<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof ContentPasted13">
Hello, All !
<div><br class="ContentPasted13">
</div>
<div class="ContentPasted13">There is one issue with Active/Actvie cinder cluster. Each cinder-volume instance in cluster holds it's own local allocated_capacity_gb. When cinder-volume service starts it counts all volumes created on particular pool and calculates allocated_capacity_gb
accordingly. If one instance of cinder-volume create volume - it increase its local allocated_capacity_gb. If other instance delete volume - it decrease its local allocated_capacity_gb. And each instance of cinder-volume in cluster reports its own local allocated_capacity_gb.
It cause incorrect allocated_capacity_gb presented to cinder get-pools --detail. And it is able to see even negative value of allocated_capacity_gb for pool.</div>
<div><br class="ContentPasted13">
</div>
<div class="ContentPasted13">There is reported issue about it:</div>
<div class="ContentPasted13">https://bugs.launchpad.net/cinder/+bug/1927186</div>
<div><br class="ContentPasted13">
</div>
<div class="ContentPasted13">There is document about different approaches of Active-Active cinder support, but there is nothing about incorrect allocated_capacity_gb report on it:</div>
<div class="ContentPasted13">https://docs.openstack.org/cinder/latest/contributor/high_availability.html</div>
<div><br class="ContentPasted13">
</div>
<div class="ContentPasted13">Looks like without fixing allocated_capacity_gb we have to get all valumes and calculate this value by portal (it isnt quite effective and resource consuming by the way).</div>
<div><br class="ContentPasted13">
</div>
<div class="ContentPasted13">Are there any plans to complete Active/Active support for cinder ? </div>
<div class="ContentPasted13">For example as the coordinator is demand for Active/Active support</div>
<div class="ContentPasted13">(“My recommendation is to do this right: configure the cluster option,</div>
<div class="ContentPasted13">remove the backend_host, and configure the coordinator.”, https://lists.openstack.org/pipermail/openstack-discuss/2020-November/018853.html)</div>
- it is possible to move allocated_capacity_gb for each pool to redis or to listen notification queue and change local allocated_capacity_gb for each instance of cinder-volume accordingly<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof ContentPasted0 ContentPasted10">
<span style="display: inline !important; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);" class="ContentPasted11"><span style="display: inline !important; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);" class="ContentPasted12"></span></span></div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof ContentPasted0">
<span style="display: inline !important; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);" class="ContentPasted7"><br>
</span></div>
<div class="_Entity _EType_OWALinkPreview _EId_OWALinkPreview _EReadonly_1">
<div id="LPBorder_GTaHR0cHM6Ly9idWdzLmxhdW5jaHBhZC5uZXQvY2luZGVyLytidWcvMTkyNzE4Ng.." class="LPBorder249460" style="width: 100%; margin-top: 16px; margin-bottom: 16px; position: relative; max-width: 800px; min-width: 424px;">
<table id="LPContainer249460" role="presentation" style="padding: 12px 36px 12px 12px; width: 100%; border-width: 1px; border-style: solid; border-color: rgb(200, 200, 200); border-radius: 2px;">
<tbody>
<tr valign="top" style="border-spacing: 0px;">
<td style="width: 100%;">
<div id="LPTitle249460" style="font-size: 21px; font-weight: 300; margin-right: 8px; font-family: wf_segoe-ui_light, "Segoe UI Light", "Segoe WP Light", "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif; margin-bottom: 12px;">
<a target="_blank" id="LPUrlAnchor249460" href="https://bugs.launchpad.net/cinder/+bug/1927186" style="text-decoration: none;">Bug #1927186 “the value of allocated_capacity_gb is Incorrect wh...” : Bugs : Cinder</a></div>
<div id="LPDescription249460" style="font-size: 14px; max-height: 100px; font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif; margin-bottom: 12px; margin-right: 8px; overflow: hidden; color: rgb(102, 102, 102);">
the value of allocated_capacity_gb is incorrect when the number of replaca of cinder-volume is more than one and all of them configurated same backend, We set up more than one cinder-volume service ,and all of them have the same config file with the same storage
backend. When all cinder-volume services complete initialization, the value of 'allocated_capacity_gb' that command of 'cinder get pools -detail' returned is correct.But once any creating or deleting volumes has been done, the value...</div>
<div id="LPMetadata249460" style="font-size: 14px; font-weight: 400; font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif; color: rgb(166, 166, 166);">
bugs.launchpad.net</div>
</td>
</tr>
</tbody>
</table>
<div id="LPCloseButtonContainer249460" class="uHkAz" tabindex="0" title="Remove link preview" role="button">
<i data-icon-name="Cancel" aria-hidden="true" id="LPCloseButton249460" class="Rm9Q1 root-275"></i></div>
</div>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<br>
</div>
</body>
</html>