Re: [libvirt] [Qemu-devel] Qemu migration with vhost-user-blk on top of local storage
On Wed, Jan 09, 2019 at 06:23:42PM +0800, wuzhouhui wrote:
Hi everyone,
I'm working qemu with vhost target (e.g. spdk), and I attempt to migrate VM with 2 local storages. One local storage is a regular file, e.g. /tmp/c74.qcow2, and the other is a malloc bdev that spdk created. This malloc bdev will exported to VM via vhost-user-blk. When I execute following command:
virsh migrate --live --persistent --unsafe --undefinesource --copy-storage-all \ --p2p --auto-converge --verbose --desturi qemu+tcp://<uri>/system vm0
The libvirt reports:
qemu-2.12.1: error: internal error: unable to execute QEMU command \ 'nbd-server-add': Cannot find device=drive-virtio-disk1 nor \ node_name=drive-virtio-disk1
Please post your libvirt domain XML.
Does it means that qemu with spdk on top of local storage don't support migration?
QEMU: 2.12.1 SPDK: 18.10
vhost-user-blk bypasses the QEMU block layer, so NBD storage migration at the QEMU level will not work for the vhost-user-blk disk. Stefan
-----Original Messages----- From: "Stefan Hajnoczi" <stefanha@gmail.com> Sent Time: 2019-01-09 20:42:58 (Wednesday) To: wuzhouhui <wuzhouhui14@mails.ucas.ac.cn> Cc: qemu-devel@nongnu.org, xieyongji@baidu.com, lilin24@baidu.com, libvir-list@redhat.com, spdk@lists.01.org Subject: Re: [Qemu-devel] Qemu migration with vhost-user-blk on top of local storage
On Wed, Jan 09, 2019 at 06:23:42PM +0800, wuzhouhui wrote:
Hi everyone,
I'm working qemu with vhost target (e.g. spdk), and I attempt to migrate VM with 2 local storages. One local storage is a regular file, e.g. /tmp/c74.qcow2, and the other is a malloc bdev that spdk created. This malloc bdev will exported to VM via vhost-user-blk. When I execute following command:
virsh migrate --live --persistent --unsafe --undefinesource --copy-storage-all \ --p2p --auto-converge --verbose --desturi qemu+tcp://<uri>/system vm0
The libvirt reports:
qemu-2.12.1: error: internal error: unable to execute QEMU command \ 'nbd-server-add': Cannot find device=drive-virtio-disk1 nor \ node_name=drive-virtio-disk1
Please post your libvirt domain XML.
My libvirt is based on libvirt-1.1.1-29.el7, and add many patches to satisfy our own needs, e.g. add support for vhost-user-blk. Post domain xml may not useful. Anyway, following is full contents of XML: <domain type='kvm'> <name>wzh</name> <uuid>a84e96e6-2c53-408d-986b-c709bc6a0e51</uuid> <memory unit='MiB'>4096</memory> <memoryBacking> <hugepages/> </memoryBacking> <currentMemory unit='MiB'>4096</currentMemory> <vcpu placement='static' cpuset='16-31'>2</vcpu> <os> <type arch='x86_64' machine='pc'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> </features> <clock offset='utc'> <timer name='rtc' tickpolicy='catchup'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/data/wzh/x86_64-softmmu/qemu-system-x86_64</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='none'/> <source file='/data/wzh/c74.qcow2'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> </disk> <disk type='vhost-user-blk' device='disk'> <source type='unix' path='/var/tmp/lv0' mode='client'> </source> <target dev='vdb' bus='virtio'/> <driver queues='4'/> </disk> <controller type='usb' index='0'> <alias name='usb0'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <serial type='pty'> <target port='0'/> <alias name='serial0'/> </serial> <serial type='pty'> <target port='1'/> <alias name='serial1'/> </serial> <input type='tablet' bus='usb'> <alias name='input0'/> </input> <input type='mouse' bus='ps2'/> <graphics type='vnc' autoport='yes' listen='0.0.0.0' keymap='en-us'> <listen type='address' address='0.0.0.0'/> </graphics> <video> <model type='cirrus' vram='9216' heads='1'/> <alias name='video0'/> </video> </devices> <seclabel type='none'/> </domain>
Does it means that qemu with spdk on top of local storage don't support migration?
