solr and dovecot: high load

Hi, we have a strange issue with solr: sometimes, usually everyday at around midnight, solr becomes unreachable due to a high cpu load and high I/O activity. Our configurations are:  - Solr 7.7.3 on CentOS 7  - Dovecot 2.3.18 on CentOS 7  - /var/solr is around 250GB  - the Solr server has 4

Re: solr and dovecot: high load

Hello, thank you for the answers. We reduced the heap size to 20GB and it has made the situation better: it didn't stop, but the I/O activity was still high. We are a bit at a loss on what to monitor, maybe the garbage collector activity? I'm not aware of any particular planned recurrent