I see...but I feel cpu was normal, memory was ok, disk space too...what may be affecting unix domain sockets and hangs? BTW, this is a sample output from the same zone, now that is responding fine. Would you please give me some insights to what are the interesting numbers in these cases? sonicle@cloudserver:~$ prstat -mL PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROCESS/LWPID 26840 sonicle 5.3 0.0 0.0 0.0 0.0 0.0 95 0.0 6 3 111 0 imapd/1 23455 sonicle 3.1 0.2 0.0 0.0 0.0 0.0 97 0.0 82 3 843 0 imapd/1 5952 sonicle 0.2 0.5 0.0 0.0 0.0 99 0.1 0.0 1K 1 13K 0 slapd/7sonicle@cloudserver:~$ vmstat kthr memory page disk faults cpu r b w swap free re mf pi po fr de sr s0 s1 s2 s3 in sy cs us sy id 0 0 0 20345404 1559380 416 1750 0 0 0 0 0 -0 18 4 99 5798 49801 17818 3 2 95sonicle@cloudserver:~$ mpstatCPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 0 190 0 32 592 124 1826 11 101 81 0 2519 2 3 0 95 1 113 0 48 318 32 1411 3 69 71 0 4228 4 2 0 94 2 96 0 44 537 34 1157 3 61 67 0 4213 4 3 0 93 3 89 0 39 338 78 1220 3 68 75 0 3165 3 2 0 95 4 272 0 17 269 31 1174 5 48 64 0 2047 1 2 0 97 5 115 0 43 327 46 1271 3 57 69 0 3488 4 2 0 94 6 79 0 30 260 33 881 2 46 58 0 2622 3 1 0 96 7 91 0 49 336 51 1267 3 56 68 0 2930 4 2 0 95 8 77 0 25 257 39 719 3 42 48 0 2280 2 1 0 96 9 87 0 40 271 37 878 2 50 56 0 3109 4 1 0 95 10 95 0 48 284 45 950 2 52 58 0 3392 4 2 0 95 11 81 0 27 233 33 696 2 39 47 0 2836 3 1 0 96 12 83 0 47 327 46 1237 3 56 67 0 3383 4 2 0 95 13 88 0 31 346 134 899 2 46 57 0 3022 4 1 0 95 14 117 0 47 410 152 1264 3 57 68 0 4247 5 2 0 93 15 76 0 27 692 508 968 3 47 75 0 2319 2 2 0 96 ---------------------------------------------------------------------------------------- Sonicle S.r.l. : http://www.sonicle.com Music: http://www.gabrielebulfon.com Quantum Mechanics : http://www.cdbaby.com/cd/gabrielebulfon ---------------------------------------------------------------------------------- Da: Robert Mustacchi disc...@lists.illumos.org Data: 21 aprile 2016 20.09.28 CEST Oggetto: Re: [discuss] netstat -a hanging on domain sockets On 4/21/16 11:07 , Gabriele Bulfon wrote: Hi, I had a strange situation on a server starting to respond very slow on almost any deamon (tomcat/apache/ssh/cyrus). While prstat/top did not show any high cpu usage (under 5%) and prstat -Z didn't show any very high memory usage, and swap look there unused...I tried running netstat -a to see how many sockets where there serving. The result was a very fast output of all the normal sockets, and then hanging for 10-30 seconds before the output of active UNIX domain sockets. I repeated the command some times, but didn't think about saving the output somewhere, so I don't know what the domain sockets state was (which files, where). I can say the machine runs amavis / spamd / lmtpd /saslauthd / cyrus / postfix / apache / tomcat / postgres for more than 600 users. Is there anything I should look deeper about the domain socket usage? Is it possible that they were so much busy slowing down every socket (even ssh took 1 to 2 minutes to take me to the bash). In general, you should use the -n option to netstat whenever you're debugging so you're not generating a lot of dns resolutions. But when you're looking at that kind of thing, you should start with your CPU microstates for processes (usually the -mL options to prstat) and tools like mpstat and vmstat. Robert
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