Bug 1285355
| Summary: | [ppc64le] Guest can't detect sPAPR-VSCSI hotplugged disk | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Elad <ebenahar> | ||||||
| Component: | qemu-kvm-rhev | Assignee: | David Gibson <dgibson> | ||||||
| Status: | CLOSED DUPLICATE | QA Contact: | Virtualization Bugs <virt-bugs> | ||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | medium | ||||||||
| Version: | 7.2 | CC: | alitke, amureini, bazulay, bugs, dyuan, dzheng, ebenahar, ecohen, gklein, gsun, hannsj_uhl, istein, juzhang, knoel, lsurette, michal.skrivanek, michen, mzhan, qzhang, tnisan, virt-maint, ycui, yeylon, ylavi, zhwang | ||||||
| Target Milestone: | rc | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | ppc64le | ||||||||
| OS: | Unspecified | ||||||||
| Whiteboard: | storage | ||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2015-12-07 01:11:05 UTC | Type: | Bug | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Embargoed: | |||||||||
| Bug Depends On: | |||||||||
| Bug Blocks: | 1201513 | ||||||||
| Attachments: |
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push it down to qemu? The same for hot-unplug In VDSM side the logs show that the hot plugging is successful- namely VDSM got the disk plug request with all its attributes and sent them to libvirt. no error occured, and the request returned success.. probably it got lost somewhere later in the libvirt-qemu chain.. Elad, please include QEMU & Libvirt logs. Michal, we'll wait for the relevant logs first and then decide how to proceed. QEMU log is attached (see golden_env_mixed_virtio_0.log) Libvirt log doesn't exist on RHEL7.2 Correction: The issue reproduced for sPAPR-VSCSI preallocated disk also. Created attachment 1099277 [details] logs from engine and host, includes libvirtd.log (In reply to Yaniv Kaul from comment #7) > - Did Virt QE confirm it's working from their side? Didn't check with them, I'll send them a request for their tests results. > - What do you mean 'libvirt log doesn't exist' ? So how do we get its logs? Sorry, my confusion. It exists, attached. From libvirtd.log (the log is 5 hours early): 2015-11-26 12:45:13.061+0000: 11709: debug : virDomainAttachDevice:8339 : dom=0x3fff84002310, (VM: name=vm-1, uuid=6bc01080-7231-47f6-8639-c358425ea602), xml=<disk device="disk" snapshot="no" type="block"> <address bus="0" controller="0" target="0" type="drive" unit="7"/> <source dev="/rhev/data-center/2a0ea7f8-bafe-4b0b-a5a1-4ce1a33271a6/42d4f247-1173-4275-9588-39789a850ddf/images/bd67d409-b6b6-4320-bea7-0a9e40f36944/237eab8b-16a5-4f8d-b5ff-643b3f52eb19"/> <target bus="scsi" dev="sdf"/> <serial>bd67d409-b6b6-4320-bea7-0a9e40f36944</serial> <driver cache="none" error_policy="stop" io="native" name="qemu" type="raw"/> </disk> > - On the guest, it's better to run 'lsscsi' and/or 'lspci' - to also ensure > this is not an issue of mis-identifying the device as a disk. After hotplug action: [root@dhcp167-130 ~]# date && lsscsi Thu 26 Nov 07:52:44 EST 2015 [0:0:0:0] cd/dvd QEMU QEMU CD-ROM 2.3. /dev/sr0 Hi Elad We met a similar issue with this bug previous that the iscsi disk won't detect by guest after we hotplug it, dev suggest scan it inside the guest in bug 1232106, hope it's helpfull for you. pkginfo libvirt-1.2.17-13.el7.ppc64le steps 1.Prepare a running guest # virsh list Id Name State ---------------------------------------------------- 5 rhel72 running 2.Attach an iscsi disk to the guest #virsh attach-disk rhel72 /var/lib/libvirt/images/test.img sdb 3.Check the guest's xml #virsh dumpxml rhel72 -- <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/var/lib/libvirt/images/test.img'/> <backingStore/> <target dev='sdb' bus='scsi'/> <alias name='scsi0-0-0-1'/> <address type='drive' controller='0' bus='0' target='0' unit='1'/> </disk> <controller type='scsi' index='0'> <alias name='scsi0'/> <address type='spapr-vio' reg='0x1000'/> </controller> 4.Login guest, couldn't detact the scsi disk 5.scan it scsi bus manually inside guest, then we could find it guest#for h in /sys/class/scsi_host/host*; do echo '- - -' >"$h/scan" done guest# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 100M 0 disk vda 252:0 0 8G 0 disk ├─vda1 252:1 0 4M 0 part ├─vda2 252:2 0 500M 0 part /boot └─vda3 252:3 0 7.5G 0 part ├─rhel-root 253:0 0 6.7G 0 lvm / └─rhel-swap 253:1 0 820M 0 lvm [SWAP] Elad, can you please check zhenfeng wang's proposed procedure? This looks as though it may not be bug. After scanning the scsi bus in the guest, the sPAPR-VSCSI hotplugged disk appears. [root@dhcp167-130 ~]# lsscsi [0:0:0:0] cd/dvd QEMU QEMU CD-ROM 2.3. /dev/sr0 [0:0:0:1] cd/dvd QEMU QEMU CD-ROM 2.3. /dev/sr1 [root@dhcp167-130 ~]# echo '- - -' > /sys/class/scsi_host/host0/scan [root@dhcp167-130 ~]# lsscsi [0:0:0:0] cd/dvd QEMU QEMU CD-ROM 2.3. /dev/sr0 [0:0:0:1] cd/dvd QEMU QEMU CD-ROM 2.3. /dev/sr1 [0:0:0:3] disk QEMU QEMU HARDDISK 2.3. /dev/sda Allon, in any other disk interface, the hotplugged disk appears without the need to scan the scsi bus. I guess this is more of a RHEL issue. Checked with RHEL7.2 installed on the guest, kernel-3.10.0-327.el7.ppc64le. On the host: kernel-3.10.0-327.2.1.el7.ppc64le, libvirt-daemon-1.2.17-13.el7_2.2.ppc64le, vdsm-4.17.11-0.el7ev.noarch (In reply to Elad from comment #13) > After scanning the scsi bus in the guest, the sPAPR-VSCSI hotplugged disk > appears. > > [root@dhcp167-130 ~]# lsscsi > [0:0:0:0] cd/dvd QEMU QEMU CD-ROM 2.3. /dev/sr0 > [0:0:0:1] cd/dvd QEMU QEMU CD-ROM 2.3. /dev/sr1 > [root@dhcp167-130 ~]# echo '- - -' > /sys/class/scsi_host/host0/scan > [root@dhcp167-130 ~]# lsscsi > [0:0:0:0] cd/dvd QEMU QEMU CD-ROM 2.3. /dev/sr0 > [0:0:0:1] cd/dvd QEMU QEMU CD-ROM 2.3. /dev/sr1 > [0:0:0:3] disk QEMU QEMU HARDDISK 2.3. /dev/sda > > Allon, in any other disk interface, the hotplugged disk appears without the > need to scan the scsi bus. I guess this is more of a RHEL issue. Please move to