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[Sam Morrison <1277316@xxxxxxxxxxxxxxxxxx>]

This is due to inefficient code in nova.virt.libvirt.volume

The massive amount of multipath calls is from the code to figure out other IQNs attached to the compute node. 
There is basically a nested for loop, this code can be changed to make it more efficient.


** Project changed: cinder => nova

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https://bugs.launchpad.net/bugs/1277316

Title:
  Diconnecting a volume with multipath generates excesive multipath
  calls

Status in OpenStack Compute (Nova):
  New

Bug description:
  I have a compute node with 20 volumes attached using iscsi and multipath.
  Each multipath device has 4 iscsi devices.

  When I disconnect a volume it generates 779 multipath -ll calls.

  
  iscsiadm -m node --rescan
  iscsiadm -m session --rescan
  multipath - r

  multipath -ll /dev/sdch
  multipath -ll /dev/sdcg
  multipath -ll /dev/sdcf
  multipath -ll /dev/sdce
  multipath -ll /dev/sdcd
  multipath -ll /dev/sdcc
  multipath -ll /dev/sdcb
  multipath -ll /dev/sdca
  multipath -ll /dev/sdbz
  multipath -ll /dev/sdby
  multipath -ll /dev/sdbx
  multipath -ll /dev/sdbw
  multipath -ll /dev/sdbv
  multipath -ll /dev/sdbu
  multipath -ll /dev/sdbt
  multipath -ll /dev/sdbs
  multipath -ll /dev/sdbr
  multipath -ll /dev/sdbq
  multipath -ll /dev/sdbp
  multipath -ll /dev/sdbo
  multipath -ll /dev/sdbn
  multipath -ll /dev/sdbm
  multipath -ll /dev/sdbl
  multipath -ll /dev/sdbk
  multipath -ll /dev/sdbj
  multipath -ll /dev/sdbi
  multipath -ll /dev/sdbh
  multipath -ll /dev/sdbg
  multipath -ll /dev/sdbf
  multipath -ll /dev/sdbe
  multipath -ll /dev/sdbd
  multipath -ll /dev/sdbc
  multipath -ll /dev/sdbb
  multipath -ll /dev/sdba
  ----
  ...... And so on for 779 times
  cp /dev/stdin /sys/block/sdcd/device/delete
  cp /dev/stdin /sys/block/sdcc/device/delete
  cp /dev/stdin /sys/block/sdcb/device/delete
  cp /dev/stdin /sys/block/sdca/device/delete
  multipath - r

  
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