Radar Operations
Center continues troubleshooting the ROC latency issue with
legacy OPSNet engineering. Moving the aggregate function to
the ROC yesterday brought the latency of the alternate path
down from over 30 minutes to under 2 seconds as the "acting
primary" path. Data transmission via Silver Spring as an
"acting Alternate" path also remained under 2 seconds giving
external users the impression of restoration of service.
Today we will roll
back to Silver Spring as our Primary aggregate. (the system
default). If successful, it will restore the system back to
normal operation. Rolling the aggregate will cause temporary
system latency issues
Right now both
streams are up and there is no Critical Weather Day in effect.
1) At 1:00 PM
(Central time) - the TDS will be rebooted. It will stop data
flow via that path for about 5 minutes. When it comes back on
line, it's entire queue will still be available allowing users
to "catch up" on that stream. (THE RDS PATH WILL BE UNTOUCHED
AT THAT TIME.)
2) about an hour
later (2:00 PM Central) - NL2 should be "running normal" once
again. and we will roll the aggregate function back to Silver
Spring.
a) At Silver
Spring (as aggregate) - they will stop & restart LDM as
they take over. The aggregate rebuilds connections to all
the NEXRAD sites and starts sending it's queue to the TDS.
Users will see data stop then "quickly" catch up.
b) At the ROC
(as Alternate) - once the aggregate starts sending data the
ROC severs will start forwarding. (BUT THERE WILL BE A
SHORT PERIOD AROUND 2 PM WHERE BOTH MOMENTARILY STOP)
If the latency
problem from last week persists, the ROC will fall about 30
minutes behind. The ROC & Legacy OPSNet Engineering will
use that configuration as an opportunity to examine and
resolve the issue.
It is our intent
to restore BOTH paths back to normal operation.
If weather looks
like it will become a factor, we will refrain from
troubleshooting and maintain a data monitoring function.
Thank you for your
understanding for the short notices in this situation...
...Don
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*Donald J. Horvat * ____ *
* * / \ _____ _______ _____*
*Sr. Systems Engineer *( ) / ___ ) / ___ / / ___/*
* Support Contractor * \____/ / /__/ / / / / / / / *
*WSR-88D Radar Operations Center* |\/| / ___ < / / / / / / *
* * |/\| / / / / / /__/ / / /___ *
*1313 Halley Circle * |\/| /_/ /_/ /______/ /_____/ *
*Norman, OK 73069 * |/\| *
* * WSR-88D RADAR OPERATIONS CENTER *
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*Phone: (405) 573-3418 * e-mail: address@hidden *
*FAX: (405) 573-3340 * *
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