[Pkg-ceph-commits] [ceph] 01/01: Clarification about setting the hashpspool flag

[Gaudenz Steinlin]

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gaudenz pushed a commit to branch experimental
in repository ceph.

commit a2990e1d9f6eac1755e38dcfd18c4fe7cfa6ab07
Author: Gaudenz Steinlin <gaudenz at debian.org>
Date:   Mon Nov 17 10:59:14 2014 +0100

    Clarification about setting the hashpspool flag
---
 debian/README.Debian | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/debian/README.Debian b/debian/README.Debian
index f4ba80a..be21ad7 100644
--- a/debian/README.Debian
+++ b/debian/README.Debian
@@ -43,10 +43,17 @@
 
  * (Restart MDSes).
 
- * Set 'hashpspool' flag on your pools (new default):
+ * Consider setting the 'hashpspool' flag on your pools (new default):
 
     ceph osd pool set {pool} hashpspool true
 
+    This changes the pool to use a new hashing algorithm for the distribution of
+    Placement Groups (PGs) to OSDs. This new algorithm ensures a better distribution
+    to all OSDs. Be aware that this change will temporarly put some of your PGs into
+    "misplaced" state and cause additional I/O until all PGs are moved to their new
+    location. See http://tracker.ceph.com/issues/4128 for the details about the new
+    algorithm.
+
  Read more about tunables in
 
     http://ceph.com/docs/master/rados/operations/crush-map/#tunables

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