[libvirt-users] 答复: virtual drive performance

2017-07-02 Thread 王李明 
mybe this is because you physic host memory is small

then this will Causing instability of the virtual machine

But I'm just guessing

You can try to increase your memory

 

 

Wang Liming

 

 

发件人: libvirt-users-boun...@redhat.com [mailto:libvirt-users-boun...@redhat.com] 
代表 Dominik Psenner
发送时间: 2017年7月2日 16:22
收件人: libvirt-users@redhat.com
主题: Re: [libvirt-users] virtual drive performance

 

Hi again,

just today an issue I've thought to be resolved popped up again. We backup the 
machine by doing:

virsh snapshot-create-as --domain domain --name backup --no-metadata --atomic 
--disk-only --diskspec hda,snapshot=external

# backup hda.qcow2

virsh blockcommit domain hda --active --pivot

Every now and then this process fails with the following error message:

error: failed to pivot job for disk hda
error: block copy still active: disk 'hda' not ready for pivot yet
Could not merge changes for disk hda of domain. VM may be in invalid state.

I expect live backups are a great asset and should work. Is this a bug that may 
relates also to the virtual drive performance issues we observe?

Cheers

 

2017-07-02 10:10 GMT+02:00 Dominik Psenner :

Hi

a small update on this. I just migrated the vm from the site to my laptop and 
fired it up. The exact same xml configuration (except file paths and such) 
starts up and bursts with 50Mb/s to 115Mb/s in the guest. This allows only one 
reasonable answer: the cpu on my laptop is somehow better suited to emulate IO 
than the CPU built into the host on site. The host there is a HP proliant 
microserver gen8 with xeon processor. But the processor there is also never 
capped at 100% when the guest copies files.

I just ran another test by copying a 3Gb large file on the guest. What I can 
observe on my computer is that the copy process is not at a constant rate but 
rather starts with 90Mb/s, then drops down to 30Mb/s, goes up to 70Mb/s, drops 
down to 1Mb/s, goes up to 75Mb/s, drops to 1Mb/s, goes up to 55Mb/s and the 
pattern continues. Please note that the drive is still configured as:



and I would expect a constant rate that is either high or low since there is no 
caching involved and the underlying hard drive is a samsung ssd evo 850. To 
have an idea how fast that drive is on my laptop:

$ dd if=/dev/zero of=testfile bs=1M count=1000 oflag=direct
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 2.47301 s, 424 MB/s

 

I can further observe that the smaller the saved chunks are the slower the 
overall performance is:

dd if=/dev/zero of=testfile bs=512K count=1000 oflag=direct
1000+0 records in
1000+0 records out
524288000 bytes (524 MB, 500 MiB) copied, 1.34874 s, 389 MB/s

$ dd if=/dev/zero of=testfile bs=5K count=1000 oflag=direct
1000+0 records in
1000+0 records out
512 bytes (5.1 MB, 4.9 MiB) copied, 0.105109 s, 48.7 MB/s

$ dd if=/dev/zero of=testfile bs=1K count=1 oflag=direct
1+0 records in
1+0 records out
1024 bytes (10 MB, 9.8 MiB) copied, 0.668438 s, 15.3 MB/s

$ dd if=/dev/zero of=testfile bs=512 count=2 oflag=direct
2+0 records in
2+0 records out
1024 bytes (10 MB, 9.8 MiB) copied, 1.10964 s, 9.2 MB/s

Could this be a limiting factor? Does qemu/kvm do many many writes of just a 
few bytes?


Ideas, anyone?

Cheers

 

2017-06-21 20:46 GMT+02:00 Dan :

On Tue, Jun 20, 2017 at 04:24:32PM +0200, Gianluca Cecchi wrote:
> On Tue, Jun 20, 2017 at 3:38 PM, Dominik Psenner  wrote:
>
> >
> > to the following:
> >
> > 
> >   
> >   
> >   
> >   
> >   
> > 
> >
> > Do you see any gotchas in this configuration that could prevent the
> > virtualized guest to power on and boot up?
> >
> >
> When I configure like this, from a linux guest point of view I get this
> Symbios Logic SCSI Controller:
> 00:08.0 SCSI storage controller: LSI Logic / Symbios Logic 53c895a
>
> But htis is true only if you add the SCSI controller too, not only the disk
> definition.
> In my case
>
> 
>function='0x0'/>
> 
>
> Note the slot='0x08' that is reflected into the first field of lspci inside
> my linux guest.
> So between your controllers you have to add the SCSI one
>
> In my case (Fedora 25 with virt-manager-1.4.1-2.fc25.noarch,
> qemu-kvm-2.7.1-6.fc25.x86_64, libvirt-2.2.1-2.fc25.x86_64) with "Disk bus"
> set as SCSI in virt-manager, the xml defintiion for the guest is
> automatically updated with the controller if not existent yet.
> And the disk definition sections is like this:
>
> 
>   
>   
>   
>   
>   
> 
>
> So I think you should set dev='sda' and not 'hda' in your xml for it
>

I am actually very curious to know if that would make a difference. I
don't have a such windows vm images ready to test at present.

