diff --git a/examples/zfs-generic-iscsi.yaml b/examples/zfs-generic-iscsi.yaml
index 2aaf5d0..af5df37 100644
--- a/examples/zfs-generic-iscsi.yaml
+++ b/examples/zfs-generic-iscsi.yaml
@@ -70,7 +70,11 @@ iscsi:
         #password: "bar"
         # mutual CHAP
         #mutual_userid: "baz"
-        #mutual_password: "bar"  
+        #mutual_password: "bar"
+    block:
+      attributes:
+        # set to 1 to enable Thin Provisioning Unmap
+        emulate_tpu: 0
   targetPortal: "server[:port]"
   # for multipath
   targetPortals: [] # [ "server[:port]", "server[:port]", ... ]
diff --git a/src/driver/controller-zfs-generic/index.js b/src/driver/controller-zfs-generic/index.js
index 6ba5b0b..d3080ae 100644
--- a/src/driver/controller-zfs-generic/index.js
+++ b/src/driver/controller-zfs-generic/index.js
@@ -219,6 +219,22 @@ class ControllerZfsGenericDriver extends ControllerZfsBaseDriver {
             basename = this.options.iscsi.shareStrategyTargetCli.basename;
             let setAttributesText = "";
             let setAuthText = "";
+            let setBlockAttributesText = "";
+
+            if (this.options.iscsi.shareStrategyTargetCli.block) {
+              if (this.options.iscsi.shareStrategyTargetCli.block.attributes) {
+                for (const attributeName in this.options.iscsi
+                  .shareStrategyTargetCli.block.attributes) {
+                  const attributeValue =
+                    this.options.iscsi.shareStrategyTargetCli.block.attributes[
+                      attributeName
+                    ];
+                  setBlockAttributesText += "\n";
+                  setBlockAttributesText += `set attribute ${attributeName}=${attributeValue}`;
+                }
+              }
+            }
+
             if (this.options.iscsi.shareStrategyTargetCli.tpg) {
               if (this.options.iscsi.shareStrategyTargetCli.tpg.attributes) {
                 for (const attributeName in this.options.iscsi
@@ -263,6 +279,8 @@ ${setAuthText}
 # create extent
 cd /backstores/block
 create ${assetName} /dev/${extentDiskName}
+cd /backstores/block/${assetName}
+${setBlockAttributesText}
 
 # add extent to target/tpg
 cd /iscsi/${basename}:${assetName}/tpg1/luns