diff --git a/block/qapi.c b/block/qapi.c
index 5ba10f4..f98ff64 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -258,6 +258,9 @@ void bdrv_query_info(BlockDriverState *bs,
                 cfg.buckets[THROTTLE_OPS_WRITE].max;
             info->inserted->iops_wr_max     =
                 cfg.buckets[THROTTLE_OPS_WRITE].max;
+
+            info->inserted->has_iops_sector_count = cfg.op_size;
+            info->inserted->iops_sector_count = cfg.op_size;
         }
 
         bs0 = bs;
diff --git a/blockdev.c b/blockdev.c
index 22016a2..e2b0ee0 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -500,7 +500,7 @@ static DriveInfo *blockdev_init(QemuOpts *all_opts,
         qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
 
     cfg.unit_size = BDRV_SECTOR_SIZE;
-    cfg.op_size = 0;
+    cfg.op_size = qemu_opt_get_number(opts, "throttling.iops-sector-count", 0);
 
     if (!check_throttle_config(&cfg, &error)) {
         error_report("%s", error_get_pretty(error));
@@ -786,6 +786,9 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
     qemu_opt_rename(all_opts, "bps_rd_max", "throttling.bps-read-max");
     qemu_opt_rename(all_opts, "bps_wr_max", "throttling.bps-write-max");
 
+    qemu_opt_rename(all_opts,
+                    "iops_sector_count", "throttling.iops-sector-count");
+
     qemu_opt_rename(all_opts, "readonly", "read-only");
 
     value = qemu_opt_get(all_opts, "cache");
@@ -1285,7 +1288,9 @@ void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
                                bool has_iops_rd_max,
                                int64_t iops_rd_max,
                                bool has_iops_wr_max,
-                               int64_t iops_wr_max, Error **errp)
+                               int64_t iops_wr_max,
+                               bool has_iops_sector_count,
+                               int64_t iops_sector_count, Error **errp)
 {
     ThrottleConfig cfg;
     BlockDriverState *bs;
@@ -1325,7 +1330,10 @@ void qmp_block_set_io_throttle(const char *device, int64_t bps, int64_t bps_rd,
     }
 
     cfg.unit_size = BDRV_SECTOR_SIZE;
-    cfg.op_size = 0;
+
+    if (has_iops_sector_count) {
+        cfg.op_size = iops_sector_count;
+    }
 
     if (!check_throttle_config(&cfg, errp)) {
         return;
@@ -2051,6 +2059,10 @@ QemuOptsList qemu_common_drive_opts = {
             .type = QEMU_OPT_NUMBER,
             .help = "total bytes write burst",
         },{
+            .name = "throttling.iops-sector-count",
+            .type = QEMU_OPT_NUMBER,
+            .help = "when limiting by iops max size of an I/O in sector",
+        },{
             .name = "copy-on-read",
             .type = QEMU_OPT_BOOL,
             .help = "copy read data from backing file into image file",
@@ -2197,6 +2209,10 @@ QemuOptsList qemu_old_drive_opts = {
             .type = QEMU_OPT_NUMBER,
             .help = "total bytes write burst",
         },{
+            .name = "iops_sector_count",
+            .type = QEMU_OPT_NUMBER,
+            .help = "when limiting by iops max size of an I/O in sector",
+        },{
             .name = "copy-on-read",
             .type = QEMU_OPT_BOOL,
             .help = "copy read data from backing file into image file",
diff --git a/hmp.c b/hmp.c
index e0c387c..01f7685 100644
--- a/hmp.c
+++ b/hmp.c
@@ -351,7 +351,8 @@ void hmp_info_block(Monitor *mon, const QDict *qdict)
                             " iops_wr=%" PRId64
                             " iops_max=%" PRId64
                             " iops_rd_max=%" PRId64
-                            " iops_wr_max=%" PRId64 "\n",
+                            " iops_wr_max=%" PRId64
+                            " iops_sector_count=%" PRId64 "\n",
                             info->value->inserted->bps,
                             info->value->inserted->bps_rd,
                             info->value->inserted->bps_wr,
@@ -363,7 +364,8 @@ void hmp_info_block(Monitor *mon, const QDict *qdict)
                             info->value->inserted->iops_wr,
                             info->value->inserted->iops_max,
                             info->value->inserted->iops_rd_max,
-                            info->value->inserted->iops_wr_max);
+                            info->value->inserted->iops_wr_max,
+                            info->value->inserted->iops_sector_count);
         } else {
             monitor_printf(mon, " [not inserted]");
         }
@@ -1124,6 +1126,8 @@ void hmp_block_set_io_throttle(Monitor *mon, const QDict *qdict)
                               false,
                               0,
                               false,
+                              0,
+                              false, /* No default I/O size */
                               0, &err);
     hmp_handle_error(mon, &err);
 }
diff --git a/qapi-schema.json b/qapi-schema.json
index 5e5461e..c7b1d5e 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -797,6 +797,8 @@
 #
 # @iops_wr_max: #optional write I/O operations max (Since 1.7)
 #
+# @iops_sector_count: #optional an I/O size in sector (Since 1.6)
+#
 # Since: 0.14.0
 #
 # Notes: This interface is only found in @BlockInfo.
@@ -810,7 +812,8 @@
             'image': 'ImageInfo',
             '*bps_max': 'int', '*bps_rd_max': 'int',
             '*bps_wr_max': 'int', '*iops_max': 'int',
-            '*iops_rd_max': 'int', '*iops_wr_max': 'int' }}
+            '*iops_rd_max': 'int', '*iops_wr_max': 'int',
+            '*iops_sector_count': 'int' } }
 
