Hi Andy, issue is not solved. We upgraded to the xrootd version you suggested, and we left two servers with async I/O off and two with async I/O on. We have been monitoring the 4 of them over the last month but traffic has never been high and threads never saturated, independent of configuration. Sorry about that. -- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/1799#issuecomment-1408372943 You are receiving this because you commented. Message ID: <[log in to unmask]> ######################################################################## 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