Supermicro X11DPG-HGX2 User Manual page 165

The feature, Mark as Journaling Drive, allows the user to set the selected NVMe device as a
journaling drive. Use the arrow keys to select Mark as Journaling Drive and press <Enter>.
The following screen will appear. The options are Yes and No.
Note: RAID Write Hole (RWH) is a condition associated with a power/drive-failure/crash
while writing to a RAID5 volume. The use of journaling drive that contains partial parity
logging (PPL) can reduce the potential data loss. Refer to the following illustration for
the use of journaling drive.
Journaling
Drive
(PPL)
Store PPL to the journaling drive
Appendix D: Configuring VROC RAID Settings
RAID SW for Read-modify-write Case
(read) old data
XOR operation
(write) new data
Disk1 Disk2
(Data) (Data)
Partial parity logging (PPL) = old data XOR old parity
New parity = new data XOR PPL
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(read) old parity
XOR operation
(write) new parity
Disk3 Disk4
(Data) (Parity)