On 26.03.14, 17:48, Ирек Фасихов 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.
It refers to connection *attemtps*, that means loss of established
connection will not affect the counter.
2014-03-26 18:29 GMT+04:00 Dan Van Der Ster <daniel.vanders...@cern.ch
<mailto:daniel.vanders...@cern.ch>>:
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
Taking into account that presumably you don't have anything besides osd
daemon running on the machine, i would say that this is extraordinarily
large
number indicating that something is definitely going wrong.
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?
'netstat -s' provides verbose display of /proc/net/snmp counters for
your information. These counters don't need to be reset or cleared up in
some other way.
Cheers, Dan
-- Dan van der Ster || Data & Storage Services || CERN IT
Department --
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С уважением, Фасихов Ирек Нургаязович
Моб.: +79229045757
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