H A advice

Question

H A advice

iruagawal

SSC Enthusiast

Points: 126
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April 6, 2010 at 11:28 am

#231470

Good day forumites,
I am looking into implementing a H A solution for my company. Its in the transition of being a midsized company from a small company. I just wanted to consult the experts on here before I make a decision on which type I should implement. We need a standby server pretty much that automatically gets switched to in the event of anything happening to the trusted server. What would be the best type to go with? Replication, Clustering, Mirroring ?? Any suggestions would be appreciated. What has worked best for you guys? I know this might also be a "it depends" question. 🙂

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ps. One Orange Chip Points: 29423 More actions · Answer 1

iruagawal (4/6/2010)
What would be the best type to go with? Replication, Clustering, Mirroring ??

I think mirorring would suit best. If the company wants to shell out little more money, i would prefer clustering at the primary site along with Mirroring as a DR solution.

Pradeep Singh

GregoryF SSCertifiable Points: 6296 More actions · Answer 2

Replication can be very have very high administrative overhead (plus if a table has no PK, it cannot be replicated)

Clustering is HA, but not DR. Clustering suffers from a single point-of-failure of the shared disks.

Mirroring and log-shipping are best for a two DC DR solution, neither is difficult to set up.

Best solution

DC1: Cluster

DC2: Mirrored server from DC1, stand-alone server does not need to have the horsepower of the servers in DC1

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xinyu.wang1 SSC Enthusiast Points: 154 More actions · Answer 3

if using vlan, clustering could be considered as a DR solution.

BTW, based on this link, http://connect.microsoft.com/SQLServer/feedback/details/353894/add-support-for-multi-subnet-clusters, multi-subnet will be supported soon.

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Sopheap Suy SSCertifiable Points: 7893 More actions · Answer 4

The answer are still the same "It depends."

What HA/DR technique are you comfortable with, is there an in house expert on that technology, or do you rely on consultant?

How much money does your company wants to spend.

What are your service level agreement?

--sopheap

iruagawal SSC Enthusiast Points: 126 More actions · Answer 5

Thanks for the responses guys, as far as the DR/HA technique, it will be done by someone learning from scratch. No consultants. From what Ive read thus far, seems like mirroring might be the way to go?

khursheed.siddiqui Old Hand Points: 312 More actions · Answer 6

Microsoft has made Clustering in windows 2008 very trivial. However it depends on the cost of SQL enterprise license. Can you afford 35K per proc if yes you should go with clustering benefit of the clustering less over head in managing the server. With mirroring that failover will work in an automated way but you still have script starting of the SQL jobs and also make sure that login information is similar to the principle server.

Perry Whittle SSC Guru Points: 234013 More actions · Answer 7

if you only want a 2 node cluster Std edition should suffice. You will lose a few other features but its still an option

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khursheed.siddiqui Old Hand Points: 312 More actions · Answer 8

Great I did not know that. I just saw it on microsoft edition doc.:-D

Dave Jones - CRC SSC-Addicted Points: 431 More actions · Answer 9

We use clustering and log shipping to a remote site. This has worked very well for us and both are pretty straight forward to setup and maintain.

But in the end, it all comes down to; how much money you can spend, how much down time is acceptable, how much data lose is acceptable. Because all 3 of those are on a sliding scale, as one goes up the others go down. Hope this helps.