SQL server active/active clustering

Hello, could somebody tell me that sql server 2012 supports active/active clustering and how? please.

Hello,
It is supported. Please read the following posts:
http://blogs.msdn.com/b/momalek/archive/2012/04/11/creating-an-active-active-sql-cluster-using-hyper-v-part1-virtualized-storage.aspx
http://blogs.msdn.com/b/momalek/archive/2012/04/11/creating-an-active-active-sql-cluster-using-hyper-v-part2-the-clustered-instances.aspx
http://blogs.msdn.com/b/momalek/archive/2012/04/18/creating-an-active-active-sql-cluster-using-hyper-v-part3-the-active-active-configuration.aspx
Although related to SQL Server 2008 R2, they apply to SQL Server 2012 too.
Hope this helps.
Regards,
Alberto Morillo
SQLCoffee.com

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Is Distributed Transaction Coordinator services of the application role are required by SQL Server 2012 for clustering and support of SharePoint 2013.

All I want to know is if Distributed Transaction Coordinator services of the application role are required by SQL Server 2012 for clustering and support of SharePoint 2013.
I have been planning and deploying my companies first Windows Server 2012/SQL Server 2012 Always On cluster and Always On Availability Groups Multi-Subnet cluster and instances for SharePoint 2013, and I will be brutally honest, the documentation on either
the MSDN and TechNet leave alot to be desired. Continually finding links in the documentation will take me from a Windows 2012 reference to a page talking about Windows Server 2008 or R2, The differences of which there are so many when it comes to configurations,
settings, roles, services when working with SQL Server 2012. I have been confused, frustrated, screaming mad, with all the misdirection in this documentation. The documentation takes me windows 2008 R2 which is different than 2012!
Tired and trying to pick myself up off the floor!
Greg
Gman

In general, DTC is not required for SQL 2012. But, since you are asking specifically about SharePoint, it would be better to ask in a SharePoint forum. They would be more likely to know those situations where FTC might be needed by SharePoint.
.:|:.:|:. tim

Alter IP address of SQL Server AlwaysOn Failover clustering Iistener

Hi,
Is there a possibility to change the IP address of SQL Server AlwaysOn Failover clustering Listener IP address without deleting the exiting one and also retaining the same DNS name.
NOTE: Only the IP address needs to be altered rest all (DNS, port) should remain the same.
Regards
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Hi Karthikkk,
As your description, you want to modify the listener IP address in AlwaysOn availability group without changing other settings including DNS and port. To achieve this, you could modify a listener IP address on primary replica using the following statement:
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We have a new print management system that was setup using SQL server 2008 R2 clustering. Right now we have SQL MP (monitoring)(discover) 6.3.173.1. They had a failover occur a week ago and SCOM didnt throw any alerts. As a temporary
fix, I found some correlated events and setup a monitor for those events on the servers. However, the system owner wants to know if there is a MP that will monitor for a SQL cluster failover event. I have looked and looked and cant seem to find
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EFD
Warm Fuzzies!

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http://blogs.technet.com/b/birojitn/archive/2010/04/14/sql-server-2008-cluster-monitoring.aspx
Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question, please click "Mark As Answer"
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SQL server 2012 active\passive or active\active cluster

Hi all,
I will two SQL 2012 servers in a cluster, what will be the best mode: active\passive or active\active knowing that will have one clustered instance. When we use active\passive and when to use active\active? Do we use active\active if we have multiple clustered
sql instances only?
Note: the two-node sql cluster will be installed on Hyper-V 2012 R2 cluster

