Answer by walter-boring for I have a block storage configured using Cinder (on Juno). A new volume was created and its state shows as "available". I have a nova instance (a test Cirros instance) configured. I want to attach this existing cinder volume to the nova instance. After trying nova volume-attach "instance ID" "volume ID" "/dev/vdb" OR nova volume-attach "instance ID" "volume ID" "auto" , the state of the volume changes from "attaching" and then back to "available" and the "attached to" field is blank. Nothing on 'fdisk -l' on the cirros instance. This cirros is running on a KVM (on a virtual machine) - and this virtual machine is running on VMware Esxi. So, this is sort of a nested virtualization. OUTPUT of lvs and vgs on RHEL65. [root@rhel65-03 nova]# lvs LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert lv_root vg_rhel6501 -wi-ao---- 44.65g lv_swap vg_rhel6501 -wi-ao---- 4.86g [root@rhel65-03 nova]# vgs VG #PV #LV #SN Attr VSize VFree cinder-volumes 1 0 0 wz--n- 40.00g 40.00g vg_rhel6501 1 2 0 wz--n- 49.51g 0 [root@rhel65-03 nova]# vgchange -a y cinder-volumes 0 logical volume(s) in volume group "cinder-volumes" now active Boot from Image(Create Volume) Error in volume.log 2015-02-04 14:12:20.961 21245 ERROR cinder.volume.drivers.ibm.storwize_svc.helpers [req-a9780d29-e87f-46af-9f28-7f27a55c7b17 2c37f6bd55b8402bae2ab04402562e4f 4cf6d19846284f4bb5cb3731395de51b - - -] create_host: No initiators or wwpns supplied. 2015-02-04 14:12:20.962 21245 ERROR cinder.volume.driver [req-a9780d29-e87f-46af-9f28-7f27a55c7b17 2c37f6bd55b8402bae2ab04402562e4f 4cf6d19846284f4bb5cb3731395de51b - - -] Unable to fetch connection information from backend: create_host: No initiators or wwpns supplied. 2015-02-04 14:12:20.964 21245 ERROR cinder.volume.flows.manager.create_volume [req-a9780d29-e87f-46af-9f28-7f27a55c7b17 2c37f6bd55b8402bae2ab04402562e4f 4cf6d19846284f4bb5cb3731395de51b - - -] Failed to copy image 744788c2-7783-46d5-973b-c6fc549f9874 to volume: 4a3ddb09-6342-4cfc-96c5-03e6fff93c36, error: Bad or unexpected response from the storage volume backend API: Unable to fetch connection information from backend: create_host: No initiators or wwpns supplied. 2015-02-04 14:12:20.967 21245 WARNING cinder.volume.manager [req-a9780d29-e87f-46af-9f28-7f27a55c7b17 2c37f6bd55b8402bae2ab04402562e4f 4cf6d19846284f4bb5cb3731395de51b - - -] Task 'cinder.volume.flows.manager.create_volume.CreateVolumeFromSpecTask;volume:create' (9342ce99-ef5c-4f2f-a9ee-bc115f8aa6b6) transitioned into state 'FAILURE' EDIT ATTACHMENT (cinder volume to nova instance) error in volume.log: 2015-02-04 16:53:52.594 21245 INFO cinder.volume.manager [-] Updating volume replication status. 2015-02-04 16:54:16.010 21245 ERROR cinder.volume.drivers.ibm.storwize_svc [req-7537dce4-fa77-4abe-9e3f-22d98fd83133 2c37f6bd55b8402bae2ab04402562e4f fa6f9dd011df404b963141baf7547181 - - -] The connector does not contain the required information. 2015-02-04 16:54:16.012 21245 ERROR cinder.volume.manager [req-7537dce4-fa77-4abe-9e3f-22d98fd83133 2c37f6bd55b8402bae2ab04402562e4f fa6f9dd011df404b963141baf7547181 - - -] Unable to fetch connection information from backend: The connector does not contain the required information. 2015-02-04 16:54:16.056 21245 ERROR oslo.messaging.rpc.dispatcher [req-7537dce4-fa77-4abe-9e3f-22d98fd83133 2c37f6bd55b8402bae2ab04402562e4f fa6f9dd011df404b963141baf7547181 - - -] Exception during message handling: Bad or unexpected response from the storage volume backend API: Unable to fetch connection information from backend: The connector does not contain the required information. 2015-02-04 16:54:16.056 21245 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):

If this is for FibreChannel: 1) You need to make sure you have the kernel driver/module loaded for your FC HBA card. This is typically lpfc for Emulex cards 2) You need to have systool installed. For ubuntu, this is in the sysfsutils package (Verify that it's there by running 'sudo systool -c fc_host -v'