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Hi, We are noticing a steady increase in the number of open files on our xcache server in Munich, in particular when the server is under heavy load: [plot_openfiles_xcache_20190506_1719.pdf](https://github.com/xrootd/xrootd/files/3151584/plot_openfiles_xcache_20190506_1719.pdf) It seems the files are not closed anymore, even if the connections are and the files are fully downloaded as suggested by looking at the network traffic monitoring for the same time periods: [plot_openfiles_xcache_20190506_1719_ganglia_overlay.pdf](https://github.com/xrootd/xrootd/files/3151594/plot_openfiles_xcache_20190506_1719_ganglia_overlay.pdf) We are running with prefetch mode enabled with xrootd 4.9.1 (0.rc3.el7). When the number of open files hits the limit (in our case ~16k), clients start receiving empty or corrupt files (checksum errors). Sometimes the xrootd process also crashes then with SEGV. In most cases the files can be received correctly after a restart of the xrootd process. Cheers, Nikolai -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/975 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1