Dan
> I don't kknow if w2016 contains the symbios logic drivers already
> installed, so that a "simple" reboot could imply an automatic
> reconfiguration of the guest
> Note also that

[libvirt-users] 答复: 答复: Virsh command hanging

2017-02-21 Thread 王李明 
I don't know whether this is a bug

because I have tried a lot of method to soluted this problem

but I alway failed

at last I have to upgrade our os version 

 

发件人: abhishek jain [mailto:abhish_j...@yahoo.com] 
发送时间: 2017年2月21日 21:33
收件人: 王李明; libvirt-users@redhat.com
主题: Re: 答复: [libvirt-users] Virsh command hanging

 

I can only use RHEL6.

 

Is it a bug in libvirt ??

 

Regards

Abhishek

 

  _  

From: 王李明 <wan...@certusnet.com.cn>
To: 'abhishek jain' <abhish_j...@yahoo.com>; libvirt-users@redhat.com 
Sent: Tuesday, 21 February 2017 11:54 AM
Subject: 答复: [libvirt-users] Virsh command hanging

 

I have this problem in centos6.5

when I upgrade to centos 7.1 this problem is soluted

maybe you can upgrade your os version

 

 

 

发件人: libvirt-users-boun...@redhat.com [mailto:libvirt-users-boun...@redhat.com] 
代表 abhishek jain
发送时间: 2017年2月21日 13:51
收件人: libvirt-users@redhat.com
主题: [libvirt-users] Virsh command hanging

 

Hi,

 

I started the VMs with libvirt 3 days ago (17th Feb).  Now when I am trying to 
shutdown the domain, all my virsh command is hanging even  virt-manager remains 
in "connecting.."  mode and is not showing active domains.

When   I set  the libvirt debug env and call "virsh list"  it hangs in poll. 
Here is the log

setenv LIBVIRT_DEBUG 1 virsh list

2017-02-21 05:31:09.241+: 125812: debug : virEventPollCalculateTimeout:320 
: Calculate expiry of 0 timers

2017-02-21 05:31:09.241+: 125811: debug : virEventPollUpdateHandle:146 : 
EVENT_POLL_UPDATE_HANDLE: watch=2 events=0

2017-02-21 05:31:09.241+: 125812: debug : virEventPollCalculateTimeout:346 
: Timeout at 0 due in -1 ms

2017-02-21 05:31:09.241+: 125812: debug : virEventPollRunOnce:614 : 
EVENT_POLL_RUN: nhandles=2 timeout=-1

2017-02-21 05:31:09.241+: 125811: debug : virEventPollInterruptLocked:701 : 
Interrupting

2017-02-21 05:31:09.241+: 125812: debug : virEventPollRunOnce:625 : Poll 
got 1 event(s)

2017-02-21 05:31:09.242+: 125812: debug : virEventPollDispatchTimeouts:410 
: Dispatch 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollDispatchHandles:455 : 
Dispatch 2

2017-02-21 05:31:09.242+: 125812: debug : virEventPollDispatchHandles:469 : 
i=0 w=1

2017-02-21 05:31:09.242+: 125812: debug : virEventPollDispatchHandles:483 : 
EVENT_POLL_DISPATCH_HANDLE: watch=1 events=1

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupTimeouts:501 : 
Cleanup 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupTimeouts:537 : 
Found 0 out of 0 timeout slots used, releasing 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupHandles:549 : 
Cleanup 2

2017-02-21 05:31:09.242+: 125812: debug : virEventRunDefaultImpl:244 : 
running default event implementation

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupTimeouts:501 : 
Cleanup 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupTimeouts:537 : 
Found 0 out of 0 timeout slots used, releasing 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupHandles:549 : 
Cleanup 2

2017-02-21 05:31:09.242+: 125812: debug : virEventPollMakePollFDs:378 : 
Prepare n=0 w=1, f=4 e=1 d=0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollMakePollFDs:378 : 
Prepare n=1 w=2, f=6 e=0 d=0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCalculateTimeout:320 
: Calculate expiry of 0 timers

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCalculateTimeout:346 
: Timeout at 0 due in -1 ms

2017-02-21 05:31:09.242+: 125812: debug : virEventPollRunOnce:614 : 
EVENT_POLL_RUN: nhandles=1 timeout=-1 <>

 

 

here is the log snippet of  /var/log/libvirt/libvirtd.log

2017-02-17 06:18:26.198+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:18:41.022+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:18:56.017+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:19:11.019+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:19:26.016+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:19:41.021+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:19:56.014+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:20:11.021+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:20:26.014+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:20:41.014+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:20:56.016+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:21:11.019+: 5052: error :

[libvirt-users] 答复: Virsh command hanging

2017-02-20 Thread 王李明 
I have this problem in centos6.5

when I upgrade to centos 7.1 this problem is soluted

maybe you can upgrade your os version

 

 

 

发件人: libvirt-users-boun...@redhat.com [mailto:libvirt-users-boun...@redhat.com] 
代表 abhishek jain
发送时间: 2017年2月21日 13:51
收件人: libvirt-users@redhat.com
主题: [libvirt-users] Virsh command hanging

 

Hi,

 

I started the VMs with libvirt 3 days ago (17th Feb).  Now when I am trying to 
shutdown the domain, all my virsh command is hanging even  virt-manager remains 
in "connecting.."  mode and is not showing active domains.