 ##
 # @BlockDeviceIoStatus:
@@ -2201,6 +2204,8 @@
 #
 # @iops_wr_max: #optional write I/O operations max (Since 1.7)
 #
+# @iops_sector_count: #optional an I/O size in sector (Since 1.6)
+#
 # Returns: Nothing on success
 #          If @device is not a valid block device, DeviceNotFound
 #
@@ -2211,7 +2216,8 @@
             'iops': 'int', 'iops_rd': 'int', 'iops_wr': 'int',
             '*bps_max': 'int', '*bps_rd_max': 'int',
             '*bps_wr_max': 'int', '*iops_max': 'int',
-            '*iops_rd_max': 'int', '*iops_wr_max': 'int' }}
+            '*iops_rd_max': 'int', '*iops_wr_max': 'int',
+            '*iops_sector_count': 'int' }}
 
 ##
 # @block-stream:
diff --git a/qemu-options.hx b/qemu-options.hx
index 3aa8f9e..c539dd0 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -411,7 +411,7 @@ DEF("drive", HAS_ARG, QEMU_OPTION_drive,
     "       [,readonly=on|off][,copy-on-read=on|off]\n"
     "       [[,bps=b]|[[,bps_rd=r][,bps_wr=w]]][[,iops=i]|[[,iops_rd=r]"
     "        [,iops_wr=w][,bps_max=bt]|[[,bps_rd_max=rt][,bps_wr_max=wt]]]"
-    "       [[,iops_max=it]|[[,iops_rd_max=rt][,iops_wr_max=wt]]\n"
+    "       [[,iops_max=it]|[[,iops_rd_max=rt][,iops_wr_max=wt][,iops_sector_count=cnt]]\n"
     "                use 'file' as a drive image\n", QEMU_ARCH_ALL)
 STEXI
 @item -drive @var{option}[,@var{option}[,@var{option}[,...]]]
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 1610831..bcd255f 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1389,7 +1389,7 @@ EQMP
 
     {
         .name       = "block_set_io_throttle",
-        .args_type  = "device:B,bps:l,bps_rd:l,bps_wr:l,iops:l,iops_rd:l,iops_wr:l,bps_max:l?,bps_rd_max:l?,bps_wr_max:l?,iops_max:l?,iops_rd_max:l?,iops_wr_max:l?",
+        .args_type  = "device:B,bps:l,bps_rd:l,bps_wr:l,iops:l,iops_rd:l,iops_wr:l,bps_max:l?,bps_rd_max:l?,bps_wr_max:l?,iops_max:l?,iops_rd_max:l?,iops_wr_max:l?,iops_sector_count:l?",
         .mhandler.cmd_new = qmp_marshal_input_block_set_io_throttle,
     },
 
@@ -1414,6 +1414,7 @@ Arguments:
 - "iops_max":  total I/O operations max(json-int)
 - "iops_rd_max":  read I/O operations max(json-int)
 - "iops_wr_max":  write I/O operations max(json-int)
+- "iops_sector_count":  I/O sector count when limiting(json-int)
 
 Example:
 
@@ -1429,7 +1430,8 @@ Example:
                                                "bps_wr_max": "0",
                                                "iops_max": "0",
                                                "iops_rd_max": "0",
-                                               "iops_wr_max": "0" } }
+                                               "iops_wr_max": "0",
+                                               "iops_sector_count": "0" } }
 <- { "return": {} }
 
 EQMP
@@ -1776,6 +1778,7 @@ Each json-object contain the following:
          - "iops_max":  total I/O operations max(json-int)
          - "iops_rd_max":  read I/O operations max(json-int)
          - "iops_wr_max":  write I/O operations max(json-int)
+         - "iops_sector_count":  I/O sector count when limiting(json-int)
          - "image": the detail of the image, it is a json-object containing
             the following:
              - "filename": image file name (json-string)
@@ -1851,6 +1854,7 @@ Example:
                "iops_max": "0",
                "iops_rd_max": "0",
                "iops_wr_max": "0",
+               "iops_sector_count": "0",
                "image":{
                   "filename":"disks/test.qcow2",
                   "format":"qcow2",
