[ovirt-users] Spurious error message when the RHEV capacity is maxed out?

[Michal Skrivanek]

On Apr 24, 2014, at 07:40 , Itamar Heim <iheim at redhat.com> wrote:

> On 04/24/2014 12:31 AM, Satya Vempati wrote:
>> We have about 900 vms in a RHEV-M 3.3 installation (3.3.2-0.50.el6ev)
>> with three hosts.
>> 
>> Each VM has 1 socket, 1 core for CPU and 256 MB memory and 2 x 1TB disks
>> + one 5 GB boot disk.
>> 
>> Each host has 2 cpu sockets with 4 cpu cores per socket.
>> 
>> When we power on about 250 of these vms, we cannot power on any more vms.
> 
> is this a 'monday morning effect' (are you trying to launch them all together)?

even that would work, we just serialize the requests so it could only take a long time...

> 
>> 
>> Attempting to do so gets the error (in the RHEV-M) console.
>> 
>> Bad volume specification {'index': 0, 'iface': 'virtio', 'reqsize': '0',
>> 'format': 'raw', 'bootOrder': '1', 'volumeID':
>> '14aa7302-7f6d-4b80-922d-3fc090695447', 'apparentsize': '5368709120',
>> 'imageID': '97b1985e-e507-4927-91e9-7393c7777de5', 'specParams': {},
>> 'readonly': 'false', 'domainID': '0c7abccc-1b97-4b39-ab96-e977a19fac3a',
>> 'optional': 'false', 'deviceId': '97b1985e-e507-4927-91e9-7393c7777de5',
>> 'truesize': '0', 'poolID': '5849b030-626e-47cb-ad90-3ce782d831b3',
>> 'device': 'disk', 'shared': 'false', 'propagateErrors': 'off', 'type':
>> 'disk'}.

check both engine and vdsm logs to identify if it's on the engine side or some trouble at the host...

Thanks,
michal


>> 
>> This looks like a spurious error, as we can power on the same VM after
>> rebooting the hosts.
>> 
>> And also, the hosts do not really look maxed out (CPU usage is around
>> 25%, memory around 50%), but no more vm’s can be powered on.
>> 
>> I was looking for a sizing guide, and found only
>> https://access.redhat.com/site/sites/default/files/attachments/rhev_sizing_0812.pdf
>> 
>> Is there any other information available?
>> 
>> 
>> 
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>