RHEL, then. > > Checked with RHEL7.2 installed on the guest, kernel-3.10.0-327.el7.ppc64le. > On the host: kernel-3.10.0-327.2.1.el7.ppc64le, > libvirt-daemon-1.2.17-13.el7_2.2.ppc64le, vdsm-4.17.11-0.el7ev.noarch Pushing down to qemu to start the investigation - should possibly (probably?) be moved to the right team within the platform group. Right, there is currently no notification implemented to tell a guest an spapr-vscsi disk has been plugged so it could rescan the scsi bus. I'm not sure if this is possible with the existing protocols, or would require protocol extensions. If the latter, then this is not going to happen - if you want hotplug you should use virtio instead. But if the existing SRP protocol can support hotplug, we should implement it - I'll need to look into this. In light of comment #13 and https://bugzilla.redhat.com/show_bug.cgi?id=1232106#c8 I'm removing the blocker flag and decreasing the severity. I would think we can even close it the same way as bug 1232106, but leaving it up to David's/Karen's consideration Actually, as far as I can tell, this is a duplicate of bug 1232106, and as such, not a bug. SCSI disks simply aren't detected without an explicit rescan from the guest side. Unless there's some different in behaviour from *SCSI* disks on x86, or from virtio-scsi, I don't see that there's any bug here. *** This bug has been marked as a duplicate of bug 1232106 *** |
Created attachment 1098797 [details] logs from engine and host Description of problem: On PPC64le, a hotplugged sPAPR-VSCS thin disk is not visible by the guest after the hotplug operation. Reproduced on both block and file storage. sPAPR-VSCS preallocated disk hotplug works as expected. Version-Release number of selected component (if applicable): Engine: rhevm-3.6.0.3-0.1.el6.noarch Host: Red Hat Enterprise Linux Server release 7.2 (Maipo) Linux ibm-p8-rhevm-03.rhts.eng.bos.redhat.com 3.10.0-327.2.1.el7.ppc64le #1 SMP Fri Nov 13 14:35:26 EST 2015 ppc64le ppc64le ppc64le GNU/Linux vdsm-python-4.17.10.1-0.el7ev.noarch vdsm-yajsonrpc-4.17.10.1-0.el7ev.noarch vdsm-4.17.10.1-0.el7ev.noarch vdsm-jsonrpc-4.17.10.1-0.el7ev.noarch vdsm-cli-4.17.10.1-0.el7ev.noarch vdsm-xmlrpc-4.17.10.1-0.el7ev.noarch vdsm-infra-4.17.10.1-0.el7ev.noarch libvirt-daemon-driver-storage-1.2.17-13.el7_2.2.ppc64le libvirt-docs-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-driver-secret-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-driver-lxc-1.2.17-13.el7_2.2.ppc64le libvirt-devel-1.2.17-13.el7_2.2.ppc64le libvirt-lock-sanlock-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-driver-network-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-driver-nodedev-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-config-nwfilter-1.2.17-13.el7_2.2.ppc64le libvirt-1.2.17-13.el7_2.2.ppc64le libvirt-login-shell-1.2.17-13.el7_2.2.ppc64le libvirt-python-1.2.17-2.el7.ppc64le