diff --git a/compute/src/main/java/org/zstack/compute/host/HostBase.java b/compute/src/main/java/org/zstack/compute/host/HostBase.java
index 919d92631fc..3787541a39d 100755
--- a/compute/src/main/java/org/zstack/compute/host/HostBase.java
+++ b/compute/src/main/java/org/zstack/compute/host/HostBase.java
@@ -955,7 +955,7 @@ private void handle(final PingHostMsg msg) {
         thdf.chainSubmit(new ChainTask(msg) {
             @Override
             public String getSyncSignature() {
-                return "do-ping-host";
+                return String.format("do-ping-host-%s", msg.getHostUuid());
             }
 
             @Override
@@ -979,13 +979,9 @@ public void fail(ErrorCode errorCode) {
 
             @Override
             public String getName() {
-                return String.format("do-ping-host-%s", msg.getHostUuid());
+                return getSyncSignature();
             }
 
-            @Override
-            protected int getSyncLevel() {
-                return HostGlobalConfig.HOST_TRACK_PARALLELISM_DEGREE.value(Integer.class);
-            }
         });
     }
 
diff --git a/conf/globalConfig/host.xml b/conf/globalConfig/host.xml
index ac15a50e580..c31bcbdb7e7 100755
--- a/conf/globalConfig/host.xml
+++ b/conf/globalConfig/host.xml
@@ -24,7 +24,7 @@
     <config>
         <category>host</category>
         <name>ping.parallelismDegree</name>
-        <description>The max hosts management server sends ping command to host in parallel</description>
+        <description>The max hosts management server sends ping command to host in parallel. With per-host sync signature, this now controls per-host parallelism (one host does not block another).</description>
         <defaultValue>100</defaultValue>
         <type>java.lang.Integer</type>
     </config>
diff --git a/test/src/test/groovy/org/zstack/test/integration/kvm/host/KVMPingCase.groovy b/test/src/test/groovy/org/zstack/test/integration/kvm/host/KVMPingCase.groovy
index 1709790ab08..3fb55ec2b00 100755
--- a/test/src/test/groovy/org/zstack/test/integration/kvm/host/KVMPingCase.groovy
+++ b/test/src/test/groovy/org/zstack/test/integration/kvm/host/KVMPingCase.groovy
@@ -24,6 +24,7 @@ import org.zstack.testlib.SubCase
 import org.zstack.utils.FieldUtils
 import org.zstack.utils.gson.JSONObjectUtil
 
+import java.util.concurrent.CountDownLatch
 import java.util.concurrent.TimeUnit
 
 class KVMPingCase extends SubCase {
@@ -460,6 +461,50 @@ class KVMPingCase extends SubCase {
         }
     }
 
+    void testDifferentHostPingsNotBlocked() {
+        canDoReconnectFunc = { HostReconnectTask.CanDoAnswer.Ready }
+
+        HostInventory kvm1 = env.inventoryByName("kvm1")
+        HostInventory kvm2 = env.inventoryByName("kvm2")
+
+        waitHostConnected(kvm1.uuid)
+        waitHostConnected(kvm2.uuid)
+
+        // Set parallelism to 1 so the test proves per-host isolation:
+        // old code (shared do-ping-host + level=1) → kvm2 blocked by kvm1
+        // new code (per-host do-ping-host-<uuid> + level=1) → kvm2 unblocked
+        HostGlobalConfig.HOST_TRACK_PARALLELISM_DEGREE.updateValue(1)
+
+        CountDownLatch blockKvm1 = new CountDownLatch(1)
+        CountDownLatch kvm2Pinged = new CountDownLatch(1)
+
+        env.simulator(KVMConstant.KVM_PING_PATH) { HttpEntity<String> e, EnvSpec espec ->
+            KVMAgentCommands.PingCmd cmd = JSONObjectUtil.toObject(e.getBody(), KVMAgentCommands.PingCmd.class)
+            def rsp = new KVMAgentCommands.PingResponse()
+
+            if (cmd.hostUuid == kvm1.uuid) {
+                blockKvm1.await(30, TimeUnit.SECONDS)
+            }
+
+            if (cmd.hostUuid == kvm2.uuid) {
+                kvm2Pinged.countDown()
+            }
+
+            rsp.hostUuid = cmd.hostUuid
+            return rsp
+        }
+
+        try {
+            assert kvm2Pinged.await(30, TimeUnit.SECONDS)
+        } finally {
+            blockKvm1.countDown()
+            env.cleanSimulatorHandlers()
+            HostGlobalConfig.HOST_TRACK_PARALLELISM_DEGREE.updateValue(100)
+            recoverHostToConnected(kvm1.uuid)
+            recoverHostToConnected(kvm2.uuid)
+        }
+    }
+
     @Override
     void test() {
         bus = bean(CloudBus.class)
@@ -490,6 +535,7 @@ class KVMPingCase extends SubCase {
             testHostReconnectAfterPingFailure()
             testContinuePingIfHostNoReconnect()
             testNoPingIfHostNotReadyToReconnect()
+            testDifferentHostPingsNotBlocked()
             testManagementNodeReadyConnectAllHost()
             testPingConnectingHost()