QEMU: 2.12.1 SPDK: 18.10
vhost-user-blk bypasses the QEMU block layer, so NBD storage migration at the QEMU level will not work for the vhost-user-blk disk.
Stefan
On Wed, Jan 09, 2019 at 21:23:25 +0800, wuzhouhui wrote:
-----Original Messages----- From: "Stefan Hajnoczi" <stefanha@gmail.com> Sent Time: 2019-01-09 20:42:58 (Wednesday) To: wuzhouhui <wuzhouhui14@mails.ucas.ac.cn> Cc: qemu-devel@nongnu.org, xieyongji@baidu.com, lilin24@baidu.com, libvir-list@redhat.com, spdk@lists.01.org Subject: Re: [Qemu-devel] Qemu migration with vhost-user-blk on top of local storage
On Wed, Jan 09, 2019 at 06:23:42PM +0800, wuzhouhui wrote:
Hi everyone,
I'm working qemu with vhost target (e.g. spdk), and I attempt to migrate VM with 2 local storages. One local storage is a regular file, e.g. /tmp/c74.qcow2, and the other is a malloc bdev that spdk created. This malloc bdev will exported to VM via vhost-user-blk. When I execute following command:
virsh migrate --live --persistent --unsafe --undefinesource --copy-storage-all \ --p2p --auto-converge --verbose --desturi qemu+tcp://<uri>/system vm0
The libvirt reports:
qemu-2.12.1: error: internal error: unable to execute QEMU command \ 'nbd-server-add': Cannot find device=drive-virtio-disk1 nor \ node_name=drive-virtio-disk1
Please post your libvirt domain XML.
My libvirt is based on libvirt-1.1.1-29.el7, and add many patches to satisfy our own needs, e.g. add support for vhost-user-blk. Post domain xml may not useful.
So you added support for vhost-user-blk, but did not fix the NBD migration code. You are on your own, sorry. We can't support arbitrary downstream changes. Please either upstream your patches or make sure to skip it for vhost-user.
On Wed, 2019-01-09 at 21:23 +0800, wuzhouhui wrote:
-----Original Messages----- From: "Stefan Hajnoczi" <stefanha@gmail.com> Sent Time: 2019-01-09 20:42:58 (Wednesday) To: wuzhouhui <wuzhouhui14@mails.ucas.ac.cn> Cc: qemu-devel@nongnu.org, xieyongji@baidu.com, lilin24@baidu.com, libvir-list@redhat.com, spdk@lists.01.org Subject: Re: [Qemu-devel] Qemu migration with vhost-user-blk on top of local storage
On Wed, Jan 09, 2019 at 06:23:42PM +0800, wuzhouhui wrote:
Hi everyone,
I'm working qemu with vhost target (e.g. spdk), and I attempt to migrate VM with 2 local storages. One local storage is a regular file, e.g. /tmp/c74.qcow2, and the other is a malloc bdev that spdk created. This malloc bdev will exported to VM via vhost-user-blk. When I execute following command:
virsh migrate --live --persistent --unsafe --undefinesource -- copy-storage-all \ --p2p --auto-converge --verbose --desturi qemu+tcp://<uri>/system vm0
The libvirt reports:
qemu-2.12.1: error: internal error: unable to execute QEMU command \ 'nbd-server-add': Cannot find device=drive-virtio-disk1 nor \ node_name=drive-virtio-disk1
Please post your libvirt domain XML.
