[ovirt-users] Re: oVirt Storage questions
On Sat, Jan 5, 2019 at 8:12 AM <michael(a)wanderingmad.com> wrote:
From previous thread about gluster issues, things seem to be running much better than
before, and it has raised a few questions that I can't seem to find any answers to:
Setup:
3 hyperconverged nodes
each node has 1x 1tb SSD and 1x 500gb nVME drive
each node is connected via ethernet and also by a 40gb infiniband connection for the
gluster replication.
Questions:
1. I created a 3tb VDO drive on the SSD and a 1.3tb VDO Drive on the nVME drive with a
1Gb cache on each server and I enabled the RDMA transport.
a. Did I lose anything by doing the whole process manually? Since I did it like
that, things seem to run MUCH better so far, rebooting nodes the gluster resyncs almost
instantly and storage seems faster also.
By manual process - I assume you did not use the Cockpit UI to create
the bricks and gluster volumes? You should review the volume options
that are set.
b. Is there a way to split out the gluster traffic from the
normal ovirt traffic (VM and cluster communication)? originally I had separate names for
each node for the gluster network and it WAS split, but if I ever reset a gluster node,
the name got changed. What I did now is just put in a hosts file on each node that sends
all traffic over the infiniband, but I don't feel like that's optimal. I was
unable to add in the separate gluster names in the configuration as they were not part of
the existing cluster.
You can split the gluster traffic by using a different address (of
gluster network) to peer probe the gluster servers. And use the
ovirtmgmt interface to add the hosts to engine.
c. Why does the hyper-connverged wizard not let you adjust the
VDO cache size, the transport type, or use VDO to "over-subscribe" the drive
sizes like I did manually?
This is a bug which we are tracking to fix in 4.3.
2. I wanted to add more space in the near future, would it be better
to create a RAID0 with the new drives, or just use them as another separate storage
location?
Both are valid options. creating new volume would mean that you may
have to move some of the vdisks to the newly created volume to free up
space.
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