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.
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'}.
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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