diff --git a/src/include/daos_obj_class.h b/src/include/daos_obj_class.h
index 9c5b89a4989..0b7ff7c54c0 100644
--- a/src/include/daos_obj_class.h
+++ b/src/include/daos_obj_class.h
@@ -1,5 +1,6 @@
 /**
  * (C) Copyright 2015-2024 Intel Corporation.
+ * (C) Copyright 2025 Hewlett Packard Enterprise Development LP
  *
  * SPDX-License-Identifier: BSD-2-Clause-Patent
  */
@@ -60,8 +61,11 @@ enum daos_obj_redun {
 	 * Examples:
 	 * - 2P1: 2+1 EC object
 	 * - 4P2: 4+2 EC object
+	 * - 4P3: 4+3 EC object
 	 * - 8P2: 8+2 EC object
+	 * - 8P3: 8+3 EC object
 	 * - 16P2: 16+2 EC object
+	 * - 16P3: 16+3 EC object
 	 */
 	OR_RS_2P1 = 32,
 	OR_RS_2P2,
@@ -71,6 +75,9 @@ enum daos_obj_redun {
 	OR_RS_8P2,
 	OR_RS_16P1,
 	OR_RS_16P2,
+	OR_RS_4P3,
+	OR_RS_8P3,
+	OR_RS_16P3,
 
 	/*
 	 * Predefined object classes that can be used directly by the API user.
@@ -340,6 +347,17 @@ enum daos_obj_redun {
 	OC_EC_4P2G32 = OBJ_CLASS_DEF(OR_RS_4P2, 32ULL),
 	OC_EC_4P2GX  = OBJ_CLASS_DEF(OR_RS_4P2, MAX_NUM_GROUPS),
 
+	/** EC 4+3 object classes */
+	OC_EC_4P3G1  = OBJ_CLASS_DEF(OR_RS_4P3, 1ULL),
+	OC_EC_4P3G2  = OBJ_CLASS_DEF(OR_RS_4P3, 2ULL),
+	OC_EC_4P3G4  = OBJ_CLASS_DEF(OR_RS_4P3, 4ULL),
+	OC_EC_4P3G6  = OBJ_CLASS_DEF(OR_RS_4P3, 6ULL),
+	OC_EC_4P3G8  = OBJ_CLASS_DEF(OR_RS_4P3, 8ULL),
+	OC_EC_4P3G12 = OBJ_CLASS_DEF(OR_RS_4P3, 12ULL),
+	OC_EC_4P3G16 = OBJ_CLASS_DEF(OR_RS_4P3, 16ULL),
+	OC_EC_4P3G32 = OBJ_CLASS_DEF(OR_RS_4P3, 32ULL),
+	OC_EC_4P3GX  = OBJ_CLASS_DEF(OR_RS_4P3, MAX_NUM_GROUPS),
+
 	/** EC 8+1 object classes */
 	OC_EC_8P1G1  = OBJ_CLASS_DEF(OR_RS_8P1, 1ULL),
 	OC_EC_8P1G2  = OBJ_CLASS_DEF(OR_RS_8P1, 2ULL),
@@ -362,6 +380,17 @@ enum daos_obj_redun {
 	OC_EC_8P2G32 = OBJ_CLASS_DEF(OR_RS_8P2, 32ULL),
 	OC_EC_8P2GX  = OBJ_CLASS_DEF(OR_RS_8P2, MAX_NUM_GROUPS),
 
+	/** EC 8+3 object classes */
+	OC_EC_8P3G1  = OBJ_CLASS_DEF(OR_RS_8P3, 1ULL),
+	OC_EC_8P3G2  = OBJ_CLASS_DEF(OR_RS_8P3, 2ULL),
+	OC_EC_8P3G4  = OBJ_CLASS_DEF(OR_RS_8P3, 4ULL),
+	OC_EC_8P3G6  = OBJ_CLASS_DEF(OR_RS_8P3, 6ULL),
+	OC_EC_8P3G8  = OBJ_CLASS_DEF(OR_RS_8P3, 8ULL),
+	OC_EC_8P3G12 = OBJ_CLASS_DEF(OR_RS_8P3, 12ULL),
+	OC_EC_8P3G16 = OBJ_CLASS_DEF(OR_RS_8P3, 16ULL),
+	OC_EC_8P3G32 = OBJ_CLASS_DEF(OR_RS_8P3, 32ULL),
+	OC_EC_8P3GX  = OBJ_CLASS_DEF(OR_RS_8P3, MAX_NUM_GROUPS),
+
 	/** EC 16+1 object classes */
 	OC_EC_16P1G1  = OBJ_CLASS_DEF(OR_RS_16P1, 1ULL),
