[THIN] Re: high availability
- From: "Rowlandson, John" <John.Rowlandson@xxxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Tue, 11 May 2004 19:18:55 +1000
Mallesons Stephen Jaques
www.mallesons.com
Confidential communication
correct this is one of a couple of sql clusters and no not dedicated to =
citrix. as you say probably overkill for most ppl.
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Lilley, Brian
Sent: Tuesday, 11 May 2004 6:54 PM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Re: high availability
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. =20
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 =3D
alias ie "sqlprod"
then we have a sql cluster in secondary (dr) which has sql log shipping =
=3D
running
if we fail over to the secondary cluster then we change the dns entry =
=3D
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 =3D
perhaps 5
major regional sites and maybe a couple more at a push. =3D20
Again, back to the DR hot-sites, should I make a data store present =3D
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 =3D
towards
keeping the data store replication to a minimum and allowing the DR =3D
scenario
the Citrix grace period to restore a data store onto an Oracle box which =
=3D
is
pretty straight forward.
When I first asked about data store replication some weeks ago, I =3D
mentioned
replication to ten servers globally for a single farm model (and most of =
=3D
the
old timers winced slightly). I am still looking to move forward with a =
=3D
global
single farm with data store replication to a reduced number, prob 5 or =
=3D
so...
do you guys still hold the same view?
Also, can DSCHECK.EXE be trusted as a signature for health on the IMA =
=3D
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 =3D
answer...
maybe.=3D20
I mean the real trick is how many (and what type) of changes will you =
=3D
need
to make if it is unavailable. In most cases your answer will be none. We =
=3D
can
operate without making changes to the DS for a couple of days. If that =
=3D
is
true then you don't need the cluster.=3D20
Replication or shipping of the DB/Logs is needed though for any type of =
=3D
DR.
Of course there are drawbacks to this too. I mean If you use =3D
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.=3D20
Hey, I can come out and work on this with ya. It sounds fun and right up =
=3D
my
alley.=3D20
Ron Oglesby
Senior Technical Architect
Microsoft MVP - Windows Server
=3D20
RapidApp, Chicago
Mobile 815 325-7618
Office 312 372-7188
e-mail roglesby@xxxxxxxxxxxx
=3D20
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On =
=3D
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 =
=3D
more
complication than it is worth. KISS principle, etc.?
I appreciate that high availability is important, but isn't the =3D
integrity of
the database even more important. Without a Data Store, what's the =3D
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 =
=3D
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 =3D
still
boot
from the contents of the LHC?
thanks,=3D20
Brian
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