diff --git a/src/include/homeobject/homeobject.hpp b/src/include/homeobject/homeobject.hpp
index 1b49125..2eef7d2 100644
--- a/src/include/homeobject/homeobject.hpp
+++ b/src/include/homeobject/homeobject.hpp
@@ -57,9 +57,10 @@ struct HomeObjectStats {
     uint64_t used_capacity_bytes{0};
     uint32_t num_open_shards{0};
     uint32_t avail_open_shards{0};
+    uint32_t num_disks{0};
     std::string to_string() const {
-        return fmt::format("total_capacity_bytes={}, used_capacity_bytes={}, num_open_shards={}, avail_open_shards={}",
-                           total_capacity_bytes, used_capacity_bytes, num_open_shards, avail_open_shards);
+        return fmt::format("total_capacity_bytes={}, used_capacity_bytes={}, num_open_shards={}, avail_open_shards={}, num_disks={}",
+                           total_capacity_bytes, used_capacity_bytes, num_open_shards, avail_open_shards, num_disks);
     }
 };
 
diff --git a/src/include/homeobject/pg_manager.hpp b/src/include/homeobject/pg_manager.hpp
index e6ea614..a8874cc 100644
--- a/src/include/homeobject/pg_manager.hpp
+++ b/src/include/homeobject/pg_manager.hpp
@@ -34,6 +34,7 @@ struct PGInfo {
     pg_id_t id;
     mutable MemberSet members;
     peer_id_t replica_set_uuid;
+    u_int64_t size;
 
     auto operator<=>(PGInfo const& rhs) const { return id <=> rhs.id; }
     auto operator==(PGInfo const& rhs) const { return id == rhs.id; }
@@ -51,6 +52,7 @@ struct PGStats {
     uint64_t avail_bytes;           // total number of bytes available on this PG;
     uint64_t num_active_objects;    // total number of active objects on this PG;
     uint64_t num_tombstone_objects; // total number of tombstone objects on this PG;
+    uint64_t pg_state;              // PG state;
     std::vector<
         std::tuple< peer_id_t, std::string, uint64_t /* last_commit_lsn */, uint64_t /* last_succ_resp_us_ */ > >
         members;
@@ -76,7 +78,7 @@ struct PGStats {
 class PGManager : public Manager< PGError > {
 public:
     virtual NullAsyncResult create_pg(PGInfo&& pg_info) = 0;
-    virtual NullAsyncResult replace_member(pg_id_t id, peer_id_t const& old_member, PGMember const& new_member) = 0;
+    virtual NullAsyncResult replace_member(pg_id_t id, peer_id_t const& old_member, PGMember const& new_member, u_int32_t const& commit_quorum) = 0;
 
     /**
      * Retrieves the statistics for a specific PG (Placement Group) identified by its ID.
diff --git a/src/lib/homeobject_impl.hpp b/src/lib/homeobject_impl.hpp
index 731198e..7619f2e 100644
--- a/src/lib/homeobject_impl.hpp
+++ b/src/lib/homeobject_impl.hpp
@@ -145,7 +145,7 @@ class HomeObjectImpl : public HomeObject,
     /// PgManager
     PGManager::NullAsyncResult create_pg(PGInfo&& pg_info) final;
     PGManager::NullAsyncResult replace_member(pg_id_t id, peer_id_t const& old_member,
-                                              PGMember const& new_member) final;
+                                              PGMember const& new_member, u_int32_t const& commit_quorum) final;
     // see api comments in base class;
     bool get_stats(pg_id_t id, PGStats& stats) const final;
     void get_pg_ids(std::vector< pg_id_t >& pg_ids) const final;
diff --git a/src/lib/pg_manager.cpp b/src/lib/pg_manager.cpp
index f38410f..6645d9a 100644
--- a/src/lib/pg_manager.cpp
+++ b/src/lib/pg_manager.cpp
@@ -21,7 +21,7 @@ PGManager::NullAsyncResult HomeObjectImpl::create_pg(PGInfo&& pg_info) {
 }
 
 PGManager::NullAsyncResult HomeObjectImpl::replace_member(pg_id_t id, peer_id_t const& old_member,
-                                                          PGMember const& new_member) {
+                                                          PGMember const& new_member, u_int32_t const& commit_quorum) {
     LOGI("[pg={}] replace member [{}] with [{}]", id, to_string(old_member), to_string(new_member.id));
     if (old_member == new_member.id) {
         LOGW("rejecting identical replacement SvcId [{}]!", to_string(old_member));
diff --git a/src/lib/tests/PGManagerTest.cpp b/src/lib/tests/PGManagerTest.cpp
index 6afef29..c079454 100644
--- a/src/lib/tests/PGManagerTest.cpp
+++ b/src/lib/tests/PGManagerTest.cpp
@@ -33,25 +33,25 @@ TEST_F(TestFixture, CreateDuplicatePg) {
 TEST_F(TestFixture, Migrate) {
     EXPECT_EQ(homeobj_->pg_manager()
                   ->replace_member(UINT16_MAX, boost::uuids::random_generator()(),
-                                   PGMember{boost::uuids::random_generator()()})
+                                   PGMember{boost::uuids::random_generator()()}, 0)
                   .get()
                   .error(),
               PGError::UNSUPPORTED_OP);
     EXPECT_EQ(
         homeobj_->pg_manager()
-            ->replace_member(_pg_id, boost::uuids::random_generator()(), PGMember{boost::uuids::random_generator()()})
+            ->replace_member(_pg_id, boost::uuids::random_generator()(), PGMember{boost::uuids::random_generator()()}, 0)
             .get()
             .error(),
         PGError::UNSUPPORTED_OP);
-    EXPECT_EQ(homeobj_->pg_manager()->replace_member(_pg_id, _peer1, PGMember{_peer1}).get().error(),
+    EXPECT_EQ(homeobj_->pg_manager()->replace_member(_pg_id, _peer1, PGMember{_peer1}).get().error(), 0,
               PGError::INVALID_ARG);
-    EXPECT_EQ(homeobj_->pg_manager()->replace_member(_pg_id, _peer1, PGMember{_peer2}).get().error(),
+    EXPECT_EQ(homeobj_->pg_manager()->replace_member(_pg_id, _peer1, PGMember{_peer2}).get().error(), 0,
               PGError::INVALID_ARG);
     EXPECT_EQ(homeobj_->pg_manager()
-                  ->replace_member(_pg_id, _peer1, PGMember{boost::uuids::random_generator()()})
+                  ->replace_member(_pg_id, _peer1, PGMember{boost::uuids::random_generator()()}, 0)
                   .get()
                   .error(),
               PGError::INVALID_ARG);
     EXPECT_FALSE(
-        homeobj_->pg_manager()->replace_member(_pg_id, _peer2, PGMember{boost::uuids::random_generator()()}).get());
+        homeobj_->pg_manager()->replace_member(_pg_id, _peer2, PGMember{boost::uuids::random_generator()()}).get(), 0);
 }