[ovirt-users] Re: Q: Hybrid GlusterFS / local storage setup?
Hello Nir,
Thanks for the prompt answer.
On Wed, Oct 14, 2020 at 1:02 PM Nir Soffer <nsoffer(a)redhat.com> wrote:
GlusterFS?
Yep, GlusterFS. Sorry, wrong abbreviation on my end..
This will not be fast as local device passed-through to the vm
It will also be problematic, since all hosts will mount, monitor, and
maintain leases on this NFS storage, since it is considered as
shared
storage.
If another host fail to access this NFS storage the other host will be
deactivated and all the VMs will migrate to other hosts. This migration
storm can cause lot of trouble.
In the worst case, in no other host can access this NFS storage all other
hosts will be deactivated.
This is same as NFS (internally this is the same code). It will work only
if you can mount the same device/export on all hosts. This is even
worse
than NFS.
OK. Understood. No NFS / POSIXFS storage than.
> A. Am I barking at the wrong tree here? Is this setup even possible?
>
This is possible using host device.
You can attach a host device to a VM. This will pin the VM to the host,
and give best performance.
It may not be flexible enough since you need to attach entire device.
Maybe it can work with LVM logical volumes.
I've got room to spare.
Any documentation on how to achieve this (or some pointers where to look)?
I couldn't find LVM / block device under host devices / storage domain /
etc and Google search returned irrelevant results.
- Gilboa
Nir
B. If it is even possible, any documentation / pointers on setting up
> per-host private storage?
>
> I should mention that these workstations are quite beefy (64-128GB
> RAM, large MDRAID, SSD, etc) so I can spare memory / storage space (I
> can even split the local storage and GFS to different arrays).
>
> - Gilboa
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