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--- litespeed_wiki:lslb:ha [2019/04/12 18:08]
Michael Alegre [Fixing Out of Sync Replication] Adjusted image properties.
+++ litespeed_wiki:lslb:ha [2020/08/12 18:44]
Lisa Clarke [Syncing Cache Between Two HA Nodes] Editing
@@ Line 229: / Line 229: @@
 Try accessing 10.10.31.31 (VIP) from the browser. You will see the backend server page. Disable one node, and you can still see the webpage. Check ADC HA status. The live node will become Master when the other one down.
+===== Syncing Cache Between Two HA Nodes =====
+Cache purge is automatically synced between two HA nodes. When a node receives a purge request, the cached file will not be deleted immediately. It will be regenerated when a new request for that URL is received.
+Further cache replication can be enabled or disabled as desired. To enable cache replication, navigate to **ADC WebAdmin Console > Configuration > HA** and set **Enable Replication for Cached Data** to ''Yes''.
+{{ :litespeed_wiki:lslb:adc-ha-enablecachereplication.png?800 |}}
+When replication is enabled, caches are synced between the HA ADC nodes. When the backend LiteSpeed Cache plugin sends a cache request to the live ADC, that request will be synced with the nodes.
+**NOTE 1**: Replication happens only between two front end High Availability ADCs, and //not// backend cluster web servers. Avoid caching on the cluster-server-node layer, as cached data within web server nodes will not be purged properly and will no longer be synchronized. In a clustered environment, LSCache data should //only be maintained at the ADC layer//.
+**NOTE 2**: Only LSCache data is synced between two HA ADCs. //Configuration is not synced//. Therefore, the ADCs must be manually configured independently to serve the same sites.
 ===== Troubleshooting =====