Supermicro X12 Series User Manual page 36

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Super Intel VROC RAID Configuration for the X12 Motherboards User's Guide

RWH Policy

The options for RWH Policy are Distributed PPL, Journaling Drive, and Disable. (Please

note that If no device has been set as a journaling drive, the options are Distributed PPL and

Disable.) Select Journaling Drive from the screen above and press <Enter>, the following

screen will display:

Note 1: Partial parity logging (PPL) can be defined as the result of XOR calculation of

old data and old parity. PPL is a feature available for RAID5 volumes. When a power/

drive-failure or crash occurs, PPL information helps rebuild the RAID volume and re-

duce the potential data loss.

Note 2: For the RWH condition, the Intel® RSTe 5.X or above RWH closure algorithm

provides the option of use of an additional NVMe device for RAID volume rebuilds

(Journaling Drive RWH closure mode). Without the use of an additional NVMe device,

PPL distributed RWH closure mode can be utilized to close the RWH by using the parity

drive for example.

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