 	OC_EC_16P1G2  = OBJ_CLASS_DEF(OR_RS_16P1, 2ULL),
@@ -384,6 +413,17 @@ enum daos_obj_redun {
 	OC_EC_16P2G32 = OBJ_CLASS_DEF(OR_RS_16P2, 32ULL),
 	OC_EC_16P2GX  = OBJ_CLASS_DEF(OR_RS_16P2, MAX_NUM_GROUPS),
 
+	/** EC 16+3 object classes */
+	OC_EC_16P3G1  = OBJ_CLASS_DEF(OR_RS_16P3, 1ULL),
+	OC_EC_16P3G2  = OBJ_CLASS_DEF(OR_RS_16P3, 2ULL),
+	OC_EC_16P3G4  = OBJ_CLASS_DEF(OR_RS_16P3, 4ULL),
+	OC_EC_16P3G6  = OBJ_CLASS_DEF(OR_RS_16P3, 6ULL),
+	OC_EC_16P3G8  = OBJ_CLASS_DEF(OR_RS_16P3, 8ULL),
+	OC_EC_16P3G12 = OBJ_CLASS_DEF(OR_RS_16P3, 12ULL),
+	OC_EC_16P3G16 = OBJ_CLASS_DEF(OR_RS_16P3, 16ULL),
+	OC_EC_16P3G32 = OBJ_CLASS_DEF(OR_RS_16P3, 32ULL),
+	OC_EC_16P3GX  = OBJ_CLASS_DEF(OR_RS_16P3, MAX_NUM_GROUPS),
+
 	/** Class ID equal or higher than this is reserved */
 	OC_RESERVED = 1 << 30,
 
diff --git a/src/object/obj_class_def.c b/src/object/obj_class_def.c
index db29e6bb33c..ba20da7a7bb 100644
--- a/src/object/obj_class_def.c
+++ b/src/object/obj_class_def.c
@@ -1,5 +1,6 @@
 /**
- * (C) Copyright 2021-2022 Intel Corporation.
+ * (C) Copyright 2021-2024 Intel Corporation.
+ * (C) Copyright 2025 Hewlett Packard Enterprise Development LP
  *
  * SPDX-License-Identifier: BSD-2-Clause-Patent
  */
@@ -140,172 +141,202 @@
 }
 
 struct daos_obj_class daos_obj_classes[] = {
-	/* single replica classes */
-	OC_SS_DEF(1),
-	OC_SS_DEF(2),
-	OC_SS_DEF(4),
-	OC_SS_DEF(6),
-	OC_SS_DEF(8),
-	OC_SS_DEF(12),
-	OC_SS_DEF(16),
-	OC_SS_DEF(32),
-	OC_SS_DEF_GX(),
-
-	/* 2-replica classes */
-	OC_RP_DEF(2, 1),
-	OC_RP_DEF(2, 2),
-	OC_RP_DEF(2, 4),
-	OC_RP_DEF(2, 6),
-	OC_RP_DEF(2, 8),
-	OC_RP_DEF(2, 12),
-	OC_RP_DEF(2, 16),
-	OC_RP_DEF(2, 32),
-	OC_RP_DEF_GX(2),
-
-	/* 3-replica classes */
-	OC_RP_DEF(3, 1),
-	OC_RP_DEF(3, 2),
-	OC_RP_DEF(3, 4),
-	OC_RP_DEF(3, 6),
-	OC_RP_DEF(3, 8),
-	OC_RP_DEF(3, 12),
-	OC_RP_DEF(3, 16),
-	OC_RP_DEF(3, 32),
-	OC_RP_DEF_GX(3),
-
-	/* 4-replica classes */
-	OC_RP_DEF(4, 1),
-	OC_RP_DEF(4, 2),
-	OC_RP_DEF(4, 4),
-	OC_RP_DEF(4, 6),
-	OC_RP_DEF(4, 8),
-	OC_RP_DEF(4, 12),
-	OC_RP_DEF(4, 16),
-	OC_RP_DEF(4, 32),
-	OC_RP_DEF_GX(4),
-
-	/* 5-replica classes */
-	OC_RP_DEF(5, 1),
-	OC_RP_DEF(5, 2),
-	OC_RP_DEF(5, 4),
-	OC_RP_DEF(5, 6),
-	OC_RP_DEF(5, 8),
-	OC_RP_DEF(5, 12),
-	OC_RP_DEF(5, 16),
-	OC_RP_DEF(5, 32),
-	OC_RP_DEF_GX(5),
-
-	/* 6-replica classes */
-	OC_RP_DEF(6, 1),
-	OC_RP_DEF(6, 2),
