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

[Deepak C Shetty]

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 <address@hidden>
Organization:	IBM India Pvt. Ltd.
To:	address@hidden

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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