Index: trunk/packages/xvm-iscsi-config/debian/changelog
===================================================================
--- trunk/packages/xvm-iscsi-config/debian/changelog	(revision 1922)
+++ trunk/packages/xvm-iscsi-config/debian/changelog	(revision 1923)
@@ -1,2 +1,8 @@
+xvm-iscsi-config (0.0.4) unstable; urgency=low
+
+  * don't restart iscsi on upgrade, only first install
+
+ -- Greg Price <price@mit.edu>  Sun, 28 Dec 2008 00:24:41 -0500
+
 xvm-iscsi-config (0.0.3) unstable; urgency=low
 
Index: trunk/packages/xvm-iscsi-config/debian/xvm-iscsi-config.postinst
===================================================================
--- trunk/packages/xvm-iscsi-config/debian/xvm-iscsi-config.postinst	(revision 1922)
+++ trunk/packages/xvm-iscsi-config/debian/xvm-iscsi-config.postinst	(revision 1923)
@@ -42,7 +42,20 @@
  password: $PASSWORD
 EOF
-        invoke-rc.d xvm-iscsi-config restart
-        invoke-rc.d open-iscsi restart
-        iscsiadm -m discovery -t st -p $(invirt-getconf iscsi.address):3260
+        if [ -z "$2" ]; then
+            invoke-rc.d xvm-iscsi-config restart
+            invoke-rc.d open-iscsi restart
+            iscsiadm -m discovery -t st -p $(invirt-getconf iscsi.address):3260
+        else
+            # Don't disrupt an existing installation.
+            cat <<EOF
+xvm-iscsi-config: If the configuration has changed, restart iscsi:
+  /etc/init.d/xvm-iscsi-config restart
+  /etc/init.d/open-iscsi restart
+  iscsiadm -m discovery -t st -p $(invirt-getconf iscsi.address):3260
+  lvchange -a ln /dev/xenvg && lvchange -a y /dev/xenvg
+This will leave VMs unable to access their disks, so migrate them first.
+
+EOF
+        fi
     ;;