libvirt-daemon-driver-nwfilter-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-driver-interface-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-config-network-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-lxc-1.2.17-13.el7_2.2.ppc64le libvirt-debuginfo-1.2.17-13.el7_2.2.ppc64le libvirt-client-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-driver-qemu-1.2.17-13.el7_2.2.ppc64le libvirt-daemon-kvm-1.2.17-13.el7_2.2.ppc64le qemu-kvm-tools-rhev-2.3.0-31.el7_2.3.ppc64le qemu-kvm-common-rhev-2.3.0-31.el7_2.3.ppc64le ipxe-roms-qemu-20130517-7.gitc4bce43.el7.noarch qemu-kvm-rhev-2.3.0-31.el7_2.3.ppc64le qemu-kvm-rhev-debuginfo-2.3.0-31.el7_2.3.ppc64le qemu-img-rhev-2.3.0-31.el7_2.3.ppc64le Guest: Red Hat Enterprise Linux Server release 7.2 (Maipo) Linux dhcp167-130.klab.eng.bos.redhat.com 3.10.0-327.2.1.el7.ppc64le #1 SMP Fri Nov 13 14:35:26 EST 2015 ppc64le ppc64le ppc64le GNU/Linux How reproducible: Always Steps to Reproduce: On PPC64LE env. 1. Create a VM with RHEL OS 2. Hotplug a sPAPR-VSCSI thin disk (storage type doesn't matter) 3. On the guest, check lsblk Actual results: The disk is not seen by the guest. Before disk hotplug, on the guest: [root@dhcp167-130 dev]# date && lsblk Wed 25 Nov 07:42:31 EST 2015 NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 1024M 0 rom vda 252:0 0 10G 0 disk ├─vda1 252:1 0 4M 0 part ├─vda2 252:2 0 500M 0 part /boot └─vda3 252:3 0 9.5G 0 part ├─rhel_dhcp167--130-root 253:0 0 8.5G 0 lvm / └─rhel_dhcp167--130-swap 253:1 0 1G 0 lvm [SWAP] ============================================================================== Hotplug In engine.log: 2015-11-25 14:44:33,397 INFO [org.ovirt.engine.core.bll.HotPlugDiskToVmCommand] (org.ovirt.thread.pool-7-thread-19) [33fe6e34] Lock Acquired to object 'EngineLock:{exclusiveLocks='[b831c495-c3e0-4986-abde-746d9f0573cf=<DISK, ACTION_TYPE_FAILED_DISKS_LOCKED$diskAliases golden_env_mixed_virtio_0_Disk1>]', sharedLocks='[2e5e8165-aadc-4819-8f4b-5f950aab4936=<VM, ACTION_TYPE_FAILED_VM_IS_LOCKED>]'}' 2015-11-25 14:44:33,413 INFO [org.ovirt.engine.core.bll.HotPlugDiskToVmCommand] (org.ovirt.thread.pool-7-thread-19) [33fe6e34] Running command: HotPlugDiskToVmCommand internal: true. Entities affected : ID: 2e5e8165-aadc-4819-8f4b-5f950aab4936 Type: VMAction group CONFIGURE_VM_STORAGE with role type USER 2015-11-25 14:44:33,427 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.HotPlugDiskVDSCommand] (org.ovirt.thread.pool-7-thread-19) [33fe6e34] START, HotPlugDiskVDSCommand(HostName = host_mixed_1, HotPlugDiskVDSParameters:{runAsync='true', hostId='296817a6-8cc4-42bf-bcbb-287ea1e640c4', vmId='2e5e8165-aadc-4819-8f4b-5f950aab4936', diskId='b831c495-c3e0-4986-abde-746d9f0573cf', addressMap='[unit=3, bus=0, target=0, controller=0, type=drive]'}), log id: 535d1ddd 2015-11-25 14:44:36,360 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.HotPlugDiskVDSCommand] (org.ovirt.thread.pool-7-thread-19) [33fe6e34] FINISH, HotPlugDiskVDSCommand, log id: 535d1ddd 2015-11-25 