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<p>Hi, we've had several issues, mainly very slow recovery(on
clusters containing rbd volumes, cephfs, radosgw pools) -
sometimes even ten times slower. Also there have been issues with
performance when the cluster was over 65%~ full, there has been a
significant slowdown. ANother issue we've battled was stuck i/o in
the cluster, where a VM had an operation stuck and generated 60k
iops, only thing that helped was deleting the volume. I'm not
saying these issues can't be solved, but for the time being, we've
decided to downgrade :)</p>
<p>Josef<br>
</p>
<br>
<div class="moz-cite-prefix">On 16/02/18 10:14, Sean Redmond wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAJuy6gRwgA87AKhz6yXbnNpFYTgk6EjXEEsNPAY83znt-Aw+HA@mail.gmail.com">
<div dir="ltr"><span
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Hi
Josef,</span>
<div
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial"><br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial">I
can't help you with the cinder type migrations, however I am
interested to know why you find ceph Luminous with RBD is not
production ready in your case.</div>
<div
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial"><br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial">I
have a cluster here supporting over 1k instances all backed by
RBD and find it very reliable in production.</div>
<div
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial"><br>
</div>
<div
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial">Thanks</div>
<div class="gmail_extra"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial">
<div class="gmail_quote">Sean Redmond</div>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Fri, Feb 16, 2018 at 8:56 AM, Josef
Zelenka <span dir="ltr"><<a
href="mailto:josef.zelenka@cloudevelops.com"
target="_blank" moz-do-not-send="true">josef.zelenka@cloudevelops.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hello
everyone,<br>
<br>
i'm currently trying to figure out how to migrate my volumes
from my ceph backend. I'm currently using Ceph Luminous, but
so far it has proven not really prod ready for us, so we
want to downgrade. However, our client already has some of
his VMs on this ceph cluster and downgrading means backing
them up somewhere. THe best course of action for us would be
live migration to local lvm storage, but it isn't possible
via the standard cinder migrate tool - i always get an
error, nothing happens. We are running openstack pike. Does
anyone have any procedures/ideas for making this work? Our
last resort is rbd exporting the volumes to another cluster
and then importing them back after the downgrade, but we'd
prefer to do a live migrate. Apparently this has worked in
the past. Thanks<br>
<br>
Josef Zelenka<br>
<br>
<br>
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</blockquote>
</div>
<br>
</div>
</blockquote>
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