diff --git a/src/osd/osd_types_fmt.h b/src/osd/osd_types_fmt.h
index 58a634f70ca..cb54572c8e2 100644
--- a/src/osd/osd_types_fmt.h
+++ b/src/osd/osd_types_fmt.h
@@ -114,7 +114,7 @@ struct fmt::formatter<pg_t> {
   template <typename FormatContext>
   auto format(const pg_t& pg, FormatContext& ctx)
   {
-    return fmt::format_to(ctx.out(), "{}.{}", pg.pool(), pg.m_seed);
+    return fmt::format_to(ctx.out(), "{}.{:x}", pg.pool(), pg.m_seed);
   }
 };
 
diff --git a/src/osd/scrubber/pg_scrubber.cc b/src/osd/scrubber/pg_scrubber.cc
index f424d3e52d6..bcf74d0e439 100644
--- a/src/osd/scrubber/pg_scrubber.cc
+++ b/src/osd/scrubber/pg_scrubber.cc
@@ -2145,6 +2145,10 @@ PgScrubber::PgScrubber(PG* pg)
 void PgScrubber::set_scrub_begin_time()
 {
   scrub_begin_stamp = ceph_clock_now();
+  m_osds->clog->debug() << fmt::format(
+    "{} {} starts",
+    m_pg->info.pgid.pgid,
+    m_mode_desc);
 }
 
 void PgScrubber::set_scrub_duration()