Public bug reported:
When attaching/detaching volumes, due to operation failures because of
infrastructure problems like network outage, we are left with a situation where
Cinder unmaps the volume from the compute host but we there are still leftover
devices on the compute host.
These device cause issues for further attachment/detachment and even during
scanning.
If there are leftover devices with target numbers (h:c:T:l) that are not
relevant to the current connections, we keep using the same targets for
scanning new devices and fail with device not found.
These entries are left in the /sys/class/fc_transport path from where os-brick
fetches the channel and target values for scanning.
It would be ideal to have efforts minimizing this situation that when a
volume/LUN is unmapped to the compute node, we should have a mechanism
that check these conditions and cleans up the leftover devices.
** Affects: nova
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2077455
Title:
leftover devices causes issues while scanning new devices
Status in OpenStack Compute (nova):
New
Bug description:
When attaching/detaching volumes, due to operation failures because of
infrastructure problems like network outage, we are left with a situation where
Cinder unmaps the volume from the compute host but we there are still leftover
devices on the compute host.
These device cause issues for further attachment/detachment and even during
scanning.
If there are leftover devices with target numbers (h:c:T:l) that are not
relevant to the current connections, we keep using the same targets for
scanning new devices and fail with device not found.
These entries are left in the /sys/class/fc_transport path from where
os-brick fetches the channel and target values for scanning.
It would be ideal to have efforts minimizing this situation that when
a volume/LUN is unmapped to the compute node, we should have a
mechanism that check these conditions and cleans up the leftover
devices.
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https://bugs.launchpad.net/nova/+bug/2077455/+subscriptions
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