The data is also shown in an internaldump as a part of the mmfsadm dump tscomm
data, the RTO & RTT times are listed in microseconds. So the RTO here in my
example is 18.5 seconds (see below). You can get the same information from
the Linux networking command ss -i. The normal setting for RTO is 200 ms.
Seeing retransmits and backups will drive up the RTO time. When I look at
internaldumps from node expels it is not unusual to see 13 backoffs and
retransmits and RTO to have hit 120 seconds at which point the tcp/ip
connection times out.
10.0.0.31.24/0
state 1 established snd_wscale 10 rcv_wscale 10 rto 18558000 ato 40000
retransmits 4 probes 0 backoff 4 options: TSTAMP SACK WSCALE
rtt 2761650 rttvar 3238039 snd_ssthresh 4 snd_cwnd 5 unacked 0
snd_mss 1992 rcv_mss 1992 pmtu 2044 advmss 1992 rcv_ssthresh 157708
sacked 0 lost 0 retrans 0 fackets 0 reordering 3 ca_state 'open'
Jim
On Thursday, September 27, 2018, 11:14:43 AM EDT, Buterbaugh, Kevin L
<[email protected]> wrote:
Hi All,
2018-09-27_09:48:50.923-0500: [E] The TCP connection to IP address 1.2.3.4 some
client <c0n509> (socket 442) state is unexpected: ca_state=1 unacked=3
rto=27008000
Seeing errors like the above and trying to track down the root cause. I know
that at last weeks’ GPFS User Group meeting at ORNL this very error message was
discussed, but I don’t recall the details and the slides haven’t been posted to
the website yet. IIRC, the “rto” is significant …
I’ve Googled, but haven’t gotten any hits, nor have I found anything in the
GPFS 4.2.2 Problem Determination Guide.
Thanks in advance…
—Kevin Buterbaugh - Senior System AdministratorVanderbilt University - Advanced
Computing Center for Research and [email protected] -
(615)875-9633
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