14:44:36,368 INFO [org.ovirt.engine.core.bll.HotPlugDiskToVmCommand] (org.ovirt.thread.pool-7-thread-19) [33fe6e34] Lock freed to object 'EngineLock:{exclusiveLocks='[b831c495-c3e0-4986-abde-746d9f0573cf=<DISK, ACTION_TYPE_FAILED_DISKS_LOCKED$diskAliases golden_env_mixed_virtio_0_Disk1>]', sharedLocks='[2e5e8165-aadc-4819-8f4b-5f950aab4936=<VM, ACTION_TYPE_FAILED_VM_IS_LOCKED>]'}' ============================================================================== Hotplug call in vdsm.log: Thread-41416::DEBUG::2015-11-25 07:44:30,741::__init__::503::jsonrpc.JsonRpcServer::(_serveRequest) Calling 'VM.hotplugDisk' in bridge with {u'params': {u'vmId': u'2e5e8165-aadc-4819-8f4b-5f950aab4936', u'drive': {u'iface': u'scsi', u'format': u'cow', u'optional': u'false', u'poolID': u'41c0d682-de18-45cf-8f70-81471be76a99', u'volumeID': u'452e0080-f5c7-43ca-984b-eebe82ad4f09', u'imageID': u'b831c495-c3e0-4986-abde-746d9f0573cf', u'specParams': {}, u'readonly': u'false', u'domainID': u'2f9b37ca-b015-4c24-a89d-daddd5c7169e', u'deviceId': u'b831c495-c3e0-4986-abde-746d9f0573cf', u'address': {u'bus': u'0', u'controller': u'0', u'type': u'drive', u'target': u'0', u'unit': u'3'}, u'device': u'disk', u'shared': u'false', u'propagateErrors': u'off', u'type': u'disk'}}, u'vmID': u'2e5e8165-aadc-4819-8f4b-5f950aab4936'} Thread-41416::INFO::2015-11-25 07:44:33,410::vm::2577::virt.vm::(hotplugDisk) vmId=`2e5e8165-aadc-4819-8f4b-5f950aab4936`::Hotplug disk xml: <disk device="disk" snapshot="no" type="block"> <address bus="0" controller="0" target="0" type="drive" unit="3"/> <source dev="/rhev/data-center/41c0d682-de18-45cf-8f70-81471be76a99/2f9b37ca-b015-4c24-a89d-daddd5c7169e/images/b831c495-c3e0-4986-abde-746d9f0573cf/452e0080-f5c7-43ca-984b-eebe82ad4f09"/> <target bus="scsi" dev="sdd"/> <serial>b831c495-c3e0-4986-abde-746d9f0573cf</serial> <driver cache="none" error_policy="stop" io="native" name="qemu" type="qcow2"/> </disk> Thread-41416::DEBUG::2015-11-25 07:44:33,452::__init__::533::jsonrpc.JsonRpcServer::(_serveRequest) Return 'VM.hotplugDisk' in bridge with {u'acpiEnable': u'true', u'emulatedMachine': u'pseries-rhel7.2.0', u'table tEnable': u'true', 'pid': '21191', u'memGuaranteedSize': 512, u'spiceSslCipherSuite': u'DEFAULT', 'displaySecurePort': '-1', u'timeOffset': u'0', u'cpuType': u'POWER8', u'smp': u'1', 'pauseCode': 'NOERR', u'smartc ardEnable': u'false', u'custom': {u'device_d752f9f4-a715-4e73-a37d-ce01ffa3dfc3device_88af3c97-657a-4c61-a6b2-41fa41b909f3device_7fa97eef-41b0-42dd-9a92-07df8b81c69c': u"VmDevice:{id='VmDeviceId:{deviceId='7fa97ee