You have been subscribed to a public bug:
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
** Affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
** Affects: nova
Importance: Low
Status: Won't Fix
** Tags: libvirt
--
Unable to attach more than 6 scsi volumes
https://bugs.launchpad.net/bugs/1864279
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