Fault tolerance and availability of SSAS Multidimentional Server

We have dedicated Azure VM for SQL Server 2014 SSAS.
What could be done for situation where error occurs with the SSAS server?
We would like to ensure that Power View reports on SharePoint 2013 are up and running.
Kenny_I

Hi Kenny_I,
In order to minimize downtime, you can troubleshoot this issue by using the Windows Event logs and msmdsrv.log.
You can access Windows Event logs via "Administrative Tools" --> "Event Viewer". SSAS error messages will appear in the application log.
The msmdsrv.log file for the SSAS instance that can be found in \log folder of the instance. (C:\Program Files\Microsoft SQL Server\MSAS10.MSSQLSERVER\OLAP\Log)
Here is a blog about data collection for troubleshooting Analysis Services issues, please see:
Data collection for troubleshooting Analysis Services issues
Besides, we can cluster SSAS. SSAS supports clustering natively. This is since 2008 R2. Meaning that, if Server1 dies, clients will automatically access Server2.
SSAS Cluster
Regards,
Charlie Liao
TechNet Community Support

Similar Messages

What is the difference with 1 Lync Standard Edition using VMware Fault Tolerant and 2 Lync Enterprise Edition in a cluster

Hi
As I will be planning to setup Lync on a virtual environment regardless if it is going to be the Standard or Enterprise edition.
I am thinking if we use 1 Lync Standard Edition for the FE Server with Fault Tolerance enabled, would it be as good as having 2 Lync Enterprise Edition in a cluster?
Thanks

Hi there,
the main difference between using Lync enterprise and lync standard is the High availability and scalability feature,
you will get fault tolrance setup with one lync standard edition running on whatever hyper-v and vmware platform, however this will not be an optimum highly available solution for the simple reason that upon a host server failure the image will move
to another available host server and users will lose their active session durin the move process.
on the other hand what you will gain if you the Enterprise edition is that you will have a unique identity to which all lync clients will be connecting and this identity is the lync pool identity which is in the background handled with multiple Front-End
servers and AV conferencing pools, mediation pools and so on.
In additioin when you have multiple front-ends in place, those front-ends will not work in active/passive mode as in a regular cluster, in contrairy all the servers will be active and handeling the work load.
hope i make it a bit clear, if yiu need more info i am ready
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread
Thanks for the response, being a small environment of 300 users, standard edition would be more than enough for me but the fact for HA is very critical for me at this stage. That is why I am exploring the option of using VMware FT.
I don't quick get what you mean on the users having to move to another image as my understanding of FT is in the event of a host failure (not VM failure like bluescreen etc), the VM will fail over to another host with no lost in any ping etc.
So, in theory, the Lync Server VM would never know that the parent ESX host had failed and it needed to failover to another host. Hope my understanding is correct.
Thanks

Fault tolerant, highly available BOSE XI R2 questions

Post Author: waynemr
CA Forum: Deployment
I am designing a set of BOSE XI R2 deployment proposals for a customer, and I had a couple of questions about clustering. I understand that I can use traditional Windows clustering to setup an active/passive cluster for the input/output file repositories - so that if one server goes down, the other can seamlessly pick up where the other left off. On this Windows-based active/passive cluster, can I install other BOSE services and will they be redundant, or will they also be active/passive. For example: server A is active and has the input/output file repository services and the Page Server. Server B is passive and also has the input/output file repository services and the Page Server. Can the page Server on B be actively used as a redundant Page Server for the entire BOSE deployment? (probably not, but I am trying to check just to make sure) If I wanted to make the most fault-tolerant deployment possible, I think I would need to:Setup two hardware load-balanced web front-end serversSetup two servers for a clustered CMSSetup two web application servers (hardware load-balanced, or can BOSE do that load-balancing?)Setup two Windows-clustered servers for the input/output file repositoriesSetup two servers to provide pairs of all of the remaining BOSE services (job servers, page servers, webi, etc.)Setup the CMS, auditing, and report databases on a cluster of some form (MS SQL or Oracle)So 10 servers - 2 Windows 2003 enterprise and 8 Windows 2003 standard boxes, not including the database environment.Thanks!

Post Author: jsanzone
CA Forum: Deployment
Wayne,
I hate to beat the old drum, and no I don't work for BusinessObjects education services, but all of your questions and notions of a concept of operations in regards to redundancy/load balancing are easily answered by digesting the special BO course "SA310R2" (BusinessObjects Enterprise XI R1/R2 Administering Servers - Windows). This course fully covers the topics of master/slave operations, BO's own load balancing operations within its application, and pitfalls to avoid. Without attending this course, I for one would not have properly understood the BusinessObjects approach and would've been headed on a collision course with disaster in setting up a multi-server environment.
Best wishes-- John.

