<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On 17 March 2015 at 22:02, Davis, Amos (PaaS-Core) <span dir="ltr"><<a href="mailto:amos.steven.davis@hp.com" target="_blank">amos.steven.davis@hp.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Ceph/Cinder:<br>
LVM or other?<br>
SCSI-backed?<br>
Any others?<br></blockquote><div><br></div><div>I'm wondering why any of the above matter to an application. The entire point of cinder is to abstract those details from the application. I'd be very strongly resistant to add any API to cinder that exposed any of the above. Is there some significant difference the above makes, from an application POV? If so, please do let me know, since it is probably a bug<br><br></div><div>There *are* details about cinder that are sensible to expose however:<br><br></div><div> Are consistency groups supported?<br></div><div> Is replication supported?<br></div><div> Is the backup service enabled?<br></div><div> Do snapshots of an attached volume work?<br></div><div> Are there restrictions to backing up snapshots, or snapshotted volumes, or volume from snapshots?<br></div><div><br></div><div>...and probably others. I don't think there's a good answer to how to answer these questions yet, and I agree we need to get that on the road map. Some of the above questions should ideally only have one question, but there are limitations on various drivers that we've not yet fixed.<br></div><div> </div></div>-- <br><div class="gmail_signature">Duncan Thomas</div>
</div></div>