Re: TCP failed connection attempts

[Ирек Фасихов <malmyzh@xxxxxxxxx>]

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 <daniel.vanderster@xxxxxxx>:

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
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

--

С уважением, Фасихов Ирек Нургаязович

Моб.: +79229045757

_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com