<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>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.<br><div><br><span> 10.0.0.31.24/0<br> state 1 established snd_wscale 10 rcv_wscale 10 rto 18558000 ato 40000<br> retransmits 4 probes 0 backoff 4 options: TSTAMP SACK WSCALE<br> rtt 2761650 rttvar 3238039 snd_ssthresh 4 snd_cwnd 5 unacked 0<br> snd_mss 1992 rcv_mss 1992 pmtu 2044 advmss 1992 rcv_ssthresh 157708<br> sacked 0 lost 0 retrans 0 fackets 0 reordering 3 ca_state 'open'<br><br></span><br></div></div><div></div>
<div>Jim<br></div><div><br></div>
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On Thursday, September 27, 2018, 11:14:43 AM EDT, Buterbaugh, Kevin L <Kevin.Buterbaugh@Vanderbilt.Edu> wrote:
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Hi All,
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<div class="yiv4097561737">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</div>
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<div class="yiv4097561737">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 … </div>
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<div class="yiv4097561737">I’ve Googled, but haven’t gotten any hits, nor have I found anything in the GPFS 4.2.2 Problem Determination Guide.</div>
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<div class="yiv4097561737">Thanks in advance…</div>
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<div class="yiv4097561737">Kevin Buterbaugh - Senior System Administrator</div>
<div class="yiv4097561737">Vanderbilt University - Advanced Computing Center for Research and Education</div>
<div class="yiv4097561737"><a rel="nofollow" ymailto="mailto:Kevin.Buterbaugh@vanderbilt.edu" target="_blank" href="mailto:Kevin.Buterbaugh@vanderbilt.edu" class="yiv4097561737">Kevin.Buterbaugh@vanderbilt.edu</a> - (615)875-9633</div>
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