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-rw-r--r--Documentation/md/raid5-ppl.txt7
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/md/raid5-ppl.txt b/Documentation/md/raid5-ppl.txt
index 127072b09363..bfa092589e00 100644
--- a/Documentation/md/raid5-ppl.txt
+++ b/Documentation/md/raid5-ppl.txt
@@ -39,6 +39,7 @@ case the behavior is the same as in plain raid5.
PPL is available for md version-1 metadata and external (specifically IMSM)
metadata arrays. It can be enabled using mdadm option --consistency-policy=ppl.
-Currently, volatile write-back cache should be disabled on all member drives
-when using PPL. Otherwise it cannot guarantee consistency in case of power
-failure.
+There is a limitation of maximum 64 disks in the array for PPL. It allows to
+keep data structures and implementation simple. RAID5 arrays with so many disks
+are not likely due to high risk of multiple disks failure. Such restriction
+should not be a real life limitation.