f-41b0-42dd-9a92-07df8b81c69c', vmId='2e5e8165-aadc-4819-8f4b-5f950aab4936'}', device='unix', type='CHANNEL', bootOrder='0', specParams='[]', address='{bus=0, controller=0, type=virtio-serial, port=2}', managed='false', plugged='true', readOnly='false', deviceAlias='channel1', customProperties='[]', snapshotId='null', logicalName='null', usingScsiReservation='false'}", u'device_d752f9f4-a715-4e73-a37d-ce01ffa3dfc3device_88af3c97-657a-4c61-a6b2-41fa41b909f3': u"VmDevice:{id='VmDeviceId:{deviceId='88af3c97-657a-4c61-a6b2-41fa41b909f3', vmId='2e5e8165-aadc-4819-8f4b-5f950aab4936'}', device='unix', type='CHANNEL', bootOrder='0', specParams='[]', address='{bus=0, controller=0, type=virtio-serial, port=1}', managed='false', plugged='true', readOnly='false', deviceAlias='channel0', customProperties='[]', snapshotId='null', logicalName='null', usingScsiReservation='false'}", u'device_d752f9f4-a715-4e73-a37d-ce01ffa3dfc3': u"VmDevice:{id='VmDeviceId:{deviceId='d752f9f4-a715-4e73-a37d-ce01ffa3dfc3', vmId='2e5e8165-aadc-4819-8f4b-5f950aab4936'}', device='scsi', type='CONTROLLER', bootOrder='0', specParams='[]', address='{type=spapr-vio, reg=0x2000}', managed='false', plugged='true', readOnly='false', deviceAlias='scsi0', customProperties='[]', snapshotId='null', logicalName='null', usingScsiReservation='false'}"}, u'vmType': u'kvm', u'memSize': 1024, u'smpCoresPerSocket': u'1', u'vmName': u'golden_env_mixed_virtio_0', u'nice': u'0', 'status': 'Up', u'bootMenuEnable': u'false', u'vmId': u'2e5e8165-aadc-4819-8f4b-5f950aab4936', 'displayIp': '10.16.69.249', 'displayPort': u'5900', 'guestDiskMapping': {u'0QEMU_QEMU_CD-ROM': {u'name': u'/dev/sr0'}, u'118a0eac-b5c2-43ce-9': {u'name': u'/dev/vdb'}, u'a96f8b40-4e38-4ac6-a': {u'name': u'/dev/vda'}}, u'spiceSecureChannels': u'smain,sinputs,scursor,splayback,srecord,sdisplay,susbredir,ssmartcard', 'nicModel': 'rtl8139,pv', u'keyboardLayout': u'en-us', u'kvmEnable': u'true', u'transparentHugePages': u'true', u'displayNetwork': u'ovirtmgmt', u'devices': [{'target': 1048576, u'specParams': {u'model': u'virtio'}, 'alias': u'balloon0', 'deviceType': u'balloon', u'deviceId': u'9dc46d73-4e71-4f90-9f93-b2ccfd2df212', u'address': {u'slot': u'0x06', u'bus': u'0x00', u'domain': u'0x0000', u'type': u'pci', u'function': u'0x0'}, u'device': u'memballoon', u'type': u'balloon'}, {u'index': u'0', 'alias': u'scsi0', 'deviceType': u'controller', u'address': {u'type': u'spapr-vio', u'reg': u'0x2000'}, u'device': u'scsi', u'type': u'controller'}, {u'specParams': {}, 'alias': u'virtio-serial0', 'deviceType': u'controller', u'deviceId': u'5d14ea14-eef2-4676-af1f-183f4e9222c2', u'address': {u'slot': u'0x03', u'bus': u'0x00', u'domain': u'0x0000', u'type': u'pci', u'function': u'0x0'}, u'device': u'virtio-serial', u'type': u'controller'}, {u'specParams': {u'vram': u'32768', u'heads': u'1'}, 'alias': u'video0', 'deviceType': u'video', u'deviceId': u'4bc4f999-f260-41ca-9cab-53abf09222cd', u'address': {u'slot': u'0x07', u'bus': u'0x00', u'domain': u'0x0000', u'type': u'pci', u'function': u'0x0'}, u'device': u'vga', u'type': u'video'}, {u'specParams': {'displayNetwork': u'ovirtmgmt', 'displayIp': '10.16.69.249'}, 'deviceType': u'graphics', u'deviceId': u'269c582e-45f3-426c-96c1-499bf138d6fa', u'device': u'vnc', u'type': u'graphics', 