What is the value of imaxpct for your xfs partition? How many inodes are currently in use? The SOLR server may suffer from inode exhaustion due to caching of repository data in small tgz files, but this typically is only a problem on non-xfs partitions and requires a substantial amount of nodes to be created in Alfresco in the first place.
I think the problem is provoked by the SOLR suggester, which creates large files under /opt/alfresco/tomcat/temp in some versions. This path is not part of alf_data partition. The easy way is to disable suggester in SOLR (solr.suggester.enabled=false) in solrcore.properties config (for workspace core).