-	OC_RP_DEF(6, 4),
-	OC_RP_DEF(6, 6),
-	OC_RP_DEF(6, 8),
-	OC_RP_DEF(6, 12),
-	OC_RP_DEF(6, 16),
-	OC_RP_DEF(6, 32),
-	OC_RP_DEF_GX(6),
-
-	/* extremely scalable fetch */
-	OC_RP_XSF(),
-
-	/* EC(2+1) classes */
-	OC_EC_DEF(2, 1, 1),
-	OC_EC_DEF(2, 1, 2),
-	OC_EC_DEF(2, 1, 4),
-	OC_EC_DEF(2, 1, 8),
-	OC_EC_DEF(2, 1, 12),
-	OC_EC_DEF(2, 1, 16),
-	OC_EC_DEF(2, 1, 32),
-	OC_EC_DEF_GX(2, 1),
-
-	/* EC(2+2) classes */
-	OC_EC_DEF(2, 2, 1),
-	OC_EC_DEF(2, 2, 2),
-	OC_EC_DEF(2, 2, 4),
-	OC_EC_DEF(2, 2, 8),
-	OC_EC_DEF(2, 2, 12),
-	OC_EC_DEF(2, 2, 16),
-	OC_EC_DEF(2, 2, 32),
-	OC_EC_DEF_GX(2, 2),
-
-	/* EC(4+1) classes */
-	OC_EC_DEF(4, 1, 1),
-	OC_EC_DEF(4, 1, 2),
-	OC_EC_DEF(4, 1, 4),
-	OC_EC_DEF(4, 1, 8),
-	OC_EC_DEF(4, 1, 12),
-	OC_EC_DEF(4, 1, 16),
-	OC_EC_DEF(4, 1, 32),
-	OC_EC_DEF_GX(4, 1),
-
-	/* EC(4+2) classes */
-	OC_EC_DEF(4, 2, 1),
-	OC_EC_DEF(4, 2, 2),
-	OC_EC_DEF(4, 2, 4),
-	OC_EC_DEF(4, 2, 8),
-	OC_EC_DEF(4, 2, 12),
-	OC_EC_DEF(4, 2, 16),
-	OC_EC_DEF(4, 2, 32),
-	OC_EC_DEF_GX(4, 2),
-
-	/* EC(8+1) classes */
-	OC_EC_DEF(8, 1, 1),
-	OC_EC_DEF(8, 1, 2),
-	OC_EC_DEF(8, 1, 4),
-	OC_EC_DEF(8, 1, 8),
-	OC_EC_DEF(8, 1, 12),
-	OC_EC_DEF(8, 1, 16),
-	OC_EC_DEF(8, 1, 32),
-	OC_EC_DEF_GX(8, 1),
-
-	/* EC(8+2) classes */
-	OC_EC_DEF(8, 2, 1),
-	OC_EC_DEF(8, 2, 2),
-	OC_EC_DEF(8, 2, 4),
-	OC_EC_DEF(8, 2, 8),
-	OC_EC_DEF(8, 2, 12),
-	OC_EC_DEF(8, 2, 16),
-	OC_EC_DEF(8, 2, 32),
-	OC_EC_DEF_GX(8, 2),
-
-	/* EC(16+1) classes */
-	OC_EC_DEF(16, 1, 1),
-	OC_EC_DEF(16, 1, 2),
-	OC_EC_DEF(16, 1, 4),
-	OC_EC_DEF(16, 1, 8),
-	OC_EC_DEF(16, 1, 12),
-	OC_EC_DEF(16, 1, 16),
-	OC_EC_DEF(16, 1, 32),
-	OC_EC_DEF_GX(16, 1),
-
-	/* EC(16+2) classes */
-	OC_EC_DEF(16, 2, 1),
-	OC_EC_DEF(16, 2, 2),
-	OC_EC_DEF(16, 2, 4),
-	OC_EC_DEF(16, 2, 8),
-	OC_EC_DEF(16, 2, 12),
-	OC_EC_DEF(16, 2, 16),
-	OC_EC_DEF(16, 2, 32),
-	OC_EC_DEF_GX(16, 2),
-
-	/* Internal classes: echo objects */
-	OC_RP_ECHO_DEF(1),
-	OC_RP_ECHO_DEF(2),
-	OC_RP_ECHO_DEF(3),
-	OC_RP_ECHO_DEF(4),
-
-	/* Internal classes: specified rank */
-	OC_RP_SRANK_DEF(1, 1),
-	OC_RP_SRANK_DEF(2, 1),
-	OC_RP_SRANK_DEF(3, 1),
-
-	/* The last one */
-	{
-		.oc_name	= NULL,
-		.oc_id		= OC_UNKNOWN,
-		.oc_private	= true,
-	},
+    /* single replica classes */
+    OC_SS_DEF(1),
+    OC_SS_DEF(2),
+    OC_SS_DEF(4),
+    OC_SS_DEF(6),
+    OC_SS_DEF(8),
+    OC_SS_DEF(12),
+    OC_SS_DEF(16),