When   I set  the libvirt debug env and call "virsh list"  it hangs in poll. 
Here is the log

setenv LIBVIRT_DEBUG 1 virsh list

2017-02-21 05:31:09.241+: 125812: debug : virEventPollCalculateTimeout:320 
: Calculate expiry of 0 timers

2017-02-21 05:31:09.241+: 125811: debug : virEventPollUpdateHandle:146 : 
EVENT_POLL_UPDATE_HANDLE: watch=2 events=0

2017-02-21 05:31:09.241+: 125812: debug : virEventPollCalculateTimeout:346 
: Timeout at 0 due in -1 ms

2017-02-21 05:31:09.241+: 125812: debug : virEventPollRunOnce:614 : 
EVENT_POLL_RUN: nhandles=2 timeout=-1

2017-02-21 05:31:09.241+: 125811: debug : virEventPollInterruptLocked:701 : 
Interrupting

2017-02-21 05:31:09.241+: 125812: debug : virEventPollRunOnce:625 : Poll 
got 1 event(s)

2017-02-21 05:31:09.242+: 125812: debug : virEventPollDispatchTimeouts:410 
: Dispatch 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollDispatchHandles:455 : 
Dispatch 2

2017-02-21 05:31:09.242+: 125812: debug : virEventPollDispatchHandles:469 : 
i=0 w=1

2017-02-21 05:31:09.242+: 125812: debug : virEventPollDispatchHandles:483 : 
EVENT_POLL_DISPATCH_HANDLE: watch=1 events=1

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupTimeouts:501 : 
Cleanup 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupTimeouts:537 : 
Found 0 out of 0 timeout slots used, releasing 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupHandles:549 : 
Cleanup 2

2017-02-21 05:31:09.242+: 125812: debug : virEventRunDefaultImpl:244 : 
running default event implementation

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupTimeouts:501 : 
Cleanup 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupTimeouts:537 : 
Found 0 out of 0 timeout slots used, releasing 0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCleanupHandles:549 : 
Cleanup 2

2017-02-21 05:31:09.242+: 125812: debug : virEventPollMakePollFDs:378 : 
Prepare n=0 w=1, f=4 e=1 d=0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollMakePollFDs:378 : 
Prepare n=1 w=2, f=6 e=0 d=0

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCalculateTimeout:320 
: Calculate expiry of 0 timers

2017-02-21 05:31:09.242+: 125812: debug : virEventPollCalculateTimeout:346 
: Timeout at 0 due in -1 ms

2017-02-21 05:31:09.242+: 125812: debug : virEventPollRunOnce:614 : 
EVENT_POLL_RUN: nhandles=1 timeout=-1 <>

 

 

here is the log snippet of  /var/log/libvirt/libvirtd.log

2017-02-17 06:18:26.198+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:18:41.022+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:18:56.017+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:19:11.019+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:19:26.016+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:19:41.021+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:19:56.014+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:20:11.021+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:20:26.014+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:20:41.014+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:20:56.016+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:21:11.019+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:21:26.018+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:21:41.022+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:21:56.019+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:22:11.020+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-17 06:22:26.012+: 5052: error : daemonStreamHandleAbort:609 : 
stream aborted at client request

2017-02-18 01:53:36.308+: 5052: warning :

[libvirt-users] centos6.5 libvirt 1.2.14 virsh hang

2016-01-08 Thread 王李明 
hi all：

 my environment is centos6.5 

libvirt version is 1.2.14-1

qemu version is 1.7.0-1

 

I use openstack create a  windows guest 

about two days later I run virsh list but the the process is hang 

virsh list can not return any thing 

it hang  

look like this：

 

 

then I run  /etc/init.d/libvirtd restart

it show libivrtd stop faild and start failed

 

i will use the gdb and find the gdb can not print any process stack look
like this：



 

I run /etc/init.d/libvirtd status it show libvired dead but subsys locked 

 

who can help me ?

thans

 

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[libvirt-users] centos6.5 libvirt 1.2.14 virsh hang

2015-12-21 Thread 王李明 
hi all：

 my environment is centos6.5 

libvirt version is 1.2.14-1

qemu version is 1.7.0-1

 

I use openstack create a  windows guest 

about two days later I run virsh list but the the process is hang 

virsh list can not return any thing 

it hang 

 

then I run  /etc/init.d/libvirtd restart

it show libivrtd stop faild and start failed

 

I run /etc/init.d/libvirtd status it show libvired dead but subsys locked 

 

who can help me ?

thans

 

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