Added test_linstor_sr_pool_update for rolling pool update with VM availability check.

It performs
- An update of all hosts in a LINSTOR SR pool (starting with the master)
- Reboots updated hosts
- Verifies VM can start and shutdown successfully on each host after update
- Ensures SR remains usable throughout the process

Signed-off-by: Rushikesh Jadhav <[email protected]>

Author: rushikeshjadhav

tests/storage/linstor/test_linstor_sr.py

@@ -131,6 +131,47 @@ def test_linstor_missing(self, linstor_sr, host):
             if not linstor_installed:
                 host.yum_install([LINSTOR_PACKAGE])
 
+    @pytest.mark.reboot
+    @pytest.mark.small_vm
+    def test_linstor_sr_pool_update(self, linstor_sr, vm_on_linstor_sr):
+        """
+        Perform update on the Linstor SR pool hosts while ensuring VM availability.
+        1. Identify all hosts in the SR pool and order them with the master first.
+        2. Sequentially update each host.
+        3. Sequentially reboot each host.
+        4. Ensure that the VM can start on all hosts.
+        """
+
+        sr = linstor_sr
+        vm = vm_on_linstor_sr
+        updates_applied = []
+
+        # Sort hosts so that pool master is first
+        hosts = sorted(sr.pool.hosts, key=lambda h: h != sr.pool.master)
+
+        # RPU is disabled for pools with XOSTOR SRs.
+        # LINSTOR expects that we always use satellites and controllers with the same version on all hosts.
+
+        for h in hosts:
+            logging.info("Checking on host %s", h.hostname_or_ip)
+            if h.has_updates():
+                h.install_updates()
+                updates_applied.append(h)
+            else:
+                logging.info("No updates available for host %s", h.hostname_or_ip)
+
+        # Reboot updated hosts
+        for h in updates_applied:
+            h.reboot(verify=True)
+
+        # Ensure VM is able to boot on all the hosts
+        for h in hosts:
+            vm.start(on=h.uuid)
+            vm.wait_for_os_booted()
+            vm.shutdown(verify=True)
+
+        sr.scan()
+
     # *** End of tests with reboots
 
 # --- Test diskless resources --------------------------------------------------