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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-31 11:03:38 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-31 11:03:38 -0800 |
| commit | 040639b7fcf73ee39c15d38257f652a2048e96f2 (patch) | |
| tree | 7b2b5e7f6af28818e10cd5658d679b236a78d884 /Documentation | |
| parent | Merge tag 'xfs-4.16-merge-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux (diff) | |
| parent | raid5-ppl: PPL support for disks with write-back cache enabled (diff) | |
| download | linux-dev-040639b7fcf73ee39c15d38257f652a2048e96f2.tar.xz linux-dev-040639b7fcf73ee39c15d38257f652a2048e96f2.zip | |
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.txt | 7 |
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. |