+    OC_SS_DEF(32),
+    OC_SS_DEF_GX(),
+
+    /* 2-replica classes */
+    OC_RP_DEF(2, 1),
+    OC_RP_DEF(2, 2),
+    OC_RP_DEF(2, 4),
+    OC_RP_DEF(2, 6),
+    OC_RP_DEF(2, 8),
+    OC_RP_DEF(2, 12),
+    OC_RP_DEF(2, 16),
+    OC_RP_DEF(2, 32),
+    OC_RP_DEF_GX(2),
+
+    /* 3-replica classes */
+    OC_RP_DEF(3, 1),
+    OC_RP_DEF(3, 2),
+    OC_RP_DEF(3, 4),
+    OC_RP_DEF(3, 6),
+    OC_RP_DEF(3, 8),
+    OC_RP_DEF(3, 12),
+    OC_RP_DEF(3, 16),
+    OC_RP_DEF(3, 32),
+    OC_RP_DEF_GX(3),
+
+    /* 4-replica classes */
+    OC_RP_DEF(4, 1),
+    OC_RP_DEF(4, 2),
+    OC_RP_DEF(4, 4),
+    OC_RP_DEF(4, 6),
+    OC_RP_DEF(4, 8),
+    OC_RP_DEF(4, 12),
+    OC_RP_DEF(4, 16),
+    OC_RP_DEF(4, 32),
+    OC_RP_DEF_GX(4),
+
+    /* 5-replica classes */
+    OC_RP_DEF(5, 1),
+    OC_RP_DEF(5, 2),
+    OC_RP_DEF(5, 4),
+    OC_RP_DEF(5, 6),
+    OC_RP_DEF(5, 8),
+    OC_RP_DEF(5, 12),
+    OC_RP_DEF(5, 16),
+    OC_RP_DEF(5, 32),
+    OC_RP_DEF_GX(5),
+
+    /* 6-replica classes */
+    OC_RP_DEF(6, 1),
+    OC_RP_DEF(6, 2),
+    OC_RP_DEF(6, 4),
+    OC_RP_DEF(6, 6),
+    OC_RP_DEF(6, 8),
+    OC_RP_DEF(6, 12),
+    OC_RP_DEF(6, 16),
+    OC_RP_DEF(6, 32),
+    OC_RP_DEF_GX(6),
+
+    /* extremely scalable fetch */
+    OC_RP_XSF(),
+
+    /* EC(2+1) classes */
+    OC_EC_DEF(2, 1, 1),
+    OC_EC_DEF(2, 1, 2),
+    OC_EC_DEF(2, 1, 4),
+    OC_EC_DEF(2, 1, 8),
+    OC_EC_DEF(2, 1, 12),
+    OC_EC_DEF(2, 1, 16),
+    OC_EC_DEF(2, 1, 32),
+    OC_EC_DEF_GX(2, 1),
+
+    /* EC(2+2) classes */
+    OC_EC_DEF(2, 2, 1),
+    OC_EC_DEF(2, 2, 2),
+    OC_EC_DEF(2, 2, 4),
+    OC_EC_DEF(2, 2, 8),
+    OC_EC_DEF(2, 2, 12),
+    OC_EC_DEF(2, 2, 16),
+    OC_EC_DEF(2, 2, 32),
+    OC_EC_DEF_GX(2, 2),
+
+    /* EC(4+1) classes */
+    OC_EC_DEF(4, 1, 1),
+    OC_EC_DEF(4, 1, 2),
+    OC_EC_DEF(4, 1, 4),
+    OC_EC_DEF(4, 1, 8),
+    OC_EC_DEF(4, 1, 12),
+    OC_EC_DEF(4, 1, 16),
+    OC_EC_DEF(4, 1, 32),
+    OC_EC_DEF_GX(4, 1),
+
+    /* EC(4+2) classes */
+    OC_EC_DEF(4, 2, 1),
+    OC_EC_DEF(4, 2, 2),
+    OC_EC_DEF(4, 2, 4),
+    OC_EC_DEF(4, 2, 8),
+    OC_EC_DEF(4, 2, 12),
+    OC_EC_DEF(4, 2, 16),
+    OC_EC_DEF(4, 2, 32),
+    OC_EC_DEF_GX(4, 2),
+
+    /* EC(4+3) classes */
+    OC_EC_DEF(4, 3, 1),
+    OC_EC_DEF(4, 3, 2),
+    OC_EC_DEF(4, 3, 4),
+    OC_EC_DEF(4, 3, 8),
+    OC_EC_DEF(4, 3, 12),
