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I have 6 compute node, 1 control, 1 SAN switch (brocade 6505) and 1 SAN (IBM Storwize V3700). Openstack version is 3.6.0. Connect them with fiber channel. If I create a new volume in an openstack project, then it is allocated on the SAN and I can attach it to a volume, but if I have an existing volume on the SAN, than the openstack cant see it. Do you have any idea why? Thanks!

(sorry for my English)