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RWH Policy
Press <Enter> and the following screen will appear. If any device(s) from the list of Non-RAID
Physical Disks has(have) been set as journal disk(s) (see pages 140 and 141), the options
are Distributed PPL, Journaling Drive, and Disable.
If none from the list of Non-RAID Physical Disks has been set as a journal disk (see pages
140 and 141), 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 RWH closure algorithm provides
the option of use of an additional NVMe device for RAID volume rebuilds (Journal-
ing 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 B: Configuring VROC RAID Settings
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