Download this Microsoft whitepaper about Windows 2008 R2 Failover cluster. Here's an excerpt:
Active/Active failover cluster model. All nodes in the failover cluster are functioning and serving clients. If a node fails, the
resource will move to another node and continue to function normally, assuming that the new server has enough capacity to handle the additional workload.
Active/Passive failover cluster model. One node in the failover cluster typically sits idle until a failover occurs. After a failover,
this passive node becomes active and provides services to clients. Because it was passive, it presumably has enough capacity to serve the failed-over application without performance degradation.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB4QFjAA&url=http%3A%2F%2Fdownload.microsoft.com%2Fdownload%2FF%2F2%2F1%2FF2146213-4AC0-4C50-B69A-12428FF0B077%2FWS08%2520R2%2520Failover%2520Clustering%2520White%2520Paper.doc&ei=9OzIVL-IMcPjoASv9oDICQ&usg=AFQjCNG7uT9nBQhX2P7wOJiIfzajXKttzg&bvm=bv.84607526,d.cGU
Satish Kartan www.sqlfood.com

SQL Server 2008 Active/Active Cluster in sap

Dear Experts,
We are planning to install Active/Active Cluster in SQL server 2008 for SAP. Our landscape is with two servers. We needed the answers for the queries?
1. How we have to configure SAN storage hard disks?
2. How man disks needed for Active/Active cluster?
3. Is there any documentation available with screenshots?
Regards
Prathish Philip

Dear Bala,
First, don't give new name to someone. I would prefer Balmukund.
We are new to cluster, So we are not aware what is the requirements? Our SAN team(EMC2) will do the configuration in SAN, But we have to give the requirement as how many disks should be shared for each servers etc.......Our requirement is as below.
for optimal performance of SQL, you would be in better position if one drive is given to each file. SAP should have guidelines on the same as it's their product and they would known their IO requirement better.
We have two servers and we will install SAP on both servers, If first server is down the second server has to automatically take care the application without down time( as per our knowledge we think this is Active/Active cluster).
This confuses me. You need to check how many SQL Instances they are looking it? Active/Active (I hate you use this term) normally stands for two SQL instances running on two separate nodes. There is nothing shared between them. Uri has explained it in best
possible way.
Balmukund Lakhani | Please mark solved if I've answered your question, vote for it as helpful to help other users find a solution quicker
This posting is provided "AS IS" with no warranties, and confers no rights.
My Blog |
Team Blog | @Twitter
Author: SQL Server 2012 AlwaysOn -
Paperback, Kindle

SQL Server 2014 active directory requirements

Hi,
Does anybody know if there are any issues or changes needed to be made on domain controllers, when installing/using SQL Server 2014 advanced services like Always On and In-Memory OLTP?
Thanks.
Calin

Hello,
No changes from previous version of SQL Server (2012). You only have to take in consideration the last section of the following
article.
https://msdn.microsoft.com/en-us/library/ms143506.aspx#DC_support
Hope this helps.
Regards,
Alberto Morillo
SQLCoffee.com

SQL Server 2008R2 Active-Active cluster with standard edition?

Hi all,
can I have a 2 node cluster (Windows Server 2008R2 Datacenter Edition: node_1 and node_2) forming a failover cluster with 2 instances of SQL Server 2008R2 Standard Edition (instance_A and instance_B) with:
instance_A running on node_1
instance_B running on node_2

Following thread is on similar topic:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/450dfb42-635b-4c99-ae9f-6b0a23e3430b/sql-server-2008-r2-standard-edition-failover-cluster?forum=sqldatabaseengine
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SQL Server 2014 AG + Clustered Shared Volume

I am testing this scenario in a lab environment:
Node 1 + Node 2 = Failover Instance
Node 3 = Secondary Availability Group.
I am using Shared Clustered Volumes for the Failover Cluster. This causes the volumes to appear on NODE 3 with the same paths.
That is expected.
Problem: If I add a datafile on the failover instance, it tries to add the file to Node 3 using the original path. This fails.
Because, that path already exists and locked as it's Node1/2's cluster volume path.
Any workarounds? With CSV, do I have to have different database locations? Is there any way to modify the clustered volume on one node only or drop from a node in the cluster without dropping the node from the cluster.
Thanks

