[libvirt] virDomainAttachDevice error during disk hotplug

Sat Aug 10 12:50:39 UTC 2013

On 08/10/2013 05:38 PM, Deepak C Shetty wrote:
> Hi All,
>     I am trying to do a hotplug of a disk from VDSM (which uses 
> libvirt to get things done).
> I hit the below error "operation failed: open disk image file failed" 
> comign from virDomainAttachDevice.
>
> Some background:
>
> 1) The qemu-img create  cmd I use (inside vdsm) to create the file 
> being hotplugged is
>
> /usr/bin/qemu-img create -f qcow2 -F qcow2 -b 
> /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 
> /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399' (cwd /var/run/vdsm)
>
> I even tried using the rel. backing path instead of abs. path as below..
>
> /usr/bin/qemu-img create -f qcow2 -F qcow2 -b 
> ../../../rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 
> /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399' (cwd /var/run/vdsm)
>
> but hit the same error during hotplug operation
>
> 2) qemu-img info /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399
> image: /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399
> file format: qcow2
> virtual size: 3.8G (4096000000 bytes)
> disk size: 196K
> cluster_size: 65536
> backing file: 
> /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399
> backing file format: qcow2
>
> 3) ls -l 
> /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399
> -r--r-----. 1 vdsm kvm 197120 Aug 10 11:59 
> /rhev/data-center/000065de-04b8-42e2-986c-2de664708be7/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399
>

The above is the backing file path listing.
Adding the file-to-be-hotplugged path listing below.

ls -l /var/run/vdsm/
total 216
-rw-rw----. 1 vdsm kvm  197120 Aug 10 12:00 
3333017d-1278-4bfb-8129-62bded257399

It has the right rw perms....but still I see "open disk image file 
failed" error

thanx,
deepak

>
> 4) libvirtd.log snippets:
>
> 2013-08-10 11:19:41.766+0000: 1103: debug : virDomainAttachDevice:9820 
> : dom=0x7f92f4003f20, (VM: name=dpk_BR_vm, 
> uuid=9999017d-1278-4bfb-8129-62bded257399), xml=<disk device="disk" 
> snapshot="no" type="file">
>         <source 
> file="/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399"/>
>         <target bus="virtio" dev="vdb"/>
> <serial>22224c45-6504-4ea1-bd24-12340017dd32</serial>
>         <driver cache="none" error_policy="stop" io="threads" 
> name="qemu" type="qcow2"/>
> </disk>
>
> 2013-08-10 11:19:41.766+0000: 1103: debug : 
> qemuDomainObjBeginJobInternal:958 : Starting job: modify (async=none)
> 2013-08-10 11:19:41.766+0000: 1103: debug : 
> virStorageFileGetMetadata:1007 : 
> path=/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399 format=9 
> uid=107 gid=107 probe=0
> 2013-08-10 11:19:41.766+0000: 1103: debug : 
> virStorageFileGetMetadataRecurse:939 : 
> path=/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399 format=9 
> uid=107 gid=107 probe=0
> 2013-08-10 11:19:41.767+0000: 1103: debug : 
> virStorageFileGetMetadataInternal:687 : 
> path=/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399, fd=25, format=9
> 2013-08-10 11:19:41.770+0000: 1103: debug : 
> virStorageFileGetMetadataRecurse:939 : 
> path=/home/dpkshetty/libSM_disk/localstoragedomain/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399 
> format=9 uid=107 gid=107 probe=0
> 2013-08-10 11:19:41.770+0000: 1103: debug : 
> virStorageFileGetMetadataInternal:687 : 
> path=/home/dpkshetty/libSM_disk/localstoragedomain/11112d24-4cda-4200-8f6d-a1d8362c70fd/images/22224c45-6504-4ea1-bd24-12340017dd32/3333017d-1278-4bfb-8129-62bded257399, 
> fd=25, format=9
> 2013-08-10 11:19:41.770+0000: 1103: debug : 
> qemuDomainPCIAddressGetNextSlot:1826 : Found free PCI slot 0000:00:05
> 2013-08-10 11:19:41.770+0000: 1103: debug : 
> qemuDomainPCIAddressReserveSlot:1710 : Reserving PCI slot 0000:00:05.0
> 2013-08-10 11:19:41.770+0000: 1103: debug : qemuMonitorAddDrive:2756 : 
> mon=0x7f92f0007830 
> drive=file=/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399,if=none,id=drive-virtio-disk1,format=qcow2,serial=22224c45-6504-4ea1-bd24-12340017dd32,cache=none,werror=stop,rerror=stop,aio=threads
> 2013-08-10 11:19:41.770+0000: 1103: debug : qemuMonitorSend:887 : 
> QEMU_MONITOR_SEND_MSG: mon=0x7f92f0007830 
> msg={"execute":"human-monitor-command","arguments":{"command-line":"drive_add 
> dummy 
> file=/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399,if=none,id=drive-virtio-disk1,format=qcow2,serial=22224c45-6504-4ea1-bd24-12340017dd32,cache=none,werror=stop,rerror=stop,aio=threads"},"id":"libvirt-67"}^M
>  fd=-1
> 2013-08-10 11:19:41.771+0000: 1091: debug : qemuMonitorIOWrite:453 : 
> QEMU_MONITOR_IO_WRITE: mon=0x7f92f0007830 
> buf={"execute":"human-monitor-command","arguments":{"command-line":"drive_add 
> dummy 
> file=/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399,if=none,id=drive-virtio-disk1,format=qcow2,serial=22224c45-6504-4ea1-bd24-12340017dd32,cache=none,werror=stop,rerror=stop,aio=threads"},"id":"libvirt-67"}^M
>  len=292 ret=292 errno=11
> 2013-08-10 11:19:41.772+0000: 1091: debug : qemuMonitorIOProcess:345 : 
> QEMU_MONITOR_IO_PROCESS: mon=0x7f92f0007830 buf={"return": "could not 
> open disk image /var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399: 
> Invalid argument\r\n", "id": "libvirt-67"}^M
>  len=134
> 2013-08-10 11:19:41.772+0000: 1103: error : 
> qemuMonitorTextAddDrive:2697 : operation failed: open disk image file 
> failed
> 2013-08-10 11:19:41.773+0000: 1103: debug : qemuDomainObjEndJob:1070 : 
> Stopping job: modify (async=none)
>
> ---------------
>
>
> Any hints on what could be the issues will help. I can try out few 
> things, if someone could provide suggestions.
>
> thanx,
> deepak
>
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