[Checkins] SVN: gocept.zeoraid/trunk/doc/OPERATION.txt Re #484727: Document the issues with recovery in a multi-ZEORaid setup.

[Christian Theune]

Log message for revision 105855:
  Re #484727: Document the issues with recovery in a multi-ZEORaid setup.
  
  

Changed:
  U   gocept.zeoraid/trunk/doc/OPERATION.txt

-=-
Modified: gocept.zeoraid/trunk/doc/OPERATION.txt
===================================================================
--- gocept.zeoraid/trunk/doc/OPERATION.txt	2009-11-19 07:50:26 UTC (rev 105854)
+++ gocept.zeoraid/trunk/doc/OPERATION.txt	2009-11-19 07:50:59 UTC (rev 105855)
@@ -2,6 +2,7 @@
 Operational notes
 =================
 
+
 Packing
 =======
 
@@ -42,3 +43,22 @@
 server becomes available. In case you want to start without the ZEO server
 being available, you need to configure the option `wait false` into your
 corresponding. zeoclient section.
+
+
+Recovery in Multi-ZEORaid setups
+================================
+
+If multiple ZEORaid servers are used in parallel and a storage has failed then
+recovery needs some extra steps:
+
+- Stop all ZEORaid servers except one
+
+- Recover the failed storage on the remaining ZEORaid server
+
+- Restart the redundant ZEORaid servers
+
+Note: Not following these steps won't cause a core meltdown, however, without
+following those steps you will not be able to successfully recover a failed
+storage under load. There is a feature wish recorded in launchpad that will
+implement a behaviour which will allow to keep the redundant ZEORaid servers
+running.