Hello Sebastian,
you missed a bit from the paragraph
Important: All communication to the storage domain is through the selected host
and not directly from the oVirt Engine. At least one active host must exist in
the system and be attached to the chosen data center. All hosts must have
access to the storage device before the storage domain can be configured.
Regards,
Paul S.
________________________________________
From: [email protected] <[email protected]>
Sent: 28 March 2019 16:42
To: [email protected]
Subject: [ovirt-users] Is iSCSI performance better for VMs on the selected Host?
Hi all,
I am planning to add block storage (iSCSI) to my oVirt environment. I just
stumbled across this point from the oVirt Documentation:
"6. Select an active host in the Use Host field. If this is not the first data
domain in a data center, you must select the data center's SPM host. Important:
All communication to the storage domain is through the selected host and not
directly from the oVirt Engine." (you find it here:
https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ovirt.org%2Fdocumentation%2Fadmin-guide%2Fchap-Storage.html%23adding-block-storage&data=02%7C01%7Cp.staniforth%40leedsbeckett.ac.uk%7C5154ca0f6519416ca99d08d6b39c7093%7Cd79a81124fbe417aa112cd0fb490d85c%7C0%7C0%7C636893881813582846&sdata=jHsJdA6i4Zg5%2BpzrVmqGRfvHKnn9%2FFw9P23dGLpPpwQ%3D&reserved=0)
So my question is: Is there a significant performance advantage for VMs using
the storage that are running on that "selected host"? Because if this is the
case, I would connect all my host machines to the dedicated storage network,
create multiple data domains and "split" my iSCSI storage server(s) among those
domains. If it is not the case, I would only have my storage server(s) and one
of my hosts in the storage network. This also has implications on the
dimensions (and cost!) of the switch that I use for the storage network, so I
would be grateful if someone has any insight.
Thanks
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