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Adding a second instance to a cluster Expand / Collapse
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Posted Friday, August 10, 2012 4:04 AM
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Hi there,

I currently have a single instance cluster with 2 nodes and I have a requirement to add a second instance to it (both instances will be live on the same node, so one node will still be 'passive'). I just have the following questions:

1. Can I specify the same network name for the second instance during setup? So the instances would be as follows...cluster1\inst1, cluster1\inst2.
2. Does installing a second instance require any additional IP addresses?
3. Can the second instance share the same SAN disks as the first, so all the MDF and LDF files are in the same location?

Thanks,

Matt



Post #1343246
Posted Friday, August 10, 2012 7:19 AM


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matt.gyton (8/10/2012)
1. Can I specify the same network name for the second instance during setup? So the instances would be as follows...cluster1\inst1, cluster1\inst2.

No, networknames, like computernames, must be unique in the Windows domain.


matt.gyton (8/10/2012)
2. Does installing a second instance require any additional IP addresses?

Yes, IP address, network name, storage, etc


matt.gyton (8/10/2012)
3. Can the second instance share the same SAN disks as the first, so all the MDF and LDF files are in the same location?

No, you need separate storage resources for each new instance.


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Post #1343381
Posted Friday, August 10, 2012 7:45 AM
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That's great, thanks Perry.
Post #1343403
Posted Friday, August 10, 2012 8:23 AM
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Actually just one more question if I may....

Would we only need new disks for the Data and Logs for the new instance? (and just keep the single instances of Quorum and MSDTC for the whole cluster)

So we would go from this:

Q: - Quorum
M: - MSDTC
D: - Data
L: - Logs

...to this:

Q: - Quorum
M: - MSDTC
D: - Instance1 Data
L: - Instance1 Logs
K: - Instance2 Data
J: - Instance2 Logs

(...we won't worry where the tempdb is for now! )
Post #1343434
Posted Friday, August 10, 2012 8:32 AM


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you only need 1 quorum disk resource, period. There are other quorum models available and depending on the number of nodes and geographical location, you could probably do away with quorum disk altogether

With regards to MSDTC, yes you could possibly get away with one resource for both instances especially as they're all going to be active on the same node


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Post #1343445
Posted Friday, August 10, 2012 8:36 AM
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Excellent - Thanks again.
Post #1343452
Posted Wednesday, August 15, 2012 9:05 AM
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Sorry to revive this thread but I have encountered one final dilemma during the SQL Install...!

When installing the second instance to the existing cluster, in addition to giving the new instance it's own Network name, does it have to have a different instance name too or can I have 2 default instances with different network names?

So could I have the following both hosted on the same cluster:

cluster1/MSSQLSERVER
cluster2/MSSQLSERVER

Or would it have to be something like:

cluster1/MSSQLSERVER
cluster2/instance2

The first default instance is already on there.

Thanks
Post #1345324
Posted Wednesday, August 15, 2012 9:16 AM


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No, you may have only 1 default instance. The rest would be named

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Post #1345332
Posted Wednesday, August 15, 2012 9:22 AM
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Thanks again Perry....just wondered if I might be able to get away with it as they had different network names!

Cheers
Post #1345338
Posted Wednesday, August 15, 2012 12:11 PM


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No, the network names have nothing to do with it, it's the instance name that is the restriction. Each machine can only have 1 default instance clustered or not.

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Post #1345439
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