CSM Fault Tolerance and IGMP Snooping

For "connection redundancy" the redundancy guide says to turn off IGMP snooping.
Is there any way around this?
I need to have multicasting everywhere and I don't want to multicast all streams to every port on this switch.

Most of the show statements are at the end of the attached file in an earlier post. The vservers details are at the end of this post.
I have an ARP entry for the VIP - 0001.64f9.1a64, but it does not respond to pings. I tried both the alias and the server vlan IP as the default gateway of the servers.
I took a trace and found that the VIP sends a TCP reset immediately after a request. I have tried versions 4.2.1 and 4.1.4 with the same result. I wonder if this could be a problem with the Sup720 with 12.2.17d IOS. I also tried the CSM in slots 2 and 3.
720Test2#sh mod csm 3 vserver detail
SOFTRICITY, type = SLB, state = OPERATIONAL, v_index = 10
virtual = 10.10.249.6/32:0 bidir, any, service = NONE, advertise = FALSE
idle = 3600, replicate csrp = none, vlan = ALL, pending = 30, layer 4
max parse len = 2000, persist rebalance = TRUE
ssl sticky offset = 0, length = 32
conns = 0, total conns = 1
Default policy:
server farm = SOFT1, backup =
sticky: timer = 0, subnet = 0.0.0.0, group id = 0
Policy Tot matches Client pkts Server pkts
(default) 1 1 0

Load balancing and fault tolerance in BPEL PM

BPEL documentation talks about the ability of clustering processes in BPEL PM Server for fault tolerance and Load balancing. Can anybody tell me how is it done?
Thanks

Have you seen these links?
http://www.oracle.com/technology/products/ias/hi_av/BPEL_HA_Paper.pdf
http://download-uk.oracle.com/docs/cd/B31017_01/integrate.1013/b28980/clusteringsoa.htm#CHDCGIEJ

Fault Tolerance - MCS 7825 H3 & MCS 7835 H2 Servers

Hi,
I have enabled network fault tolerance on my CUC and CCM Servers, i thought after enabling the network fault tolerance the server would change the mac address to Virtual mac address which indeed it may affect the licenses.
But after enabling fault tolerance and restarting the server also i didn't see any change in the MAC ID. Its the same MAC ID.
Pls advice.
Regards
Jagadish G

Hi Jagadish,
do u get the option of 1000 MB/s when u configure set network nic eth0 speed ? can u check?
secondly, Bond 0 would be showing Auto disabled which cannot be changed.
Can u share snapshot of show netowrk failover?
regds,
aman

Fault Tolerance in OVM ?

Hi Experts
Is there any fault tolerance feature available in OracleVM, something similar to the VMWare's fault tolerance feature? Or is it going to be included in future release ?
Rgds.

Hi,
have you also looked at the restrictions this FT feature has? As far as my information goes it can only be used with 1 CPU, not to mention the overhead it produces, since all instructions have to be executed on 2 nodes.
Also this feature only helps you if your whole guest system crashes. What if your software inside the VM crashes? It will not run in both environments.
If you are looking for real HA (in virtualized environments), I suggest using RAC in OVM. It will get you down to 30 seconds but will do far better regarding functionality.
Sebastian

Gateway Fault Tolerance/Detection

Hello,
Does the ADSI Gateway Service have any fault tolerance and/or fault detection capabilities built into JSIM 6.0? Just because there is an 'active' listener on tcp/ip port doesn't mean that the service is functional. If the gateway is unable to reach the DC, but is still listening, will it notify, attempt to repair the connection, fail itself, or what, if anything, does it do if none of the above?

Yes 6.0 supports the fail over between different DC's even when you have active sync configured.
It will also timeout an authentication request if it does not get anything back from the DC machine when used in pass through.
WilfredS

