[ovirt-users] Local and Shared storage in same datacenter

Barak Korren bkorren at redhat.com
Sun Oct 30 10:19:24 UTC 2016

> While I understand that this makes having local storage impossible, I
> believe there is a use case to have local storage in a shared storage
> datacenter.
> Consider the following:
> I have a few applications that require 1 milli second latency and at most 2
> milli second.
> That is not consistenly achievable with shared storage, to that end I added
> flash storage to a few hypervisors.
> About 5% of my servers require this and are not that resource hungry to
> require a dedicated physical server.
> That same 5% also has no requirement to be migrated if a host fails.

I mentioned this in another thread already, please look into the VDSM
scratchpad hook. It will allow you to attach (files on) the local SSDs
(as disks) to VMs when those VMs start up. It will perfectly meet your
use case if you only need to keep the data on the SSD while the VM is

Barak Korren
bkorren at redhat.com

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