'port': u'5900'}, {u'nicModel': u'pv', u'macAddr': u'00:1a:4a:16:01:51', u'linkActive': True, u'network': u'ovirtmgmt', u'specParams': {u'inbound': {}, u'outbound': {}}, u'filter': u'vdsm-no-mac-spoofing', 'alias': u'net0', 'deviceType': u'interface', u'deviceId': u'61cda16a-a8da-40b4-bf48-3477988b055e', u'address': {u'slot': u'0x01', u'bus': u'0x00', u'domain': u'0x0000', u'type': u'pci', u'function': u'0x0'}, u'device': u'bridge', u'type': u'interface', 'name': u'vnet0'}, {u'index': u'0', u'iface': u'scsi', 'name': u'sda', 'alias': u'scsi0-0-0-0', u'specParams': {u'path': u''}, u'readonly': 'True', 'deviceType': u'disk', u'deviceId': u'659de35b-c05f-49c7-bb72-1df41d0030bf', u'address': {u'bus': u'0', u'controller': u'0', u'type': u'drive', u'target': u'0', u'unit': u'0'}, u'device': u'cdrom', u'shared': u'false', u'path': '', u'type': u'disk'}, {u'poolID': u'41c0d682-de18-45cf-8f70-81471be76a99', 'volumeInfo': {'domainID': u'47bd4adb-7bd4-425d-98e3-b105f34a76a0', 'volType': 'path', 'leaseOffset': 0, 'volumeID': u'e48cca8c-4cf6-429c-ab6c-56eff92497ec', 'leasePath': u'/rhev/data-center/mnt/10.16.29.93:_ppc__ge__1__nfs__1/47bd4adb-7bd4-425d-98e3-b105f34a76a0/images/a96f8b40-4e38-4ac6-a51f-dc26c4f2cc54/e48cca8c-4cf6-429c-ab6c-56eff92497ec.lease', 'imageID': u'a96f8b40-4e38-4ac6-a51f-dc26c4f2cc54', 'path': u'/rhev/data-center/mnt/10.16.29.93:_ppc__ge__1__nfs__1/47bd4adb-7bd4-425d-98e3-b105f34a76a0/images/a96f8b40-4e38-4ac6-a51f-dc26c4f2cc54/e48cca8c-4cf6-429c-ab6c-56eff92497ec'}, u'index': 0, u'iface': u'virtio', 'apparentsize': '10737418240', u'specParams': {}, u'imageID': u'a96f8b40-4e38-4ac6-a51f-dc26c4f2cc54', u'readonly': 'False', 'deviceType': u'disk', u'shared': u'false', 'truesize': '2491695104', u'type': u'disk', u'domainID': u'47bd4adb-7bd4-425d-98e3-b105f34a76a0', 'reqsize': '0', u'format': u'raw', u'deviceId': u'a96f8b40-4e38-4ac6-a51f-dc26c4f2cc54', u'address': {u'slot': u'0x05', u'bus': u'0x00', u'domain': u'0x0000', u'type': u'pci', u'function': u'0x0'}, u'device': u'disk', 'path': u'/rhev/data-center/41c0d682-de18-45cf-8f70-81471be76a99/47bd4adb-7bd4-425d-98e3-b105f34a76a0/images/a96f8b40-4e38-4ac6-a51f-dc26c4f2cc54/e48cca8c-4cf6-429c-ab6c-56eff92497ec', u'propagateErrors': u'off', u'optional': u'false', 'name': u'vda', u'bootOrder': u'1', u'volumeID': u'e48cca8c-4cf6-429c-ab6c-56eff92497ec', 'alias': u'virtio-disk0', 'volumeChain': [{'domainID': u'47bd4adb-7bd4-425d-98e3-b105f34a76a0', 'volType': 'path', 'leaseOffset': 0, 'volumeID': u'e48cca8c-4cf6-429c-ab6c-56eff92497ec', 'leasePath': u'/rhev/data-center/mnt/10.16.29.93:_ppc__ge__1__nfs__1/47bd4adb-7bd4-425d-98e3-b105f34a76a0/images/a96f8b40-4e38-4ac6-a51f-dc26c4f2cc54/e48cca8c-4cf6-429c-ab6c-56eff92497ec.lease', 'imageID': u'a96f8b40-4e38-4ac6-a51f-dc26c4f2cc54', 'path': u'/rhev/data-center/mnt/10.16.29.93:_ppc__ge__1__nfs__1/47bd4adb-7bd4-425d-98e3-b105f34a76a0/images/a96f8b40-4e38-4ac6-a51f-dc26c4f2cc54/e48cca8c-4cf6-429c-ab6c-56eff92497ec'}]}, {'device': u'usb', 