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RWH Policy
Press <Enter> and the following screen will appear. If any device has been set as a journaling
drive (see pages 202 and 203), the options are Distributed PPL, Journaling Drive, and
Disable.
If no device has been set as a journaling drive, the options are Distributed PPL and Disable.
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. While a power/
drive-failure/crash occurring, 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.
Appendix E: Configuring VROC RAID Settings
205
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