Hello,
So, I'm not being critical or arguing I'm just responding to your post.
I hope MS does something about that. It is unacceptable for my company (online retail) to suffer through that.
If the resources would have been architected differently, this wouldn't have been an issue. Does it suck that the way you wanted to do it didn't work the way you thought - sure. Are there other ways that get to the same thing? Yep. Were you forced by the
infrastructure teams? Maybe, who know. My point being that it could be done many other ways that wouldn't give you this problem - which to me means it wasn't properly thought out and tested before being implemented.
This is actually called out on page 7/8 of a good white-paper about this:
http://msdn.microsoft.com/en-us/library/jj215886.aspx
In any case, I figured out a hack which should not break anything.
Good luck. Personally, I'd redo the storage.
-Sean
The views, opinions, and posts do not reflect those of my company and are solely my own. No warranty, service, or results are expressed or implied.

Cannot use file for clustered server. Only formatted files on which the cluster resource of the server has a dependency can be used. Either the disk resource containing the file is not present in the cluster group or the cluster resource of the Sql Serve

Hi
Windows serv 2012 cluster on sql 2012 cluster with 2 instance. on works fine , Second instanc ewhen i try to creat DB a get this message.
Cannot use file for clustered server. Only formatted files on which the cluster resource of the server has a dependency can be used. Either the disk resource containing the file is not present in the cluster group or the cluster resource of the Sql
Server does not have a dependency on it.
CREATE DATABASE failed. Some file names listed could not be created. Check related errors. (Microsoft SQL Server, Error: 5184)
Any help please
kam
KAMEL

Hi Saurabh
Exactly I have SQL SERVER 2012
Failover Clustering in windows server 2012 with two nodes with
two instances and exactly I run them in the same server and each instance with
three drives Backup, Data and log.
KAMEL

Unable to failover the services in active-active cluster node

Hi,
i am applying the sp2 patch for sql server 2008 r2 in active-active cluster, we have 3 services in the cluster , node 1 as 2 prefered owner and node 2 as 1 prefered owner, when i try to move the service from node 2 to node1 , i am getting the below errors
DCOM was unable to communicate with the computer XXXXXXXXX using any of the configured protocols.
The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server XXXXXXXXX. The target name used was RPCSS/XXXXXX. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when the target server principal
name (SPN) is registered on an account other than the account the target service is using. Please ensure that the target SPN is registered on, and only registered on, the account used by the server. This error can also happen when the target service is using
a different password for the target service account than what the Kerberos Key Distribution Center (KDC) has for the target service account. Please ensure that the service on the server and the KDC are both updated to use the current password. If the server
name is not fully qualified, and the target domain (XXXXXX) is different from the client domain (XXXXXXX), check if there are identically named server accounts in these two domains, or use the fully-qualified name to identify the server.
The Cluster service failed to bring clustered service or application 'CHCROCHC045' completely online or offline. One or more resources may be in a failed state. This may impact the availability of the clustered service or application.
Cluster resource 'SQL Server (CHCROCHC045)' in clustered service or application 'CHCROCHC045' failed.
any inputs appreciated to resolve this issue as i could not procedd with patching
BR
PGR

Hi PGR,
As the issue is more related to Windows Server, I would like to recommend you post the issue in the
Windows Server forums for better support.
In addition, below are some article about troubleshooting error ” DCOM was unable to communicate with the computer XXXXXXXXX using any of the configured protocols” for your reference.
Event ID 10009 — COM Remote Service Availability
How to troubleshoot DCOM 10009 error logged in system event?
Thanks,
Lydia Zhang
Lydia Zhang
TechNet Community Support

SQL Server 2012 Failover Cluster configuration questions

Hi,
I have few questions on , SQL Server 2012 Failover cluserting pleasse provide suggestions:
1) In SQL Server 2012 is there a configuration for active / passive Failover Cluster installation? If so how is it done? if you could provide any links or articles that would help.
OR
Is this been replaced by Always ON Availability Groups?
2) Also in our environment we have done active/active installation but at a time my understanding is only node has the ownership to the shared storage versus both the nodes, is that correct? If not please provide an explanation?
Any additional information would be valuable in clearing my doubts?
Thank youy
Malini=

