[Gluster-users] gluster and qcow2 images

[Alex K]

Hi

On Fri, Jun 28, 2019, 17:54 Marcus Schopen <lists at localguru.de> wrote:

> Hi,
>
> does anyone have experience with gluster in KVM environments? I would
> like to hold qcow2 images of a KVM host with a second KVM host in sync.
> Unfortunately, shared storage is not available to me, only the
> two KVM hosts. In principle, it would be sufficient for me - in case of
> a failure of the first KVM host - to start the guests on the second
> host by hand without restoring the images from the nightly backup
> first. The question is, is glusterfs a sensible solution here or
> should one better use other approaches e.g. DRBD. I have read
> contradictory statements about this, many advise against using gluster
> for qcow2 images, some report no problems at all.
>
Redhat uses gluster in its RHEV solution. Ovirt is the open source one.
Thus gluster can be used with good results. You will need a 10G network for
the gluster storage for higher performance and enable sharding on the
shared volume. Two node setups are prone to split brain issues which may
cause headaches. I am running such setups for years and encountered few
splits which i was able to recover from. You need some fencing solution
inplace to minimize such issues. I would expect higher performance from
DRBD, though I am not aware of any GUI solution that simplifies its
management.

>
> Cheers
> Marcus
>
>
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