Hi Everyone, I'm trying to migrate cinder volumes from one backend to another. Namely I'm migrating from an HPE Nimble Storage backend to a Ceph backend. My Problem: the volume migration speed is kinda sluggish - around 100 MB/s. I can read from a Nimble backed volume way faster. And of course the Ceph can also write more than 1GB/s. After quite some debugging, the problem seems to be: cinder uses multipathing to access the Nimble backed volumes. But for some reason cinder's volume migration explicitly doesn't use multipathing. (I found "multipath=false" in the cinder logs when looking for my slow migrations.) Question: is there a way to configure cinder to use multipathing for volume migrations when available. -- Karl-Heinz Preuß Linux Consultant Tel.: +49 1515 5806243 E-Mail: preuss@b1-systems.de B1 Systems GmbH Osterfeldstraße 7 / 85088 Vohburg / https://www.b1-systems.de GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt, HRB 3537