Looks like it's been fixed on RHEL 7.7 too [1]. If you're on a different OS, I'd suggest opening a bug against the libvirt component for same and requesting a backport. I don't think there's much to do here from a nova perspective.
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1741782 ** Bug watch added: Red Hat Bugzilla #1741782 https://bugzilla.redhat.com/show_bug.cgi?id=1741782 ** Changed in: nova Status: Confirmed => Won't Fix -- 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/1864279 Title: Unable to attach more than 6 scsi volumes Status in OpenStack Compute (nova): Won't Fix Bug description: Scsi volume with unit number 7 can not be attached because of this libvirt check: https://github.com/libvirt/libvirt/blob/89237d534f0fe950d06a2081089154160c6c2224/src/conf/domain_conf.c#L4796 Nova automatically increase volume unit number by 1, and when I attach 7th volume to vm I've got this error: 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [req-156a4725-279d-4173-9f11-85125e4a3e47] [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] Failed to attach volume at mountpoint: /dev/sdh: libvirt.libvirtError: Requested operation is not valid: Domain already contains a disk with that address 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] Traceback (most recent call last): 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] File "/usr/lib/python3/dist-packages/nova/virt/libvirt/driver.py", line 1810, in attach_volume 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] guest.attach_device(conf, persistent=True, live=live) 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] File "/usr/lib/python3/dist-packages/nova/virt/libvirt/guest.py", line 305, in attach_device 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] self._domain.attachDeviceFlags(device_xml, flags=flags) 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 190, in doit 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] result = proxy_call(self._autowrap, f, *args, **kwargs) 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 148, in proxy_call 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] rv = execute(f, *args, **kwargs) 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 129, in execute 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] six.reraise(c, e, tb) 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] File "/usr/lib/python3/dist-packages/six.py", line 693, in reraise 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] raise value 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] File "/usr/lib/python3/dist-packages/eventlet/tpool.py", line 83, in tworker 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] rv = meth(*args, **kwargs) 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] File "/usr/lib/python3/dist-packages/libvirt.py", line 605, in attachDeviceFlags 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] if ret == -1: raise libvirtError ('virDomainAttachDeviceFlags() failed', dom=self) 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] libvirt.libvirtError: Requested operation is not valid: Domain already contains a disk with that address 2020-02-21 09:12:53.309 3572 ERROR nova.virt.libvirt.driver [instance: 3532baf6-a0a4-4a81-84f9-3622c713435f] After patching libvirt driver to skip unit 7 I can attach more than 6 volumes. ii nova-compute 2:20.0.0-0ubuntu1~cloud0 ii nova-compute-kvm 2:20.0.0-0ubuntu1~cloud0 ii nova-compute-libvirt 2:20.0.0-0ubuntu1~cloud0 ii libvirt0:amd64 5.4.0-0ubuntu5~cloud0 ii librbd1 14.2.4-1bionic ii libvirt-daemon-driver-storage-rbd 5.4.0-0ubuntu5~cloud0 ii python-rbd 14.2.4-1bionic ii python3-rbd 14.2.4-1bionic To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1864279/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
