<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>Soheil,</p>
<p>I took the liberty to add the openstack distribution list back
in.</p>
<p>Your description is a bit vague. Do you have dedicated nodes for
storage, or do you run instances on the same nodes where storage
is configured? Do you want run use volumes for instance storage,
or ephemeral disks?<br>
</p>
<p>Volumes are normally located on remote servers or disk arrays, so
that the answer is yes in this case. You can even pool storage of
several nodes together using DRBD or (up to Newton) GlusterFS, but
I have no experience in this area and can't tell you what would
work and what would not.</p>
<p>To configure volume backends, see
<a class="moz-txt-link-freetext" href="https://docs.openstack.org/cinder/rocky/configuration/block-storage/volume-drivers.html">https://docs.openstack.org/cinder/rocky/configuration/block-storage/volume-drivers.html</a>.</p>
<p>Ephemeral storage is normally local storage on the compute node
where the instance runs. You can also use NFS-mounted remote
filesystem for ephemeral storage. <br>
</p>
<p>Bernd.<br>
</p>
<div class="moz-cite-prefix">On 11/13/2018 5:37 PM, Soheil
Pourbafrani wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAK+CV0N73O4+baZ2cvsVLUeCfV9=VQ=VJwZOLO_okTK_un06Sw@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Thanks all,
<div><br>
</div>
<div>Suppose we use HDD disks of local machines and there are no
shared storages like SAN storage. So in such an environment is
it possible to use remote disks on other machines for compute
nodes? (I think it's impossible with HDD local disks and for
such a scenario we should have SAN storage).</div>
<div><br>
</div>
<div>So the question is is it possible to have volumes in local
disk of compute nodes? or we should let OpenStack go!</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Mon, Nov 12, 2018 at 6:31 PM Bernd Bausch <<a
href="mailto:berndbausch@gmail.com" moz-do-not-send="true">berndbausch@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">OpenStack
stores volumes wherever you configure it to store them. On a <br>
disk array, an NFS server, a Ceph cluster, a dedicated storage
node, a <br>
controller or even a compute node. And more.<br>
<br>
My guess: Volumes on controllers or compute nodes are not a
good <br>
solution for production systems.<br>
<br>
By default, Packstack implements Cinder volumes as LVM volumes
on the <br>
controller. It's probably possible to put the LVM volumes on
other <br>
nodes, and it is definitely possible to configure a different
backend <br>
than LVM, for example Netapp, in which case the volumes would
be on a <br>
Netapp appliance.<br>
<br>
On 11/12/2018 9:34 PM, Soheil Pourbafrani wrote:<br>
> My question is does OpenStack store volumes somewhere
other than <br>
> the compute node?<br>
> For example in PackStack on two nodes, one for controller
and network <br>
> and the other for compute node, the instance's volumes
will be stored <br>
> on the controller or on compute?<br>
<br>
</blockquote>
</div>
</blockquote>
</body>
</html>