<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"><base href="x-msg://1704/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Ultimately it would be nice for cinder to have a concept of a read-only volume that could be attached to multiple instances, but in this case I think it is a bug. The whole point of reserving the volume in cinder is so that this cannot happen. Reserving should be atomic and cinder should reject the reserve if it is already reserved.<div><br></div><div>Vish</div><div><br><div><div>On Dec 11, 2012, at 11:19 AM, "Karajgi, Rohit" <<a href="mailto:Rohit.Karajgi@nttdata.com">Rohit.Karajgi@nttdata.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div lang="EN-US" link="blue" vlink="purple" style="font-family: Menlo; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="WordSection1" style="page: WordSection1; "><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Hi,<o:p></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">I would like to get opinions on whether we should allow multiple instances to be booted from a single volume.<o:p></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">This is incorrectly allowed currently, the same volume seems to get attached to each instance and the instances boot to Active status.<o:p></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">More details can be seen in description of the bug<span class="Apple-converted-space"> </span><a href="https://bugs.launchpad.net/nova/+bug/1087253" style="color: purple; text-decoration: underline; ">https://bugs.launchpad.net/nova/+bug/1087253</a>.<o:p></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Ideally, the best way to achieve this would be pass a list of block device mappings equal to the number of instances requested,<o:p></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">changes going in to the Nova API code.<o:p></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">Is it more feasible to restrict more than one instance to be passed with a single block device mapping, or accept a list of BDMs?<o:p></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: Arial, sans-serif; ">Regards,<o:p></o:p></span></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><span style="font-size: 10pt; font-family: Arial, sans-serif; ">Rohit</span><o:p></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; "><o:p> </o:p></div></div><br clear="both">______________________________________________________________________<br>Disclaimer:This email and any attachments are sent in strictest confidence for the sole use of the addressee and may contain legally privileged, confidential, and proprietary data. If you are not the intended recipient, please advise the sender by replying promptly to this email and then delete and destroy this email and any attachments without any further use, copying or forwarding<br>_______________________________________________<br>OpenStack-dev mailing list<br><a href="mailto:OpenStack-dev@lists.openstack.org" style="color: purple; text-decoration: underline; ">OpenStack-dev@lists.openstack.org</a><br><a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" style="color: purple; text-decoration: underline; ">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><br></div></blockquote></div><br></div></body></html>