Hi malinisethi,
If you install SQL Server in a cluster and configure Active-Passive cluster. In the first node, select “New SQL Server Failover Cluster installation” option , when we are installing Active-Passive cluster, we have to specify one virtual/network name. (Note:
For Active-Active clustering you have specify different network names as per the number of nodes). on the other nodes is similar to installing on the first node except that we have select the Add Node to a SQL Server failover cluster option from the initial
menu. For more information, there is a similar issue about SQL Server 2008 Active-Passive/Active-Active cluster installation, you can review the following article.
http://sqldbpool.com/2009/10/07/sql-server-2008-active-passive-cluster-installation/
About Active/Active SQL Cluster, two clustered SQL Server instance are created in different nodes. Then apply Active /Active configuration of both instance. There is an example about creating an Active/Active SQL Cluster using Hyper-V. you can review the
following article.
http://blogs.msdn.com/b/momalek/archive/2012/04/11/creating-an-active-active-sql-cluster-using-hyper-v-part2-the-clustered-instances.aspx
Regards,
Sofiya Li
Sofiya Li
TechNet Community Support

Sql server replication server SLOW

My team has been troubleshooting this for months now. Sql Server 2008 r2
Our Main DB & server is on "server A" and is a physical machine with a single virtual instance on it, it does not share with anyone, it has its own physical hard drives and has 20 gb memory and hosts our 1 terabyte DB and is very fast which
is perfect. It performs nightly loads of data which users access throughout the day. it is not a transactional db, more of a data warehouse db.
our second sql server, "Server B", has the exact same specs, actually we doubled the memory since it was slow to 40 gb memory and its still 4 times slower than server A!!! only difference is the hard drive is on a SAN, which I am told is
state of the art, fast, etc...
we setup replication on ServerA to replicate to ServerB. The distribution DB is on ServerB as well.
We did a test where we shut down the distribution DB since it seems like that takes up about 30% of the cpu usage, and the queries we ran are still 4 times slower!
Our next step is we are going to try and put the Distribution DB which is on ServerB on its own volume.
and then next step is to try and put Server B on its own server (not sharing with any other companies) with its own physical hard drives like server A is.
Can anyone offer some insight, help, thoughts, etc. thank you.