My libvirt is based on libvirt-1.1.1-29.el7, and add many patches to satisfy our own needs, e.g. add support for vhost-user-blk. Post domain xml may not useful. Anyway, following is full contents of XML:
<domain type='kvm'> <name>wzh</name> <uuid>a84e96e6-2c53-408d-986b-c709bc6a0e51</uuid> <memory unit='MiB'>4096</memory> <memoryBacking> <hugepages/> </memoryBacking> <currentMemory unit='MiB'>4096</currentMemory> <vcpu placement='static' cpuset='16-31'>2</vcpu> <os> <type arch='x86_64' machine='pc'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> </features> <clock offset='utc'> <timer name='rtc' tickpolicy='catchup'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/data/wzh/x86_64-softmmu/qemu-system- x86_64</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='none'/> <source file='/data/wzh/c74.qcow2'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> </disk>
<disk type='vhost-user-blk' device='disk'> <source type='unix' path='/var/tmp/lv0' mode='client'> </source> <target dev='vdb' bus='virtio'/> <driver queues='4'/> </disk>
<controller type='usb' index='0'> <alias name='usb0'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <serial type='pty'> <target port='0'/> <alias name='serial0'/> </serial> <serial type='pty'> <target port='1'/> <alias name='serial1'/> </serial> <input type='tablet' bus='usb'> <alias name='input0'/> </input> <input type='mouse' bus='ps2'/> <graphics type='vnc' autoport='yes' listen='0.0.0.0' keymap='en-us'> <listen type='address' address='0.0.0.0'/> </graphics> <video> <model type='cirrus' vram='9216' heads='1'/> <alias name='video0'/> </video> </devices> <seclabel type='none'/> </domain>
Does it means that qemu with spdk on top of local storage don't support migration?
QEMU: 2.12.1 SPDK: 18.10
vhost-user-blk bypasses the QEMU block layer, so NBD storage migration at the QEMU level will not work for the vhost-user-blk disk.
Stefan
Don't know if this is the case that wuzhouhui is using but generally migration should work if all storages are accesible from both machines. The QEMU image and Malloc bdev should be exposed using some kind of network sharing. SPDK on migration target should be configured the same way as on source machine. We are testing this issuing QEMU monitor commands so I can't help with libvirt here. Example setup/test case we are using in one of our tests: Machine1: Expose VM image over SSHF Expose some block device using SPDK nvmf target SPDK nvmf initiator: - connects to Machine1 SPDK nvmf target to access block device SPDK vhost-scsi: - presents block device to QEMU from SPDK nvmf initiator: QEMU VM uses - shared VM image - block device from SPDK nvmf initiator over vhost-user-scsi Machine2: SPDK nvmf initiator: - connects to Machine1 SPDK nvmf target to access block device SPDK vhost-scsi: - presents block device to QEMU from nvmf initiator: QEMU instance - waiting for incoming migration - shared VM image over SSHFS - block device from SPDK nvmf initiator over vhost-user-scsi Some traffic is generated using FIO and then we just migrate VM from Machine1 to Machine2. Pawel
_______________________________________________ SPDK mailing list SPDK@lists.01.org https://lists.01.org/mailman/listinfo/spdk
-----Original Messages----- From: "Wodkowski, PawelX" <pawelx.wodkowski@intel.com> Sent Time: 2019-01-10 00:19:48 (Thursday) To: "stefanha@gmail.com" <stefanha@gmail.com>, "spdk@lists.01.org" <spdk@lists.01.org> Cc: "libvir-list@redhat.com" <libvir-list@redhat.com>, "xieyongji@baidu.com" <xieyongji@baidu.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "lilin24@baidu.com" <lilin24@baidu.com> Subject: Re: [SPDK] [Qemu-devel] Qemu migration with vhost-user-blk on top of local storage
On Wed, 2019-01-09 at 21:23 +0800, wuzhouhui wrote:
-----Original Messages----- From: "Stefan Hajnoczi" <stefanha@gmail.com> Sent Time: 2019-01-09 20:42:58 (Wednesday) To: wuzhouhui <wuzhouhui14@mails.ucas.ac.cn> Cc: qemu-devel@nongnu.org, xieyongji@baidu.com, lilin24@baidu.com, libvir-list@redhat.com, spdk@lists.01.org Subject: Re: [Qemu-devel] Qemu migration with vhost-user-blk on top of local storage
On Wed, Jan 09, 2019 at 06:23:42PM +0800, wuzhouhui wrote:
Hi everyone,
I'm working qemu with vhost target (e.g. spdk), and I attempt to migrate VM with 2 local storages. One local storage is a regular file, e.g. /tmp/c74.qcow2, and the other is a malloc bdev that spdk created. This malloc bdev will exported to VM via vhost-user-blk. When I execute following command:
virsh migrate --live --persistent --unsafe --undefinesource -- copy-storage-all \ --p2p --auto-converge --verbose --desturi qemu+tcp://<uri>/system vm0
The libvirt reports:
qemu-2.12.1: error: internal error: unable to execute QEMU command \ 'nbd-server-add': Cannot find device=drive-virtio-disk1 nor \ node_name=drive-virtio-disk1
Please post your libvirt domain XML.
