[Qemu-devel] Fwd: [libvirt] virDomainAttachDevice error during disk hotplug

[Deepak C Shetty <deepakcs@linux.vnet.ibm.com>]

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Hi List,
     Below is the mail I sent to libvirt list, but didn't get much response.
Trying here to see if someone can help provide suggestions on why 
"Invalid Argument" is recd for 
/var/run/vdsm/3333017d-1278-4bfb-8129-62bded257399
while doing the disk hotplug ?

Appreciate some response

thanx,
deepak


-------- Original Message --------
Subject: 	[libvirt] virDomainAttachDevice error during disk hotplug
Date: 	Sat, 10 Aug 2013 17:38:20 +0530
From: 	Deepak C Shetty <deepakcs@linux.vnet.ibm.com>
Organization: 	IBM India Pvt. Ltd.
To: 	libvir-list@redhat.com



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


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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