Index: head/cddl/usr.sbin/zfsd/case_file.h
===================================================================
--- head/cddl/usr.sbin/zfsd/case_file.h
+++ head/cddl/usr.sbin/zfsd/case_file.h
@@ -89,6 +89,8 @@
 	 * \brief Find a CaseFile object by a vdev's pool/vdev GUID tuple.
 	 *
 	 * \param poolGUID  Pool GUID for the vdev of the CaseFile to find.
+	 * 		    If InvalidGuid, then only match the vdev GUID
+	 * 		    instead of both pool and vdev GUIDs.
 	 * \param vdevGUID  Vdev GUID for the vdev of the CaseFile to find.
 	 *
 	 * \return  If found, a pointer to a valid CaseFile object.
Index: head/cddl/usr.sbin/zfsd/case_file.cc
===================================================================
--- head/cddl/usr.sbin/zfsd/case_file.cc
+++ head/cddl/usr.sbin/zfsd/case_file.cc
@@ -102,7 +102,8 @@
 	for (CaseFileList::iterator curCase = s_activeCases.begin();
 	     curCase != s_activeCases.end(); curCase++) {
 
-		if ((*curCase)->PoolGUID() != poolGUID
+		if (((*curCase)->PoolGUID() != poolGUID
+		  && Guid::InvalidGuid() != poolGUID)
 		 || (*curCase)->VdevGUID() != vdevGUID)
 			continue;
 
@@ -268,7 +269,8 @@
 	}
 
 	if (vdev != NULL
-	 && vdev->PoolGUID() == m_poolGUID
+	 && ( vdev->PoolGUID() == m_poolGUID
+	   || vdev->PoolGUID() == Guid::InvalidGuid())
 	 && vdev->GUID() == m_vdevGUID) {
 
 		zpool_vdev_online(pool, vdev->GUIDString().c_str(),
Index: head/cddl/usr.sbin/zfsd/vdev_iterator.cc
===================================================================
--- head/cddl/usr.sbin/zfsd/vdev_iterator.cc
+++ head/cddl/usr.sbin/zfsd/vdev_iterator.cc
@@ -76,7 +76,9 @@
 VdevIterator::Reset()
 {
 	nvlist_t  *rootVdev;
+	nvlist	  **cache_child;
 	int	   result;
+	uint_t   cache_children;
 
 	result = nvlist_lookup_nvlist(m_poolConfig,
 				      ZPOOL_CONFIG_VDEV_TREE,
@@ -85,6 +87,13 @@
 		throw ZfsdException(m_poolConfig, "Unable to extract "
 				    "ZPOOL_CONFIG_VDEV_TREE from pool.");
 	m_vdevQueue.assign(1, rootVdev);
+	result = nvlist_lookup_nvlist_array(rootVdev,
+				      	    ZPOOL_CONFIG_L2CACHE,
+				      	    &cache_child,
+					    &cache_children);
+	if (result == 0)
+		for (uint_t c = 0; c < cache_children; c++)
+			m_vdevQueue.push_back(cache_child[c]);
 }
 
 nvlist_t *
Index: head/lib/libdevdctl/guid.h
===================================================================
--- head/lib/libdevdctl/guid.h
+++ head/lib/libdevdctl/guid.h
@@ -62,9 +62,9 @@
 {
 public:
 	/* Constructors */
-	Guid();
 	Guid(uint64_t guid);
 	Guid(const std::string &guid);
+	static Guid InvalidGuid();
 
 	/* Assignment */
 	Guid& operator=(const Guid& rhs);
@@ -80,23 +80,24 @@
 	operator uint64_t()		 const;
 	operator bool()			 const;
 
-	static const uint64_t INVALID_GUID = 0;
 protected:
+	static const uint64_t INVALID_GUID = 0;
+
 	/* The integer value of the GUID. */
 	uint64_t  m_GUID;
 };
 
 //- Guid Inline Public Methods ------------------------------------------------
 inline
-Guid::Guid()
-  : m_GUID(INVALID_GUID)
+Guid::Guid(uint64_t guid)
+  : m_GUID(guid)
 {
 }
 
-inline
-Guid::Guid(uint64_t guid)
-  : m_GUID(guid)
+inline Guid
+Guid::InvalidGuid()
 {
+	return (Guid(INVALID_GUID));
 }
 
 inline Guid&