My libvirt is based on libvirt-1.1.1-29.el7, and add many patches to satisfy our own needs, e.g. add support for vhost-user-blk. Post domain xml may not useful. Anyway, following is full contents of XML:
<domain type='kvm'> <name>wzh</name> <uuid>a84e96e6-2c53-408d-986b-c709bc6a0e51</uuid> <memory unit='MiB'>4096</memory> <memoryBacking> <hugepages/> </memoryBacking> <currentMemory unit='MiB'>4096</currentMemory> <vcpu placement='static' cpuset='16-31'>2</vcpu> <os> <type arch='x86_64' machine='pc'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> </features> <clock offset='utc'> <timer name='rtc' tickpolicy='catchup'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/data/wzh/x86_64-softmmu/qemu-system- x86_64</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='none'/> <source file='/data/wzh/c74.qcow2'/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> </disk>
<disk type='vhost-user-blk' device='disk'> <source type='unix' path='/var/tmp/lv0' mode='client'> </source> <target dev='vdb' bus='virtio'/> <driver queues='4'/> </disk>
<controller type='usb' index='0'> <alias name='usb0'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <serial type='pty'> <target port='0'/> <alias name='serial0'/> </serial> <serial type='pty'> <target port='1'/> <alias name='serial1'/> </serial> <input type='tablet' bus='usb'> <alias name='input0'/> </input> <input type='mouse' bus='ps2'/> <graphics type='vnc' autoport='yes' listen='0.0.0.0' keymap='en-us'> <listen type='address' address='0.0.0.0'/> </graphics> <video> <model type='cirrus' vram='9216' heads='1'/> <alias name='video0'/> </video> </devices> <seclabel type='none'/> </domain>
Does it means that qemu with spdk on top of local storage don't support migration?
QEMU: 2.12.1 SPDK: 18.10
vhost-user-blk bypasses the QEMU block layer, so NBD storage migration at the QEMU level will not work for the vhost-user-blk disk.
Stefan
Don't know if this is the case that wuzhouhui is using but generally
My case is different from yours. All storages (including qemu image and malloc bdev) are local, and only accessible from one of hosts. Anyway, thanks for everyone's response. wuzhouhui
migration should work if all storages are accesible from both machines. The QEMU image and Malloc bdev should be exposed using some kind of network sharing. SPDK on migration target should be configured the same way as on source machine.
We are testing this issuing QEMU monitor commands so I can't help with libvirt here.
Example setup/test case we are using in one of our tests:
Machine1: Expose VM image over SSHF Expose some block device using SPDK nvmf target SPDK nvmf initiator: - connects to Machine1 SPDK nvmf target to access block device SPDK vhost-scsi: - presents block device to QEMU from SPDK nvmf initiator: QEMU VM uses - shared VM image - block device from SPDK nvmf initiator over vhost-user-scsi
Machine2: SPDK nvmf initiator: - connects to Machine1 SPDK nvmf target to access block device SPDK vhost-scsi: - presents block device to QEMU from nvmf initiator: QEMU instance - waiting for incoming migration - shared VM image over SSHFS - block device from SPDK nvmf initiator over vhost-user-scsi
Some traffic is generated using FIO and then we just migrate VM from Machine1 to Machine2.
Pawel
_______________________________________________ SPDK mailing list SPDK@lists.01.org https://lists.01.org/mailman/listinfo/spdk
_______________________________________________ SPDK mailing list SPDK@lists.01.org https://lists.01.org/mailman/listinfo/spdk
participants (4)
-
Peter Krempa -
Stefan Hajnoczi -
Wodkowski, PawelX -
wuzhouhui