Hi Hilary,
This is most likely due to IO. SANs are NOT all the same. Typically you should not use ISCI for SQL Server deployments. As the number of NICs required, the number of HOPs, management, network configuration and server configuration can be difficult
to align and defend in support of SQL Server deployments. Note: this is true of ALL database servers..
However, the first thing you need to do in order to identify if there are any Disk Related IO Bottlenecks is to collect performance metrics on the 2 environments. Start with Server A and then implement the same performance counters on Server B then perform
the 4 queries capture the information from both servers and compare.
Data to Collect
There are numerous counters available in perfmon. We recommend that you collect data from the following counters when you are analyzing characteristics of a SQL Server workload. These disk-specific counters are listed under the LogicalDisk
section of the available counters. (The PhysicalDisk counter object may show the same values if there is a 1:1 relationship between a logical volume and disk.) The LogicalDisk object reports volume letters or mount point names (rather than disk numbers) and
it can provide a finer level of granularity if there are multiple volumes on a single Windows disk.
Counter Description LogicalDisk Perfmon Object
Disk Reads/sec - Disk Writes/sec = Measures the number of IOPs.You should discuss the expected IOPs per disk for different type and rotational speeds with your storage hardware vendor.
Typical sizing at the per disk level are listed below:
10K RPM disk – 100 to 120 IOPs
15K RPM disk – 150 to 180 IOPs
Enterprise-class solid state devices (SSDs) 5,000+ IOPs
Average Disk sec/ Average Disk sec/Write = Measures disk latency. Numbers vary, but here are the optimal values for averages over time:
1 - 5 milliseconds (ms) for Log (ideally 1 ms or less on average)
Note: For modern storage arrays, log writes should ideally be less than or equal to 1-2 ms on average if writes are occurring to a cache that guarantees data integrity (that is, battery backed up and mirrored). Storage-based replication and disabled write
caching are two common reasons for log latencies in the range of 5 or more milliseconds.
5 - 20 ms for Database Files (OLTP) (Ideally 10 ms or less on average)
Less than or equal to 25-30 ms for Data (decision support or data warehouse)
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configuration is being realized. SQL Server scan activity (read-ahead operations) issues transfer sizes up to 512K, and it may push a large amount of outstanding requests to the storage subsystem. If the realized throughput is reasonable for the particular
configuration, higher latencies may be acceptable for heavy workload periods.
If SSD is used, the latency of the transfers should be much lower than what is noted here. It is not uncommon for latencies to be less than 5 ms for any data access. This is especially true of read operations.
Average Disk Bytes/Read - Average Disk Bytes/Write = Measures the size of I/Os being issued. Larger I/Os tend to have higher latency (for example, BACKUP/RESTORE operations issue 1 MB transfers by default).
Current Disk Queue Length = Displays the number of outstanding I/Os waiting to be read or written from the disk. Deep queue depths can indicate a problem if the latencies are also high. However, if the queue is deep, but latencies are low
(that is, if the queue is emptied and then refilled very quickly), deep queue depths may just indicate an active and efficient system. A high queue length does not necessarily imply a performance problem.
Note: This value can be hard to interpret due to virtualization of storage in modern storage environments, which abstract away the physical hardware characteristics; this counter is therefore limited in its usefulness.
Disk Read Bytes/sec - Disk Write Bytes/sec = Measures total disk throughput. Ideally larger block scans should be able to heavily utilize connection bandwidth. This counter represents the aggregate throughput at any given point in time.
SQL Server Buffer Manager Perfmon Object = The Buffer Manager counters are measured at the SQL Server instance level and are useful in characterizing a SQL Server system that is running to determine the ratio of scan type activity to seek
activity.
Checkpoint pages/sec = Measures the number of 8K database pages per second being written to database files during a checkpoint operation.
Page Reads/sec = Pages reads/sec measures the number of physical page reads being issued per second.
Readahead pages/sec = Read-ahead pages/sec measures the number of physical page reads that are performed using the SQL Server read-ahead mechanism. Read-ahead operations are used by SQL Server for scan activity (which is common for data
warehouse and decision support workloads). These can vary in size in any multiple of 8 KB, from 8 KB through 512 KB. This counter is a subset of Pages reads/sec and can be useful in determining how much I/O is generated by scans as opposed to seeks in mixed
workload environments.
Cheers,
-Ivan

SQL SERVER USERS

Hello Experts
How can we list all sql server users(active or inactive) with the respective rights in a server? i was told to list all users and their rights on a hard copy, thank you as ususa!

-- selects out logins in instance
select name,
dbname
from sys.syslogins
-- selects out users and groups that has access to specific database
-- ...must be run per database in instance
select status,
name,
hasdbaccess,
* from
sys.sysusers
where status
in (4,12)
-- 4 = group, 12 = login
and hasdbaccess
= 1
I am sure that there must be a more handsome way of doing it.... :-)

Install Guide - SQL Server 2014, Failover Cluster, Windows 2012 R2 Server Core

I am looking for anyone who has a guide with notes about an installation of a two node, multi subnet failover cluster for SQL Server 2014 on Server Core edition

Hi KamarasJaranger,
According to your description, you want configure a SQL Server 2014 Multi-Subnet failover Cluster on Windows Server 2012 R2. Below are the whole steps for the configuration. For the detailed steps about the configuration, please download
and refer to the
PDF file.
1.Add Required Windows Features (.NET Framework 3.5 Features, Failover Clustering and Multipath I/O).
2.Discover target portals.
3.Connect targets and configuring Multipathing.
4.Initialize and format the Disks.
5.Verify the Storage Replication Process.
6.Run the Failover Cluster Validation Wizard.
7.Create the Windows Server 2012 R2 Multi-Subnet Cluster.
8.Tune Cluster Heartbeat Settings.
9.Install SQL Server 2014 on a Multi-Subnet Failover Cluster.
10.Add a Node on a SQL Server 2014 Multi-Subnet Cluster.
11.Tune the SQL Server 2014 Failover Clustered Instance DNS Settings.
12.Test application connectivity.
Regards,
Michelle Li

