document removal of luns

[mirror/dsa-wiki.git] / input / howto / install-ganeti.creole

diff --git a/input/howto/install-ganeti.creole b/input/howto/install-ganeti.creole
index e27f02b..e5da4d9 100644 (file)
--- a/input/howto/install-ganeti.creole
+++ b/input/howto/install-ganeti.creole
@@ -183,6 +183,13 @@ on the master node (foo):
       bar.debian.org
 }}}
 
+more stuff:
+
+{{{
+  gnt-cluster modify --reserved-lvs='vg0/local-swap.*'
+  maybe: gnt-cluster modify --nic-parameters mode=openvswitch
+}}}
+
 Note the following:
 
 * the secondary IP address is set to the value of the slave node's interface on the private network
@@ -197,9 +204,9 @@ On the master node (foo):
 
 If everything has been configured correctly, no errors should be reported.
 
-=== create the 'dsa' variant ===
+=== create the 'noop' variant ===
 
-Ensure that the debootstrap+dsa variant has been installed by puppet (see ganeti2 module in dsa-puppet).
+Ensure that the ganeti-os-noop is installed.
 
 ----
 
@@ -368,17 +375,19 @@ And you want to convert it to use DRBD afterwards and start it on the other clus
   Choose which vdisk to use, use "show vdisks" to list
 
 Add the volume:
-  # create volume vdisk msa2k-2-500gr10 size 5G donizetti      
+  # create volume vdisk msa2k-2-500gr10 size 5G donizetti
 
 Find a free LUN:
 
   # show lun-maps
+  or (if we assume they are all the same)
+  # show host-maps 3001438001287090
 
 Make a note of the next free LUN
 
 Generate map commands for all blades, all ports, run locally:
 
-  $ for p in 1 2 3 4; do for bl in 1 2 3 4 5 6 ; do echo "map volume donizetti lun 27 host bm-bl$bl-p$p" ; done ; done
+  $ for bl in 1 2 3 4 5 6 ; do for p in 1 2 3 4; do echo "map volume donizetti lun 27 host bm-bl$bl-p$p" ; done ; done
 
 Paste the output into the MSA shell
 
@@ -403,3 +412,58 @@ echo "$WWN" | sed -re 's#(.{6})(.{6})0000(.{2})(.*)#36\1000\2\3\4#'
 
   This will update the multipath config on all cluster nodes. WITHOUT doing this, you can't migrate VMs between nodes.
 }}}
+
+** Remove LUNs.
+
+Order is important, or else things get very, very confused and the world needs a reboot.
+
+*** Make sure nothing uses the volume anymore.
+
+*** Make sure we do not have any partitions lying around for it:
+{{{
+  gnt-cluster command "ls -l /dev/mapper/backuphost*"
+  # and maybe:
+  gnt-cluster command "kpartx -v -p -part -d /dev/mapper/backuphost"
+}}}
+
+*** flush the device, remove the multipath mapping, flush all backing devices:
+{{{
+  root@bm-bl1:~# cat flush-mp-device 
+  #!/bin/sh
+
+  dev="$1"
+
+  if [ -z "$dev" ] || ! [ -e "$dev" ]; then
+    echo 2>&1 "Device $dev does not exist."
+    exit 1
+  fi
+
+  devs=$(multipath -ll "$dev" | grep cciss | sed -e 's/.*cciss!//; s/ .*//;')
+
+  if [ -z "$devs" ]; then
+    echo 2>&1 "No backends found for $dev."
+    exit 1
+  fi
+
+  set -e
+
+  blockdev --flushbufs "$dev"
+  multipath -f "$dev"
+  for d in $devs; do
+    blockdev --flushbufs "/dev/cciss/$d"
+  done
+  echo done.
+}}}
+{{{
+  gnt-cluster command "/root/flush-mp-device /dev/mapper/backuphost"
+}}}
+
+*** Immediately afterwards, paste the output of the following to the MSA console.  Best prepare this before, so you do it quickly before anything else rescans stuff, reloads or restarts multipathd, and the devices become used again.
+{{{
+  for bl in 1 2 3 4 5 6 ; do for p in 1 2 3 4; do echo "unmap volume DECOMMISSION-backuph host bm-bl$bl-p$p" ; done ; done
+}}}
+
+*** Lastly, rescan the scsi bus on all hosts.  Do not forget that.  hpacucli and the monitoring tools might lock up the machine if they try to check the status of a device that now no longer exists but that the system still thinkgs is around.
+{{{
+  gnt-cluster command "echo 1 > /sys/bus/pci/devices/0000:0e:00.0/cciss0/rescan"
+}}}