+    OC_EC_DEF(4, 3, 16),
+    OC_EC_DEF(4, 3, 32),
+    OC_EC_DEF_GX(4, 3),
+
+    /* EC(8+1) classes */
+    OC_EC_DEF(8, 1, 1),
+    OC_EC_DEF(8, 1, 2),
+    OC_EC_DEF(8, 1, 4),
+    OC_EC_DEF(8, 1, 8),
+    OC_EC_DEF(8, 1, 12),
+    OC_EC_DEF(8, 1, 16),
+    OC_EC_DEF(8, 1, 32),
+    OC_EC_DEF_GX(8, 1),
+
+    /* EC(8+2) classes */
+    OC_EC_DEF(8, 2, 1),
+    OC_EC_DEF(8, 2, 2),
+    OC_EC_DEF(8, 2, 4),
+    OC_EC_DEF(8, 2, 8),
+    OC_EC_DEF(8, 2, 12),
+    OC_EC_DEF(8, 2, 16),
+    OC_EC_DEF(8, 2, 32),
+    OC_EC_DEF_GX(8, 2),
+
+    /* EC(8+3) classes */
+    OC_EC_DEF(8, 3, 1),
+    OC_EC_DEF(8, 3, 2),
+    OC_EC_DEF(8, 3, 4),
+    OC_EC_DEF(8, 3, 8),
+    OC_EC_DEF(8, 3, 12),
+    OC_EC_DEF(8, 3, 16),
+    OC_EC_DEF(8, 3, 32),
+    OC_EC_DEF_GX(8, 3),
+
+    /* EC(16+1) classes */
+    OC_EC_DEF(16, 1, 1),
+    OC_EC_DEF(16, 1, 2),
+    OC_EC_DEF(16, 1, 4),
+    OC_EC_DEF(16, 1, 8),
+    OC_EC_DEF(16, 1, 12),
+    OC_EC_DEF(16, 1, 16),
+    OC_EC_DEF(16, 1, 32),
+    OC_EC_DEF_GX(16, 1),
+
+    /* EC(16+2) classes */
+    OC_EC_DEF(16, 2, 1),
+    OC_EC_DEF(16, 2, 2),
+    OC_EC_DEF(16, 2, 4),
+    OC_EC_DEF(16, 2, 8),
+    OC_EC_DEF(16, 2, 12),
+    OC_EC_DEF(16, 2, 16),
+    OC_EC_DEF(16, 2, 32),
+    OC_EC_DEF_GX(16, 2),
+
+    /* EC(16+3) classes */
+    OC_EC_DEF(16, 3, 1),
+    OC_EC_DEF(16, 3, 2),
+    OC_EC_DEF(16, 3, 4),
+    OC_EC_DEF(16, 3, 8),
+    OC_EC_DEF(16, 3, 12),
+    OC_EC_DEF(16, 3, 16),
+    OC_EC_DEF(16, 3, 32),
+    OC_EC_DEF_GX(16, 3),
+
+    /* Internal classes: echo objects */
+    OC_RP_ECHO_DEF(1),
+    OC_RP_ECHO_DEF(2),
+    OC_RP_ECHO_DEF(3),
+    OC_RP_ECHO_DEF(4),
+
+    /* Internal classes: specified rank */
+    OC_RP_SRANK_DEF(1, 1),
+    OC_RP_SRANK_DEF(2, 1),
+    OC_RP_SRANK_DEF(3, 1),
+
+    /* The last one */
+    {
+	.oc_name    = NULL,
+	.oc_id      = OC_UNKNOWN,
+	.oc_private = true,
+    },
 };
 
 int
diff --git a/src/tests/ftest/erasurecode/aggregation.yaml b/src/tests/ftest/erasurecode/aggregation.yaml
index 3dc062ac002..5b289b7eaa5 100644
--- a/src/tests/ftest/erasurecode/aggregation.yaml
+++ b/src/tests/ftest/erasurecode/aggregation.yaml
@@ -52,4 +52,5 @@ ior:
       - ["EC_2P1G1", 4]
       - ["EC_4P1G1", 6]
       - ["EC_4P2G1", 6]
+      - ["EC_4P3G1", 7]
       - ["EC_8P2G1", 10]
diff --git a/src/tests/ftest/erasurecode/cell_size.yaml b/src/tests/ftest/erasurecode/cell_size.yaml
