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authorLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 22:03:38 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 22:03:38 +0300
commit040639b7fcf73ee39c15d38257f652a2048e96f2 (patch)
tree7b2b5e7f6af28818e10cd5658d679b236a78d884 /Documentation
parent20c59c71ae711aff845eef640b25935bc9578c93 (diff)
parent1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 (diff)
downloadlinux-040639b7fcf73ee39c15d38257f652a2048e96f2.tar.xz
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md
Pull MD updates from Shaohua Li: "Some small fixes for MD: - fix raid5-cache potential problems if raid5 cache isn't fully recovered - fix a wait-within-wait warning in raid1/10 - make raid5-PPL support disks with writeback cache enabled" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md: raid5-ppl: PPL support for disks with write-back cache enabled md/r5cache: print more info of log recovery md/raid1,raid10: silence warning about wait-within-wait md: introduce new personality funciton start()
Diffstat (limited to 'Documentation')
-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.