Thanks, I’ll try that. (Our current settings are the exact opposite of your suggestion).
I found an old thread discussing a new option, ms tcp rcvbuf, but I found that it is still not enabled by default in dumpling: "ms_tcp_rcvbuf": "0", Not sure if that’s related. Cheers, Dan -- Dan van der Ster || Data & Storage Services || CERN IT Department -- On 26 Mar 2014 at 15:49:42, Ирек Фасихов ([email protected]<mailto:[email protected]>) wrote: Hi, Daniel. I use the following settings: net.ipv4.tcp_syncookies = 0 net.ipv4.tcp_moderate_rcvbuf=0 net.ipv4.tcp_low_latency = 1 Message "failed connection attempts", can be ignored, it is not just a server error, but the client. For example: A client lost its connection to the server. 2014-03-26 18:29 GMT+04:00 Dan Van Der Ster <[email protected]<mailto:[email protected]>>: Hi all, I recently noticed our OSD servers have a very large number of TCP failed connection attempts. This is typical (output from netstat -s): 50329019 active connections openings 15218590 passive connection openings 44167087 failed connection attempts I’m not a TCP expert at all — but this doesn’t look good. Do others have similar numbers? Does anyone know if some ipv4 sysctl tuning can clear this up? Cheers, Dan -- Dan van der Ster || Data & Storage Services || CERN IT Department -- _______________________________________________ ceph-users mailing list [email protected]<mailto:[email protected]> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- С уважением, Фасихов Ирек Нургаязович Моб.: +79229045757
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