I configure my seafile cluster, to only use the memcached of the application servers, and not of the background node.
this went very well for 1:20h, then suddenly I got a lot of the SERVER IS MARKED ERRORS again. Unfortunately without any indication on which server is marked dead...
after restarting seafile, the errors were gone. amazingly, they did not reappear again since then. so, fingers crossed, it seems this solved this problem.
I have one other issue concerning memchached:
[01/09/2018 10:21:15 AM] ../common/obj-cache.c(106): Failed to set e612a24e-02f8-44fa-8700-ea2b4e05e7bf-a39558348330e29a2c77dfe75c86d9573b908364 to memcached: ITEM TOO BIG.
I see this error every now an then (if it occurs, it occurs many times within a few seconds). all those errors correspond to one library which is very large (4TB). is this something I have to worry about? would it make sense to increase the max item size memcached can handle?