[THIN] Re: high availability
- From: "Ron Oglesby" <roglesby@xxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Tue, 11 May 2004 07:46:10 -0500
Well. One thing that I can say is any location you have a Citrix server
using a SQL server the DB should be read/write/. Now what do I mean by that?
I mean that you should be using a publisher/subscriber model with
transactional replication/immediate updating. This will allow the changes
from servers talking to the subscriber to be pushed up to the Publisher
(master) written into the DS, then replicated to all servers.
The trick with this is that any servers online are going to have changes (of
some type, print drivers added, hotfixes added, etc). And these changes need
to update the DS. So I would not use a straight push for any SQL server with
hot online servers connecting to it. Now to use one as a COLD SQL server you
can do that. But lets assume a site loss. You have lost 50-75 servers in one
site along with the Datastore. Now you have a shipped Database to another
site. And you are going to start installing servers into that site to get
you up to capacity. All the shipping did was handle your published apps and
licenses for the most part, since the 75 servers are "gone" but remain as
ghosts in the DS and you still have to get a bunch of servers on line.
Get it?
Ron Oglesby
Senior Technical Architect
Microsoft MVP - Windows Server
RapidApp, Chicago
Mobile 815 325-7618
Office 312 372-7188
e-mail roglesby@xxxxxxxxxxxx
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Lilley, Brian
Sent: Tuesday, May 11, 2004 3:10 AM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Re: high availability
Big Ron,
Thanks again for your response.
I will be replicating a master read/write copy of the database to perhaps 5
major regional sites and maybe a couple more at a push.
Again, back to the DR hot-sites, should I make a data store present there
also?
I guess it's a balance between reducing the complexity of the data store
replication and having a truly 'marooned' DR site available almost
immediately.
Personally, from the feelings I got from this list, I would tend towards
keeping the data store replication to a minimum and allowing the DR scenario
the Citrix grace period to restore a data store onto an Oracle box which is
pretty straight forward.
When I first asked about data store replication some weeks ago, I mentioned
replication to ten servers globally for a single farm model (and most of the
old timers winced slightly). I am still looking to move forward with a
global
single farm with data store replication to a reduced number, prob 5 or so...
do you guys still hold the same view?
Also, can DSCHECK.EXE be trusted as a signature for health on the IMA data
store?
best regards,
Brian
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Ron Oglesby
Sent: 10 May 2004 20:07
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: high availability
Simple answer. No it does not need to be clustered. Complicated answer...
maybe.
I mean the real trick is how many (and what type) of changes will you need
to make if it is unavailable. In most cases your answer will be none. We can
operate without making changes to the DS for a couple of days. If that is
true then you don't need the cluster.
Replication or shipping of the DB/Logs is needed though for any type of DR.
Of course there are drawbacks to this too. I mean If you use transactional
replication then when the primary is gone you cant make changes anyway
(until you turn the subscriber into the publisher). So it all depends.
Hey, I can come out and work on this with ya. It sounds fun and right up my
alley.
Ron Oglesby
Senior Technical Architect
Microsoft MVP - Windows Server
RapidApp, Chicago
Mobile 815 325-7618
Office 312 372-7188
e-mail roglesby@xxxxxxxxxxxx
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Lilley, Brian
Sent: Monday, May 10, 2004 8:39 AM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] high availability
Chaps, I need to draw on your experiences again...
Does the primary IMA Data Store really need to be clustered, or is this more
complication than it is worth. KISS principle, etc.?
I appreciate that high availability is important, but isn't the integrity of
the database even more important. Without a Data Store, what's the worse
that
could happen during the 96 hours, you can't make changes??
If something was seriously wrong the master IMA Data Store cluster node A,
would we want the second cluster to take over? Is there not a further
chance
of corrupting data by having this nice-ity??
If the Data Store becomes unavailable, presumably an app server can still
boot
from the contents of the LHC?
thanks,
Brian
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