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[Matt Riedemann <mriedem@xxxxxxxxxx>]

*** This bug is a duplicate of bug 1456480 ***
    https://bugs.launchpad.net/bugs/1456480

** Tags added: multipath

** This bug has been marked a duplicate of bug 1456480
   Performance issue during volume detachment in ISCSIConnector when iSCSI multipath is used

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

Title:
  Disconnecting a volume with multipath generates excessive multipath
  calls

Status in OpenStack Compute (nova):
  In Progress

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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