write Through Yes
No Read Ahead/Write Through Yes
NOTE: The current default for Write-Cache mode enablement is Write Through, No Read Ahead (WT, NRA). To enable Write Back (WB), a UPS is recommended.
NOTE: For more information about the physical disk write cache policy behavior, see Troubleshooting your system

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