11:57 p.m.
Hi Eric-
Glad you got thought that part. I don’t use iscsi backed volumes for my gluster storage,
so I don’t much advice for you there. I’ve cc’d the ovirt users list back in, someone
there may be able to help you futher. It’s good practice to reply to the list and specific
people when conversing here, so you might want to watch to be sure you don’t drop the cc:
in the future.
Re: the storage master, it’s not related to where the VM disks are stored. Once you mange
to get a new storage domain setup, you’ll be able to create disks on whichever domain you
want, and that is how you determine what VM disk is hooked up to what. You can even have a
VM with disks on multiple storage domains, can be good for high performance needs. The SDM
may even move around if a domain become unavailable. You may want to check the list
archives for discussion on this, I seem to recall some in the past. You also should
confirm where the disks for your HA engine are located, they may be on your local raid
disk instead of the iscsi disks if the SDM is on a local disk…
Good luck,
-Darrell
On Feb 14, 2020, at 3:03 PM, <eevans(a)digitaldatatechs.com>
<eevans(a)digitaldatatechs.com> wrote:
I enabled gluster and reinstalled and all went well. I set it for distributed replication
so I need 3 nodes. I migrated the rest of my vm's and I am installing the third node
shortly.
My biggest concern is getting the storage master on the lun it was previously set to. I
get the snapshots on it so I can recover from disaster more easily.
I need it to persistently be on the lun I designate.
Also, I want the luns to be the gluster replication volumes but ther is no mount point in
fstab on the machines.
I am new to gluster as well so please be patient with me.
Eric Evans
Digital Data Services LLC.
304.660.9080
-----Original Message-----
From: Darrell Budic <budic(a)onholyground.com>
Sent: Friday, February 14, 2020 2:58 PM
To: eevans(a)digitaldatatechs.com
Subject: Re: [ovirt-users] Re: glusterfs
You don’t even need to clean everything out, unless you need to destroy your old storage
to the create new gluster backing bricks. Ovirt has a feature to migrate date between
storage domains you can use to move an existing VM disk to a different storage facility.
Note that “reinstall” is an option on the Installation menu for hosts, you do not need to
remove the host first. It will pretty much just add the vdsm-gluster components in this
case, safe to use. Just put it in maintenance first.
You can certainly start fresh in the manner you describe if you want.
> On Feb 14, 2020, at 11:56 AM, <eevans(a)digitaldatatechs.com>
<eevans(a)digitaldatatechs.com> wrote:
>
> I have already imported a few vm's to see how the import process would go. So, I
remove vm's and the current storage domains, and the hosts, then add gluster on the
main ovirt node, then add the hosts back, storage back and reimport vm's?
> I want to make sure before I get started. My first go around with Ovirt and want to
make sure before I change anything.
>
> Eric Evans
> Digital Data Services LLC.
> 304.660.9080
>
>
> -----Original Message-----
> From: Darrell Budic <budic(a)onholyground.com>
> Sent: Friday, February 14, 2020 11:54 AM
> To: eevans(a)digitaldatatechs.com
> Cc: users(a)ovirt.org
> Subject: [ovirt-users] Re: glusterfs
>
> You can add it in to a running ovirt cluster, it just isn’t as automatic. First you
need to enable Gluster in at the cluster settings level for a new or existing cluster.
Then either install/reinstall your nodes, or install gluster manually and add vdsm-gluster
packages. You can create a stand alone gluster server set this way, you don’t need any
vddm packages, but then you have to create volumes manually. Once you’ve got that done,
you can create bricks and volumes in the GUI or by hand, and then add a new storage domain
and start using it. There may be ansible for some of this, but I haven’t done it in a
while and am not sure what’s available there.
>
> -Darrell
>
>> On Feb 14, 2020, at 8:22 AM, eevans(a)digitaldatatechs.com wrote:
>>
>> I currently have 3 nodes, one is the engine node and 2 Centos 7 hosts, and I plan
to add another Centos 7 KVM host once I get all the vm's migrated. I have san storage
plus the raid 5 internal disks. All OS are installed on mirrored SAS raid 1. I want to use
the raid 5 vd's as exports, ISO and use the 4TB iscsi for the vm's to run on. The
iscsi has snapshots hourly and over write weekly.
>> So here is my question: I want to add glusterfs, but after further reading, that
should have been done in the initial setup. I am not new to Linux, but new to Ovirt and
need to know if I can implement glusterfs now or if it's a start from scratch
situation. I really don't want to start over but would like the redundancy.
>> Any advice is appreciated.
>> Eric
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