X-Git-Url: https://git.adam-barratt.org.uk/?a=blobdiff_plain;f=input%2Fhowto%2Fexport-iscsi.creole;h=6d3b88ff8a3c577e10a7d703cdb49467aea1164c;hb=9061e132d38c354d068878e281c6cf8c536c7bf0;hp=54ce1654b9b8c23e0b9bce8d60e883ba47cea2de;hpb=54bbad1c8c8f65dabfa839296249180131adc62b;p=mirror%2Fdsa-wiki.git

diff --git a/input/howto/export-iscsi.creole b/input/howto/export-iscsi.creole
index 54ce165..6d3b88f 100644
--- a/input/howto/export-iscsi.creole
+++ b/input/howto/export-iscsi.creole
@@ -23,7 +23,7 @@ This document describes how to add new new volumes on gustini and add them into
     iscsiadm -m node --targetname "iqn.1986-03.com.hp:storage.msa2012i.0834d5ecda.a" --rescan
 
   + on dijkstra: add aliases to the wwids (show topology)
-  + on dijkstra: /etc/init.d/multipath-tools reload
+  + on dijkstra: service multipath-tools reload
 }}}
 
 == via telnet interface ==
@@ -37,4 +37,64 @@ This document describes how to add new new volumes on gustini and add them into
 * map the new volume to traetta.debian.org, LUN 12
   + map volume berlioz-boot lun 12 host traetta access rw
   (again, there is a 'help map volume' command with lots of informations)
+
+* Run 'show host-maps $host' again, then, on the host, run:
+	convert_sn() {
+	  local sn a b c d
+	  sn="$1"
+	  a="${sn%??????????????????????????}"; sn="${sn#??????}"
+	  b="${sn%????????????????????}"; sn="${sn#??????}"
+	  c="${sn%??????????????}"; sn="${sn#??????}"
+	  d="$sn"
+
+	  if [ "${c#0000}" = "$c" ]; then
+	    echo >&2 "sn has unexpected value ($1: $a - $b - $c - $d)"
+	    return 1
+	  fi
+
+	  echo "36${a}000${b}${c#0000}${d}"
+	  return 0
+	}
+
+	parse_volume() {
+	  host=`hostname`
+	  echo "Paste appropriate 'show host-maps $host' output line:"
+	  read name sn id lun access channels
+
+	  if [ "$access" != "rw" ]; then
+	    echo >&2 "Do not have rw access"
+	    return 1
+	  fi
+
+	  if [ "$(echo -n "$sn" | wc -c)" != "32" ]; then
+	    echo >&2 "Unexpected sn length in '$sn' (wanted 32 chars)"
+	    return 1
+	  fi
+
+	  wwid=$(convert_sn "$sn")
+
+	  if [ -z "$wwid" ]; then
+	    return 1
+	  fi
+
+	  echo ""
+	  echo "  multipath {"
+	  echo "    wwid $wwid"
+	  echo "    alias $name"
+	  echo "  }"
+	  echo ""
+
+	  mp="$(multipath -ll $wwid)"
+	  if [ -z "$mp" ]; then
+	    echo >&2 "Warning: multipath does not know about $wwid"
+	    return 1
+	  fi
+
+	  if ! echo "$mp" | grep -q ":$lun "; then
+	    echo >&2 "Warning: Are you sure $wwid is lun $lun?  multipath -ll disagrees"
+	    return 1
+	  fi
+	}
+
+	parse_volume
 }}}