From rob at iris.washington.edu  Thu May 21 12:33:14 2009
From: rob at iris.washington.edu (Robert Casey)
Date: Thu, 21 May 2009 12:33:14 -0700
Subject: [dhi-clients] DHI Server Transition - May 26th
Message-ID: <2D891765-4BA3-482C-A2B8-87078DA97D9C@iris.washington.edu>



	DHI Server Transition - May 26th

	The IRIS DMC is consolidating its DHI services on a new machine and  
will attempt to switch all client connections to that new machine on  
Tuesday, May 26th at 10 AM PDT.

	What we will do on the 26th is redirect the dmc.iris.washington.edu  
Nameserver to point to this new machine for all data processing.  The  
change should be very quick and should not affect most users of DHI  
clients, such as SOD, JWEED, and VASE.  Those affected will be ones  
with long-lived persistent connections to such services as the  
BUD_DataCenter, which allows real-time data feeds.

	We will retire the old data services within a week of this  
switchover, so we ask our user community to please restart persistent  
DHI clients shortly after the May 26 switch.  The new machine will be  
identified as 'dhiserv.iris.washington.edu'.  Those with firewall  
restrictions will want to allow this hostname for their clients, much  
in the same way as they allowed connnections to  
dmc.iris.washington.edu.  Clients will still make their initial  
(Nameserver) connections to dmc.iris.washington.edu and are then  
redirected to dhiserv, so support for both of these hostnames must be  
ensured.  Tools like VASE and JWEED will not have to change their  
configuration to use the new servers.

	We will provide notifications on the dhi-servers and dhi-clients  
mailing lists as we progress through the upgrade phases.  We expect  
little difficulty in having high availability during this transition,  
but users should be aware of the possibility of unexpected outages  
during the switchover period.  We appreciate your patience as we work  
to improve the performance and availability of our DHI services.

	-rec