UOO sequencing along with WLS high availability cluster and fault tolerance

Hi WebLogic gurus.
My customer is currently using the following Oracle products to integrate Siebel Order Mgmt to Oracle BRM:
* WebLogic Server 10.3.1
* Oracle OSB 11g
They use path service feature of a WebLogic clustered environment.
They have configured EAI to use the UOO(Unit Of Order) Weblogic 10.3.1 feature to preserve the natural order of subsequent modifications on the same entity.
They are going to apply UOO to a distributed queue for high availability.
They have the following questions:
1) When during the processing of messages having the same UOO, the end point becomes unavailable, and another node is available in order to migrate, there is a chance the UOO messages exist in the failed endpoint.
2) During the migration of the initial endpoint, are these messages persisted?
By persisted we mean that when other messages arrive with the same UOO in the migrated endpoint this migrated resource contains also the messages that existed before the migration?
3) During the migration of endpoints is the client receiving error messages or not?
I've found an entry on the WLS cluster documentation regarding fault tolerance of such solution.
Special Considerations For Targeting a Path Service
When the path service for a cluster is targeted to a migratable target, as a best practice, the path
service and its custom store should be the only users of that migratable target.
When a path service is targeted to a migratable target its provides enhanced storage of message
unit-of-order (UOO) information for JMS distributed destinations, since the UOO information
will be based on the entire migratable target instead of being based only on the server instance
hosting the distributed destinations member.
Do you have any feedback to that?
My customer is worry about loosing UOO sequencing during migration of endpoints !!
best regards & thanks,
Marco

First, if using a distributed queue the Forward Delay attribute controls the number of seconds WebLogic JMS will wait before trying to forward the messages. By default, the value is set to −1, which means that forwarding is disabled. Setting a Forward Delay is incompatible with strictly ordered message processing, including the Unit-of-Order feature.
When using unit-of-order with distributed destinations, you should always send the messages to the distributed destination rather than to one of its members. If you are not careful, sending messages directly to a member destination may result in messages for the same unit-of-order going to more than one member destination and cause you to lose your message ordering.
When unit-of-order messages are processed, they will be processed in strict order. While the current unit-of-order message is being processed by a message consumer, the next message in the unit-of-order will not be delivered unless it is to the same transaction or session. If no message associated with a particular unit-of-order is processing, then a message associated with that unit-of-order may go to any session that’s consuming from the message’s destination. This guarantees that all messages will be processed one at a time and in order, and any rollback or recover will not prevent ordered processing of the messages.
The path service uses a persistent store to save the state of which member destination a particular unit-of-order is currently using. When a Path Service receives the first message for a particular unit-of-order bound for a distributed destination, it uses the normal JMS load balancing heuristics to select which member destination will handle the unit and writes that information into its persistent store. The Path Service ensures that a new UOO, or an old UOO that has no messages currently on any destination, can be enqueued anywhere in the cluster. Adding and removing member destinations will not disrupt any existing unit-of-order because the routing decision is made dynamically and those decisions are persistent.
If the Path Service is unavailable, any requests to create new units-of-order will throw the JMSOrderException until the Path Service is available. Information about existing units-of-order are cached in the connection factory and destination servers so the Path Service availability typically will not prevent existing unit-of-order messages from being sent or processed.
Hope this helps.

Fault tolerant server on SLES?

Hi,
How would you go go about setting up a fault tolerant suse file server? Id like to mirror the edirectory and the primary NSS shares to another server. Is there a suse equivalent method of widows server active directory replication and distributed file system? Currently running SLES 10 SP3.
Thanks

On 20/03/2014 23:16, ataubman wrote:
> You say SLES but you've posted in OES ... which is it?
I suspect OES since eDirectory and NSS also mentioned. Perhaps at0mic
can post the output from "cat /etc/*release" so we know.
> But as a general answer clustering is probably what you're looking for.
If OES then look at Novell Cluster Services but if SLES then High
Availability Extension.
HTH.
Simon
Novell Knowledge Partner
If you find this post helpful and are logged into the web interface,
please show your appreciation and click on the star below. Thanks.

Fault tolerance client /server

hi
i use a very basic client/server socket program
very similar to sun:
http://java.sun.com/docs/books/tutorial/networking/sockets/clientServer.html
many client can connect to the server...
i would like to add a fault tolerance...
a client try to connect a few time... that don't work, the client try to the second server...
does a need to do something similar to
public class KKMultiServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket1 = null;
        ServerSocket serverSocket1 = null;
        boolean listening = true;
        try {
            serverSocket = new ServerSocket(4444);
            serverSocket = new ServerSocket(4445);
        } catch (IOException e) {
            System.err.println("Could not listen on port.");
            System.exit(-1);
        while (listening){
         new KKMultiServerThread(serverSocket1.accept()).start();
            new KKMultiServerThread(serverSocket2.accept()).start();
        serverSocket1.close();
        serverSocket2.close();
}thanks