'alias': u'usb', 'deviceType': 'controller', 'type': 'controller', 'address': {u'slot': u'0x02', u'bus': u'0x00', u'domain': u'0x0000', u'type': u'pci', u'function': u'0x0'}}, {'device': u'unix', 'alias': u'channel0', 'deviceType': u'channel', 'type': u'channel', 'address': {u'bus': u'0', u'controller': u'0', u'type': u'virtio-serial', u'port': u'1'}}, {'device': u'unix', 'alias': u'channel1', 'deviceType': u'channel', 'type': u'channel', 'address': {u'bus': u'0', u'controller': u'0', u'type': u'virtio-serial', u'port': u'2'}}, {u'address': {u'bus': u'0', u'controller': u'0', u'type': u'drive', u'target': u'0', u'unit': u'3'}, 'volumeInfo': {'domainID': u'2f9b37ca-b015-4c24-a89d-daddd5c7169e', 'volType': 'path', 'leaseOffset': 111149056, 'volumeID': '452e0080-f5c7-43ca-984b-eebe82ad4f09', 'leasePath': '/dev/2f9b37ca-b015-4c24-a89d-daddd5c7169e/leases', 'imageID': u'b831c495-c3e0-4986-abde-746d9f0573cf', 'path': u'/rhev/data-center/mnt/blockSD/2f9b37ca-b015-4c24-a89d-daddd5c7169e/images/b831c495-c3e0-4986-abde-746d9f0573cf/452e0080-f5c7-43ca-984b-eebe82ad4f09'}, 'index': '3', u'iface': u'scsi', 'apparentsize': '1073741824', u'specParams': {}, u'imageID': u'b831c495-c3e0-4986-abde-746d9f0573cf', u'readonly': 'False', 'deviceType': u'disk', u'shared': u'false', 'truesize': '1073741824', u'type': u'disk', u'domainID': u'2f9b37ca-b015-4c24-a89d-daddd5c7169e', 'reqsize': '0', u'format': u'cow', u'deviceId': u'b831c495-c3e0-4986-abde-746d9f0573cf', u'poolID': u'41c0d682-de18-45cf-8f70-81471be76a99', u'device': u'disk', 'path': u'/rhev/data-center/41c0d682-de18-45cf-8f70-81471be76a99/2f9b37ca-b015-4c24-a89d-daddd5c7169e/images/b831c495-c3e0-4986-abde-746d9f0573cf/452e0080-f5c7-43ca-984b-eebe82ad4f09', u'propagateErrors': u'off', u'optional': u'false', 'name': u'sdd', u'volumeID': u'452e0080-f5c7-43ca-984b-eebe82ad4f09', 'alias': u'scsi0-0-0-3', 'volumeChain': [{'domainID': u'2f9b37ca-b015-4c24-a89d-daddd5c7169e', 'volType': 'path', 'leaseOffset': 111149056, 'volumeID': '452e0080-f5c7-43ca-984b-eebe82ad4f09', 'leasePath': '/dev/2f9b37ca-b015-4c24-a89d-daddd5c7169e/leases', 'imageID': u'b831c495-c3e0-4986-abde-746d9f0573cf', 'path': u'/rhev/data-center/mnt/blockSD/2f9b37ca-b015-4c24-a89d-daddd5c7169e/images/b831c495-c3e0-4986-abde-746d9f0573cf/452e0080-f5c7-43ca-984b-eebe82ad4f09'}]}], 'clientIp': '', 'statusTime': '43051670420', u'display': 'vnc'} ============================================================================== After disk hotplug, on the guest: [root@dhcp167-130 dev]# date && lsblk Wed 25 Nov 07:48:09 EST 2015 NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 1024M 0 rom vda 252:0 0 10G 0 disk ├─vda1 252:1 0 4M 0 part ├─vda2 252:2 0 500M 0 part /boot └─vda3 252:3 0 9.5G 0 part ├─rhel_dhcp167--130-root 253:0 0 8.5G 0 lvm / └─rhel_dhcp167--130-swap 253:1 0 1G 0 lvm [SWAP] The disk is not seen by the guest Expected results: Disk hotplug should succeed. Additional info: logs from engine and host