Re: [libvirt-users] concurrent migration of several domains rarely fails
Jim wrote:
>
> What is meant by the "admin interface" ? virsh ?
virsh-admin, which you can use to change some admin settings of libvirtd, e.g.
log_level. You are interested in the keepalive settings above those ones in
libvirtd.conf, specifically
#keepalive_interval = 5
#keepalive_count = 5
> What is meant by "client" in libvirtd.conf ? virsh ?
Yes, virsh is a client, as is virt-manager or any application connecting to
libvirtd.
> Why do i have regular timeouts although my two hosts are very performant ? 128GB
> RAM, 16 cores, 2 1GBit/s network adapter on each host in bonding.
> During migration i don't see much load, although nearly no waiting for IO.
I'd think concurrently migrating 3 VMs on a 1G network might cause some
congestion :-).
> Should i set admin_keepalive_interval to -1 ?
You should try 'keepalive_interval = -1'. You can also avoid sending keepalive
messages from virsh with the '-k' option, e.g. 'virsh -k 0 migrate ...'.
If this doesn't help, are you in a position to test a newer libvirt, preferably
master or the recent 4.10.0 release?
Hi Jim,
Unfortunately not.
I have some more questions, maybe you can help me a bit.
I found http://epic-alfa.kavli.tudelft.nl/share/doc/libvirt-devel-0.10.2/migratio... ,
which is
quite interesting.
When i migrate with virsh, i use:
virsh --connect=qemu:///system migrate --verbose --live domain
qemu+ssh://ha-idg-1/system
When pacemaker migrates, it creates this sequence:
virsh --connect=qemu:///system --quiet migrate --live domain qemu+ssh://ha-idg-1/system
which is quite the same.
Do i understand the webpage correctly, is this a "Native migration, client to two
libvirtd servers" ?
Furthermore the document says:
"To force migration over an alternate network interface the optional hypervisor
specific URI must be provided".
I have both hosts also connected directly to each other with a bonding device using
round-robin, and an internal ip (192.168.100.xx).
When i want to use this device, which is maybe a bit faster and more secure (directly
connected), how do i have to specify that ?
virsh --connect=qemu:///system --quiet migrate --live domain qemu+ssh://ha-idg-1/system
tcp://192.168.100.xx
Does it have to be the ip from the source or the destination ? Does the source then use
automatically use
also its device with 192.168.100.xx ?
Thanks.
Bernd
Helmholtz Zentrum Muenchen
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