index b7757131daa..58891a50927 100644
--- a/src/tests/ftest/erasurecode/cell_size.yaml
+++ b/src/tests/ftest/erasurecode/cell_size.yaml
@@ -61,4 +61,4 @@ ior:
       - "EC_2P2GX"
       - "EC_4P1GX"
       - "EC_4P2GX"
-      - "EC_8P2GX"
+      - "EC_4P3GX"
diff --git a/src/tests/ftest/erasurecode/ior_smoke.yaml b/src/tests/ftest/erasurecode/ior_smoke.yaml
index 2f659d16cf1..17b8ef5b43b 100644
--- a/src/tests/ftest/erasurecode/ior_smoke.yaml
+++ b/src/tests/ftest/erasurecode/ior_smoke.yaml
@@ -61,6 +61,9 @@ ior:
       - "EC_4P2G1"
       - "EC_4P2G8"
       - "EC_4P2GX"
+      - "EC_4P3G1"
+      - "EC_4P3G8"
+      - "EC_4P3GX"
       - "EC_8P2G1"
       - "EC_8P2G8"
       - "EC_8P2GX"
diff --git a/src/tests/ftest/erasurecode/mdtest_smoke.yaml b/src/tests/ftest/erasurecode/mdtest_smoke.yaml
index 6c929689c9d..4e565f3a83b 100644
--- a/src/tests/ftest/erasurecode/mdtest_smoke.yaml
+++ b/src/tests/ftest/erasurecode/mdtest_smoke.yaml
@@ -63,5 +63,7 @@ mdtest:
       - "EC_4P1GX"
       - "EC_4P2G1"
       - "EC_4P2GX"
+      - "EC_4P3G1"
+      - "EC_4P3GX"
       - "EC_8P2G1"
       - "EC_8P2GX"
diff --git a/src/tests/ftest/erasurecode/multiple_rank_failure.yaml b/src/tests/ftest/erasurecode/multiple_rank_failure.yaml
index a90d9369f44..cd0d2e77bb5 100644
--- a/src/tests/ftest/erasurecode/multiple_rank_failure.yaml
+++ b/src/tests/ftest/erasurecode/multiple_rank_failure.yaml
@@ -60,6 +60,9 @@ ior:
     EC_4P2GX:
       dfs_oclass_list:
         - ["EC_4P2GX", 8]
+    EC_4P3GX:
+      dfs_oclass_list:
+        - ["EC_4P3GX", 10]
     EC_8P2GX:
       dfs_oclass_list:
         - ["EC_8P2GX", 10]
diff --git a/src/tests/ftest/erasurecode/multiple_target_failure.yaml b/src/tests/ftest/erasurecode/multiple_target_failure.yaml
index a90d9369f44..cd0d2e77bb5 100644
--- a/src/tests/ftest/erasurecode/multiple_target_failure.yaml
+++ b/src/tests/ftest/erasurecode/multiple_target_failure.yaml
@@ -60,6 +60,9 @@ ior:
     EC_4P2GX:
       dfs_oclass_list:
         - ["EC_4P2GX", 8]
+    EC_4P3GX:
+      dfs_oclass_list:
+        - ["EC_4P3GX", 10]
     EC_8P2GX:
       dfs_oclass_list:
         - ["EC_8P2GX", 10]
diff --git a/src/tests/ftest/erasurecode/offline_rebuild.yaml b/src/tests/ftest/erasurecode/offline_rebuild.yaml
index a61b47760b5..d583887c24f 100644
