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 -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). 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 ---- To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1277316/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
