<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><span></span></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div style="-webkit-text-size-adjust: auto;"><span></span></div><div><span style="-webkit-text-size-adjust: auto;"></span><br><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Hi, stackers:</span><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">I am confused about reading the original BP ([1]) and operation guide of nova-cells, the question as follows:</span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">One aim of nova-cells is to allow additional scaling and (geographic) distribution without complicated database or message queue clustering, and <span id="">OpenStack Compute cells are designed to allow running the cloud in a distributed fashion without having to use more complicated technologies, or being invasive to existing nova installations.</span> </span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id=""><span id="" style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">The typical use case for cells is a cloud with two independent sites with a single API endpoint. </span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id=""><span id="" style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">However, take cinder into account, it will require Cinder act as a shared service for the two sites? </span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">For two independent sites with existing cloud installations, in order to *upgrade* to cells later, we must make sure the storage networks of these sites connected to each other as early as building the two sites? </span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><font id="">In order to provide shared service for two sites, we must use the storage with geographic distribution? </font>Among current Cinder backend drivers,<span id=""> it seems there are only glusterfs and ceph?</span></span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><span id="">Furthermore, I think Cinder need to provide the "site-</span>affinity“ filter for this scenario, does it?</span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id=""><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Is my understanding correct? </span></div><div id="aeaoofnhgocdbnbeljkmbjdmhbcokfdb-mousedown"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id="aeaoofnhgocdbnbeljkmbjdmhbcokfdb-mousedown"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div id="aeaoofnhgocdbnbeljkmbjdmhbcokfdb-mousedown"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">[1] <a href="https://wiki.openstack.org/wiki/Blueprint-nova-compute-cells">https://wiki.openstack.org/wiki/Blueprint-nova-compute-cells</a></span></div></div></div></body></html>