rgw: add the description of blocking io during index resharding

It's nice to describe that write I/Os are blocked during resharding.

Signed-off-by: Satoru Takeuchi <satoru.takeuchi@gmail.com>

diff --git a/doc/radosgw/dynamicresharding.rst b/doc/radosgw/dynamicresharding.rst
index a7698e7bbc9325d49ffe6ed3eea4e35b9eb4fc56..19a2a2b468284841cc79aeaa2f40ae99538abd6e 100644 (file)
--- a/doc/radosgw/dynamicresharding.rst
+++ b/doc/radosgw/dynamicresharding.rst
@@ -18,7 +18,8 @@ exceeded the system can suffer from performance issues. The dynamic
 resharding feature detects this situation and automatically increases
 the number of shards used by the bucket index, resulting in a
 reduction of the number of entries in each bucket index shard. This
-process is transparent to the user.
+process is transparent to the user. Write I/Os to the target bucket
+are blocked and read I/Os are not during resharding process.
 
 By default dynamic bucket index resharding can only increase the
 number of bucket index shards to 1999, although this upper-bound is a