<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div dir="ltr" id="yui_3_16_0_1_1425868016302_1683315"><span id="yui_3_16_0_1_1425868016302_1683317">I guess we can dig into the details here when we get into the actual writing. The storage issue seems significant to me --</span></div><div id="yui_3_16_0_1_1425868016302_1683357" dir="ltr"><span id="yui_3_16_0_1_1425868016302_1683317">I can tolerate a bit of downtime more easily than I can tolerate losing all my data... As I understand it, with Cinder LVM,</span></div><div dir="ltr"><span id="yui_3_16_0_1_1425868016302_1683317">using RAID can protect against a hard drive failure but, if you lose the Cinder LVM node itself, all the volumes stored on</span></div><div id="yui_3_16_0_1_1425868016302_1683612" dir="ltr"><span id="yui_3_16_0_1_1425868016302_1683317">that node are lost. The only alternative I know of is to use Ceph as the storage backend for Cinder.</span></div><div dir="ltr"><br><span id="yui_3_16_0_1_1425868016302_1683317"></span></div><div id="yui_3_16_0_1_1425868016302_1683614" dir="ltr"><span id="yui_3_16_0_1_1425868016302_1683317">It may be that, for the ha-guide, we only need to explain this and link to the Ceph docs for information about configuring</span></div><div dir="ltr"><span id="yui_3_16_0_1_1425868016302_1683317">Ceph.</span></div><br> <blockquote id="yui_3_16_0_1_1425868016302_1683297" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; margin-top: 5px; padding-left: 5px;"> <div id="yui_3_16_0_1_1425868016302_1683296" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div id="yui_3_16_0_1_1425868016302_1683295" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1425868016302_1683294" dir="ltr"> <hr size="1"> <font id="yui_3_16_0_1_1425868016302_1683313" face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> Matt Kassawara <mkassawara@gmail.com><br> <b><span style="font-weight: bold;">To:</span></b> Meg McRoberts <dreidellhasa@yahoo.com> <br><b><span style="font-weight: bold;">Cc:</span></b> "openstack-docs@lists.openstack.org" <openstack-docs@lists.openstack.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, March 12, 2015 4:33 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [OpenStack-docs] [ha-guide] Observations from mid-cycle ops meetup<br> </font> </div> <div id="yui_3_16_0_1_1425868016302_1683618" class="y_msg_container"><br><div id="yiv7623668827"><div id="yui_3_16_0_1_1425868016302_1683617"><div id="yui_3_16_0_1_1425868016302_1683616" dir="ltr">Ceph definitely has a following, but I don't recall specific conversation around redundant storage. Similar to physical network redundancy, I wonder if we should simply mention storage redundancy options rather than attempt to support a particular variant... especially if all of them lean toward a vendor.</div><div class="qtdSeparateBR"><br><br></div><div class="yiv7623668827yqt6967997846" id="yiv7623668827yqt16247"><div id="yui_3_16_0_1_1425868016302_1683621" class="yiv7623668827gmail_extra"><br clear="none"><div id="yui_3_16_0_1_1425868016302_1683620" class="yiv7623668827gmail_quote">On Thu, Mar 12, 2015 at 4:58 PM, Meg McRoberts <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:dreidellhasa@yahoo.com" target="_blank" href="mailto:dreidellhasa@yahoo.com">dreidellhasa@yahoo.com</a>></span> wrote:<br clear="none"><blockquote class="yiv7623668827gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"><div>Thanks, Matt -- this is very helpful.</div><div><br clear="none"></div><div dir="ltr">What about storage? It seems like Ceph as the storage back-end provides much better data protection</div><div dir="ltr">than the alternatives. Did you sense a movement towards adapting Ceph or are people clinging to LVM,</div><div dir="ltr">etc? <br clear="none"></div><div><span></span></div><br clear="none"> <blockquote style="border-left:2px solid rgb(16,16,255);margin-left:5px;margin-top:5px;padding-left:5px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr"> <hr size="1"> <font face="Arial"> <b><span style="font-weight:bold;">From:</span></b> Matt Kassawara <<a rel="nofollow" shape="rect" ymailto="mailto:mkassawara@gmail.com" target="_blank" href="mailto:mkassawara@gmail.com">mkassawara@gmail.com</a>><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> "<a rel="nofollow" shape="rect" ymailto="mailto:openstack-docs@lists.openstack.org" target="_blank" href="mailto:openstack-docs@lists.openstack.org">openstack-docs@lists.openstack.org</a>" <<a rel="nofollow" shape="rect" ymailto="mailto:openstack-docs@lists.openstack.org" target="_blank" href="mailto:openstack-docs@lists.openstack.org">openstack-docs@lists.openstack.org</a>> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Thursday, March 12, 2015 1:44 PM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> [OpenStack-docs] [ha-guide] Observations from mid-cycle ops meetup<br clear="none"> </font> </div> <div><span class="yiv7623668827"><br clear="none"></span><div><div dir="ltr">I went to the mid-cycle ops meeting for a better idea of the HA methods implemented by operators. Most seem to agree on Galera with MariaDB/MySQL, RabbitMQ active-passive/active-active (some using a load balancer and others configuring services to use each node directly), Memcached active/active (via Oslo hash synchronization), and OpenStack APIs via hardware or HAProxy load balancer. On the other hand, networking drifted all over the place. Some people live and die by nova-net and won't move to neutron until it 100% mirrors the multi-host functionality with fixed/floating IP addresses, others use neutron but only with provider networks, most don't quite trust DVR/L3HA yet, and a few implement custom code with nova-net or neutron. For networking in the HA guide, I mostly suggest referencing the networking guide scenarios rather than suggesting a particular architecture. However, we should also mention them in the introduction somewhere because different architectures may impact the minimum number and type of nodes.</div></div><br clear="none">_______________________________________________<br clear="none">OpenStack-docs mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:OpenStack-docs@lists.openstack.org" target="_blank" href="mailto:OpenStack-docs@lists.openstack.org">OpenStack-docs@lists.openstack.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-docs">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-docs</a><br clear="none"><br clear="none"><br clear="none"></div> </div> </div> </blockquote> </div></div></blockquote></div><br clear="none"></div></div></div></div><br><br></div> </div> </div> </blockquote> </div></body></html>