SQL Server Failover Cluster Questions

Dear All,
            I am building a two-node failover cluster on SQL Server 2012 SP1 (inside Hyper-V as a Guest Cluster) and want clarification on few things that I am facing.
1.  I am receiving MSDTC Warning. I can go ahead and create the cluster, but want to understand whether this MSDTC is to be configured as a role on the cluster or not. I plan to run SCVMM, SCOM, Orchestrator and Windows Azure Pack Databases
and Reports through it so in such a scenario, do I need MSDTC? If yes, how much should be the size of the MSDTC Drive? Is following process correct?
http://www.sqlnotebook.info/configure-msdtc-on-windows-cluster-2012/
2. During First Node configuration, one needs to provide the "SQL CLUSTER RESEOURCE GROUP NAME". Does it have any bearing on how it will be accessed by other servers for databases and logs? or is it just how the cluster resource group
would be named? would it be required for every instance that is created inside the cluster? Just to be clear, so one can name it according to the instance name.
3. During the instance creation, one needs to provide "SQL Server Network Name". As stated above, I plan to run SCVMM, SCOM, Orchestrator and Windows Azure Pack Databases and Reports through it, so would I be required to provide this
for all instances that I create or this is only required once in the cluster:
4. During the instance creation, one needs to provide the features required for installation i.e. instance features and shared features. As stated above, I plan to run SCVMM, SCOM, Orchestrator and Windows Azure Pack Databases and Reports through
it, so which features should be selected? so that there is less workload on the server.
5. All the instances use TempDB for databases that are present inside it. What would be the best practice with respect to TempDB. One TempDB for all instance on the servers on a separate LUN or all instance having their own TempDB LUN?  What
should be the ideal size of the TempDB LUN?
6. Should all the disks required for DBs and Logs be added to Cluster?  Should they be added normal disks or CSV Volumes?
Thanks in advance.

Hello,
1.You can run the Microsoft Distributed Transaction Coordinator service (MSDTC) as a clustered resource on a failover cluster server for increased reliability, based on the failover capabilities of the clustered servers. You can
refer to the MSDTC section of the following blog about determine whether the Microsoft Distributed Transaction Coordinator (MSDTC) cluster resource must be created.
Reference:http://msdn.microsoft.com/en-us/library/ms189910.aspx#MSDTC
2. The Cluster Resource Group is where SQL Server failover cluster resource will be placed. Each clustered SQL Server will belong to a Failover
Cluster Resource Group. For example, if you had configure a two node SQL Server Cluster, each clustered instance on the two node belong to a same Cluster Resource Group.
You can change the Cluster Resource Group name, but notes the following name is reserved and already used as Resource Group names: Available Storage, Cluster Group.
3. Each SQL Server cluster is assigned a virtual Network name and IP address, which client applications use to connect to the clustered SQL Server.
4. Not familiar with SCVMM, SCOM, Orchestrator, but you should install the Database Engine Services and SQL Server Management tools.If you want to use SQL Server Reporting Services, you can install Reporting Servers, but Report Server service cannot participate
in a failover cluster.
5. You can use isolated disk for user database and temp DB of each SQL Server Cluster
6. Yes. You should use Cluster Disks which add to Clustered Shared Volumes to host the data file and log of databases.
http://www.pythian.com/blog/how-to-install-a-clustered-sql-server-2012-instance-step-by-step-part-1/
Regards,
Fanny Liu
Fanny Liu
TechNet Community Support

SQL server active/active clustering

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