diff --git a/cmd/zarcstat.in b/cmd/zarcstat.in
index 8ffd2048116..ad0e12e9fbf 100755
--- a/cmd/zarcstat.in
+++ b/cmd/zarcstat.in
@@ -565,10 +565,10 @@ def init():
 
     update_hdr_intr()
 
-    # check if L2ARC exists
+    # check if L2ARC exists; fall back to l2_size for older kernels that
+    # do not export l2_ndev
     snap_stats()
-    l2_size = cur.get("l2_size")
-    if l2_size:
+    if cur.get("l2_ndev") or cur.get("l2_size"):
         l2exist = True
 
     if desired_cols:
diff --git a/cmd/zarcsummary b/cmd/zarcsummary
index 24a129d9ca7..5b6e35465ea 100755
--- a/cmd/zarcsummary
+++ b/cmd/zarcsummary
@@ -856,7 +856,10 @@ def section_l2arc(kstats_dict):
     # The L2ARC statistics live in the same section as the normal ARC stuff
     arc_stats = isolate_section('arcstats', kstats_dict)
 
-    if arc_stats['l2_size'] == '0':
+    # Skip the section only when no cache device is attached. Fall back to
+    # l2_size for older kernels that do not export l2_ndev.
+    if arc_stats.get('l2_ndev', '0') == '0' and \
+            arc_stats['l2_size'] == '0':
         print('L2ARC not detected, skipping section\n')
         return
 
diff --git a/include/sys/arc_impl.h b/include/sys/arc_impl.h
index dbe712e2e73..8fde5c4fe50 100644
--- a/include/sys/arc_impl.h
+++ b/include/sys/arc_impl.h
@@ -832,6 +832,8 @@ typedef struct arc_stats {
 	 * due to ARC_FLAG_UNCACHED being set.
 	 */
 	kstat_named_t arcstat_uncached_evictable_metadata;
+	/* Number of L2ARC devices currently attached across all pools. */
+	kstat_named_t arcstat_l2_ndev;
 	kstat_named_t arcstat_l2_hits;
 	kstat_named_t arcstat_l2_misses;
 	/*
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 053314db185..22b189d5bb8 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -586,6 +586,7 @@ arc_stats_t arc_stats = {
 	{ "uncached_metadata",		KSTAT_DATA_UINT64 },
 	{ "uncached_evictable_data",	KSTAT_DATA_UINT64 },
 	{ "uncached_evictable_metadata", KSTAT_DATA_UINT64 },
+	{ "l2_ndev",			KSTAT_DATA_UINT64 },
 	{ "l2_hits",			KSTAT_DATA_UINT64 },
 	{ "l2_misses",			KSTAT_DATA_UINT64 },
 	{ "l2_prefetch_asize",		KSTAT_DATA_UINT64 },
@@ -7440,6 +7441,7 @@ arc_kstat_update(kstat_t *ksp, int rw)
 	    aggsum_value(&arc_sums.arcstat_dnode_size);
 	as->arcstat_bonus_size.value.ui64 =
 	    wmsum_value(&arc_sums.arcstat_bonus_size);
+	as->arcstat_l2_ndev.value.ui64 = l2arc_ndev;
 	as->arcstat_l2_hits.value.ui64 =
 	    wmsum_value(&arc_sums.arcstat_l2_hits);
 	as->arcstat_l2_misses.value.ui64 =