In some cases ESXi is loosing time sync with windows based Time server.
In some cases flash value is 400 and in that case, NTP client won’t work.
First we need to check ntp assoc using command ntpq -c assoc and based on assid check stats using ntpq
Below outputs are after remediation and flash value is 00 – that means issue NTP is working properly.
If flash=400 then insert a “tos maxdist 30” to /etc/ntp.conf and restart ntp
ref https://kb.vmware.com/s/article/1035833
[root@Witness:~] ntpq -c as
ind assid status conf reach auth condition last_event cnt
===========================================================
1 14989 961a yes yes none sys.peer sys_peer 1
[root@Witness:~] ntpq
ntpq> rv 14989
associd=14989 status=961a conf, reach, sel_sys.peer, 1 event, sys_peer,
srcadr=172.23.180.121, srcport=123, dstadr=172.23.180.108, dstport=123,
leap=00, stratum=5, precision=-23, rootdelay=70.358, rootdisp=137.589,
refid=172.23.180.118,
reftime=e5c98d6e.e4338491 Wed, Mar 2 2022 6:30:06.891,
rec=e5c9904a.fa749454 Wed, Mar 2 2022 6:42:18.978, reach=037,
unreach=0, hmode=3, pmode=4, hpoll=6, ppoll=6, headway=19, flash=00 ok,
keyid=0, offset=7.346, delay=0.552, dispersion=438.310, jitter=3.720,
xleave=0.079,
filtdelay= 0.55 0.74 0.78 0.70 0.79 0.00 0.00 0.00,
filtoffset= 7.35 7.12 7.24 6.38 -0.03 0.00 0.00 0.00,
filtdisp= 0.00 1.01 1.98 2.99 3.96 16000.0 16000.0 16000.0
Below you can find values while the issue was occurring.
associd=27366 status=901a conf, reach, sel_reject, 1 event, sys_peer,
srcadr=172.23.180.121, srcport=123, dstadr=172.23.180.105, dstport=123,
leap=00, stratum=5, precision=-23, rootdelay=68.451, rootdisp=7899.643,
refid=172.23.180.118,
reftime=e5c994da.b16bb129 Wed, Mar 2 2022 7:01:46.693,
rec=e5c994ec.854ba036 Wed, Mar 2 2022 7:02:04.520, reach=077,
unreach=0, hmode=3, pmode=4, hpoll=6, ppoll=6, headway=0,
flash=400 peer_dist, keyid=0, offset=-46.479, delay=0.312,
dispersion=188.367, jitter=43.868, xleave=0.033,
filtdelay= 0.31 0.51 0.36 0.32 0.52 0.58 0.00 0.00,
filtoffset= -46.48 -17.81 0.90 0.58 0.34 -0.11 0.00 0.00,
filtdisp= 0.00 0.98 1.95 2.91 3.87 4.88 16000.0 16000.0
Same settings need to be applied on vcenter appliance
To restart service on vcsa we can use the following commands
service ntpd restart
VMware admin thoughts ... 