--- a/src/tests/ftest/erasurecode/offline_rebuild.yaml
+++ b/src/tests/ftest/erasurecode/offline_rebuild.yaml
@@ -56,4 +56,5 @@ ior:
       - ["EC_2P1G1", 6]
       - ["EC_4P1G1", 8]
       - ["EC_4P2G1", 8]
+      - ["EC_4P3G1", 10]
       - ["EC_8P2G1", 12]
diff --git a/src/tests/ftest/erasurecode/online_rebuild.yaml b/src/tests/ftest/erasurecode/online_rebuild.yaml
index 4d34c16049d..74a6eb29ba5 100644
--- a/src/tests/ftest/erasurecode/online_rebuild.yaml
+++ b/src/tests/ftest/erasurecode/online_rebuild.yaml
@@ -62,7 +62,8 @@ ior:
         - [32M, 512M, 2K]
   objectclass:
     dfs_oclass_list:
-      #- [EC_Object_Class, Minimum number of servers]
+      #- [EC_Object_Class, Exact number of servers]
       - ["EC_2P2G1", 6]
       - ["EC_4P2G1", 8]
+      - ["EC_4P3G1", 12]
       - ["EC_8P2G1", 12]
diff --git a/src/tests/ftest/erasurecode/online_rebuild_mdtest.yaml b/src/tests/ftest/erasurecode/online_rebuild_mdtest.yaml
index 3c1ea2f7588..83c2831f4f0 100644
--- a/src/tests/ftest/erasurecode/online_rebuild_mdtest.yaml
+++ b/src/tests/ftest/erasurecode/online_rebuild_mdtest.yaml
@@ -55,7 +55,8 @@ mdtest:
   dfs_dir_oclass: "RP_3G1"
   objectclass:
     dfs_oclass_list:
-      #- [EC_Object_Class, Minimum number of servers]
+      #- [EC_Object_Class, Exact number of servers]
       - ["EC_2P2GX", 6]
       - ["EC_4P2GX", 8]
+      - ["EC_4P3GX", 12]
       - ["EC_8P2GX", 12]
diff --git a/src/tests/ftest/ior/hard.yaml b/src/tests/ftest/ior/hard.yaml
index 5870e4206d5..e04de4c0414 100644
--- a/src/tests/ftest/ior/hard.yaml
+++ b/src/tests/ftest/ior/hard.yaml
@@ -55,6 +55,8 @@ ior:
       dfs_oclass: "EC_2P1GX"
     EC_4P2GX:
       dfs_oclass: "EC_4P2GX"
+    EC_4P3GX:
+      dfs_oclass: "EC_4P3GX"
     EC_8P2GX:
       dfs_oclass: "EC_8P2GX"
   sw_wearout: 1
diff --git a/src/tests/ftest/ior/hard_rebuild.yaml b/src/tests/ftest/ior/hard_rebuild.yaml
index f1a7f28850c..54a89fc237f 100644
--- a/src/tests/ftest/ior/hard_rebuild.yaml
+++ b/src/tests/ftest/ior/hard_rebuild.yaml
@@ -50,9 +50,10 @@ ior:
     - [47008, 47008, 47008]
   objectclass:
     dfs_oclass_list:
-      # - [EC_Object_Class, Minimum number of servers]
+      # - [EC_Object_Class, Exact number of servers]
       - ["EC_2P2GX", 6]
       - ["EC_4P2GX", 8]
+      - ["EC_4P3GX", 12]
       - ["EC_8P2GX", 12]
   sw_wearout: 1
   sw_status_file: stoneWallingStatusFile