[THIN] Re: high availability

  • From: "Lilley, Brian" <brian.lilley@xxxxxxxx>
  • To: "'thin@xxxxxxxxxxxxx'" <thin@xxxxxxxxxxxxx>
  • Date: Tue, 11 May 2004 09:53:30 +0100

Hi John,

I would guess that you are using these SQL clusters for other database
hosting.  My problem is that we will be dedicating sql servers to the function
of data store.  

I believe the DS doesn't necessarily demand 100% uptime and so, does not
justify the complexity of investment in very expensive clustered servers...
again, our corporate standard is SUN kit + Oracle.

best regards, Brian


-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Rowlandson, John
Sent: 11 May 2004 09:47
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: high availability


Mallesons Stephen Jaques
www.mallesons.com

Confidential communication




i do the following


sql 2000 cluster in primary DC all servers connect to this using an =
alias ie "sqlprod"


then we have a sql cluster in secondary (dr) which has sql log shipping =
running

if we fail over to the secondary cluster then we change the dns entry =
for "sqlprod" to the sec clusters IP

-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Lilley, Brian
Sent: Tuesday, 11 May 2004 6:10 PM
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. =20

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.=20

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.=20

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.=20

Hey, I can come out and work on this with ya. It sounds fun and right up =
my
alley.=20

Ron Oglesby
Senior Technical Architect
Microsoft MVP - Windows Server
=20
RapidApp, Chicago
Mobile 815 325-7618
Office 312 372-7188
e-mail roglesby@xxxxxxxxxxxx
=20
-----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,=20

Brian

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retains and monitors electronic communications sent through its network.
Instructions transmitted over this system are not binding on CSFB until they
are confirmed by us. Message transmission is not guaranteed to be secure.
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