Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/doc/rados/configuration/pool-pg.conf b/doc/rados/configuration/pool-pg.conf
new file mode 100644
index 000000000..6765d37df
--- /dev/null
+++ b/doc/rados/configuration/pool-pg.conf
@@ -0,0 +1,21 @@
+[global]
+
+	# By default, Ceph makes three replicas of RADOS objects. If you want
+	# to maintain four copies of an object the default value--a primary
+	# copy and three replica copies--reset the default values as shown in
+	# 'osd_pool_default_size'. If you want to allow Ceph to accept an I/O
+	# operation to a degraded PG, set 'osd_pool_default_min_size' to a
+	# number less than the 'osd_pool_default_size' value.
+
+	osd_pool_default_size = 3  # Write an object three times.
+	osd_pool_default_min_size = 2 # Accept an I/O operation to a PG that has two copies of an object.
+
+	# Note: by default, PG autoscaling is enabled and this value is used only
+	# in specific circumstances. It is however still recommend to set it.
+	# Ensure you have a realistic number of placement groups. We recommend
+	# approximately 100 per OSD. E.g., total number of OSDs multiplied by 100
+	# divided by the number of replicas (i.e., 'osd_pool_default_size'). So for
+	# 10 OSDs and 'osd_pool_default_size' = 4, we'd recommend approximately
+	# (100 * 10) / 4 = 250.
+	# Always use the nearest power of two.
+	osd_pool_default_pg_num = 256