[one-users] slow live migration of VM's

[Ionut Popovici]

1st20- 60Gb disk .. is preaty much ..
2nd transfer is done via SCP that si a lil slower than any other 
transfer but is more safer.
3nd It depends on READ on the host where are the VMS .. if they have 
other host working .. keep in mind that the machine share the IO of that 
datastore. On perfect Datastone it sould be around 6ms time to access 
data on HDD .. but on live datastore it my take a lil more.
My test was starting nonpersistent image with size 50GB on a SSD drive 
it took around 4Mins and was not lunch via network, just copy via scp .. 
on same drive.
On 11/25/2013 4:32 AM, Gary S. Cuozzo wrote:
> Hi all,
> I was just moving some VM's around as a prep for some server 
> maintenance, via live migration.  I moved 3 VM's which were all fairly 
> small in size of 1GB - 3GB RAM and 20GB - 60GB disk.  I did the 
> migrations 1 at a time.  I was surprised at how long the migrations 
> took and also that each VM was pretty much unusable during the 
> migration.  SSH sessions timed out and websites were not able to be 
> accessed.  A VM with 3GB RAM allocation took around 10 minutes to migrate.
>
> Is this typical?  Or do I maybe have some sort of issue on my network 
> or config?  We run a dedicated 1000Mbps management network for this 
> type of thing, and all data storage access is via separate 4x 1000Mbps 
> bonded channels.  I would have expected 3GB of RAM data to be pretty 
> quick.  Probably < 1 min.
>
> Are there any settings in ONE that should be tuned?  I don't seem to 
> recall having an issue with migrations when I was just running 
> virt-manager/libvirt directly.
>
> The last VM I have to move is a pretty important one and it has 24GB 
> RAM allocated.  So I think it would be easier/quicker to just shut the 
> VM down, disable the host for maintenance, and redeploy it.  I'm 
> hoping to avoid that.
>
> Thanks for any advice,
> gary
>
>
>
>
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