168
Yes and No.
Note:
logging (PPL) can reduce the potential data loss. Refer to the following illustration for
Disk1
Journaling
Drive
(Data)
Disk2
(Data)
Disk3
(Data)
Disk4
(Parity)
RAID SW for Read-modify-write Case
(PPL)
Partial parity logging (PPL) = old data XOR old parity
New parity = new data XOR PPL
(read) old parity
XOR operation
(write) new parity
Store PPL to the journaling drive
(read) old data
XOR operation
(write) new data
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