config: Add small note about default number of PGs

It's still not clear to end users this should go into the
mon or global section of ceph.conf

Until this gets resolved document it here as well for the people
who look up their settings in the source code.

Signed-off-by: Wido den Hollander <wido@42on.com>

diff --git a/src/common/config_opts.h b/src/common/config_opts.h
index 58606d3c77fa74fa34db6095e9417739461faa86..3963b31aff98a5ddc7a9c39c94ecd1889507fadd 100644 (file)
--- a/src/common/config_opts.h
+++ b/src/common/config_opts.h
@@ -319,8 +319,8 @@ OPTION(osd_max_rep, OPT_INT, 10)
 OPTION(osd_pool_default_crush_rule, OPT_INT, 0)
 OPTION(osd_pool_default_size, OPT_INT, 2)
 OPTION(osd_pool_default_min_size, OPT_INT, 0)  // 0 means no specific default; ceph will use size-size/2
-OPTION(osd_pool_default_pg_num, OPT_INT, 8)
-OPTION(osd_pool_default_pgp_num, OPT_INT, 8)
+OPTION(osd_pool_default_pg_num, OPT_INT, 8) // number of PGs for new pools. Configure in global or mon section of ceph.conf
+OPTION(osd_pool_default_pgp_num, OPT_INT, 8) // number of PGs for placement purposes. Should be equal to pg_num
 OPTION(osd_map_dedup, OPT_BOOL, true)
 OPTION(osd_map_cache_size, OPT_INT, 500)
 OPTION(osd_map_message_max, OPT_INT, 100)  // max maps per MOSDMap message