i need your help to finis my code
what i want to do is to create to start 2 tread of server in my class main server....
and each class server start a thread for each connection...
each time a client do a request, i count it
theses method is in server class
import java.net.*;
import java.io.*;
public class ServerMain {
    public static void main(String[] args) throws IOException {
         //will call 2 time server here
         Server server1 = new Server();
         Server server2 = new Server();
         server1(4444).start();
         server2(4445).start();
import java.net.*;
import java.io.*;
public class Server extends Thread{
    private static int nbRequete=0;
    public synchronized int ajouterRequete(){
        return nbRequete++;
    public synchronized int getRequete(){
        return nbRequete;
    public int port=0;
    public Server(int port) {
        super("Server");
        this.port = port;
    public void run() {
        ServerSocket serverSocket = null;
        Socket s=null;
        boolean listening = true;
       // Server server = new Server();
       // int port;
        try {
             //will put a port variable
            serverSocket = new ServerSocket(port);
            s=serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Could not listen on port.");
            System.exit(-1);
        System.out.println("server run, wait connecting....");
        while (listening)
            new ServerThread(s).start();
        //serverSocket.close();
import java.net.*;
import java.io.*;
public class ServerThread extends Thread {
    private Socket socket = null;
    public ServerThread(Socket socket) {
        super("ServerThread");
        this.socket = socket;
    public void run() {
        try {
            System.out.println("connexion successfull");
            System.out.println("Attente de l'entree.....");
            PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
            BufferedReader in = new BufferedReader(
                        new InputStreamReader(
                            socket.getInputStream()));
            String inputLine, outputLine;
            while ((inputLine = in.readLine()) != null) {
                System.out.println("Server: " + inputLine);
                inputLine = inputLine.toUpperCase();
                out.println(inputLine);
                if (inputLine.equals("Bye."))
                    break;
            out.close();
            in.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
}the server need to have different port
i'm a little bit confuse
i don't know how to finish this project
:confused:
i have some error i don't understand
ServerMain.java:11: cannot find symbol
symbol : constructor Server()
location: class Server
        Server server1 = new Server();
                         ^
ServerMain.java:12: cannot find symbol
symbol : constructor Server()
location: class Server
        Server server2 = new Server();
                         ^
ServerMain.java:13: cannot find symbol
symbol : method server1(int)
location: class ServerMain
        server1(4444).start();
        ^
ServerMain.java:14: cannot find symbol
symbol : method server2(int)
location: class ServerMain
        server2(4445).start();
        ^
4 errors

Experience VMware Fault Tolerance with Central Services/SRM for Appl Servs?

Hello all, I am looking for real-life experience of VMware Fault Tolerance enabled for SAP Central Services (ABAP/Java). FT is valid only for 1 vCPU VM's, therefor a probable good match with CS. Tips & trics are welcome.
If SRM is available, is it worthwhile to use it for protecting Application Servers in a dual datacenter? That way, the full capacity is guaranteed even after a disaster (resources should be available of course in the surviving DC).
So, are the VMware features like SRM and FT actually being used to protect SAP environments, and if yes, to any satisfaction?
Thanks in advance for your replies,
Roland

Hi Roland,
Did you finally use VMWare Fault Tolerance ? what has been your experience?
thanks,
Thomas

AGPM High Availability / Fault Tolerance

I’m looking for any informations about Advanced Group Policy Management (AGPM) High Availability / Fault Tolerance.
The most interesting is that, in introduction for AGPM Planning Guide is described section about
Planning for AGPM high-availability and improved fault tolerance, but content not exists.
Microsoft MVP: Virtual Machine | http://blog.porowski.pro |
http://VirtualizationGeek.PL

Hi,
You may type the key words into the bing of TechNet website to search for the information you need. According to my search,
the following two links inlcude the detailed information regarding AGPM. But less information regarding AGPM High Availability / Fault Tolerance can be found from TechNet website.
Advanced Group Policy Management 4.0 Documents
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=58FD6CDA-0210-4DA0-91D2-8C3CC2817DF8&displaylang=en
Advanced Group Policy Management
http://technet.microsoft.com/en-us/library/dd420466.aspx
Based on the current situation, I will also submit a feedback to Microsoft through our internal channel and requst more contents regarding
AGPM High Availability / Fault Tolerance to be published. While we cannot guarantee that these contents will be added, we would like to ensure you that we will make every effort to see that they do.
Arthur Li
TechNet Subscriber Support
in forum
If you have any feedback on our support, please contact
[email protected] .
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

(Cisco Historical Reporting / HRC ) All available connections to database server are in use by other client machines. Please try again later and check the log file for error 5054

Hi All,
I am getting an error message "All available connections to database server are in use by other client machines. Please try again later and check the log file for error 5054" when trying to log into HRC (This user has the reporting capabilities) . I checked the log files this is what i found out
The log file stated that there were ongoing connections of HRC with the CCX (I am sure there isn't any active login to HRC)
|| When you tried to login the following error was being displayed because the maximum number of connections were reached for the server . We can see that a total number of 5 connections have been configured . ||
1: 6/20/2014 9:13:49 AM %CHC-LOG_SUBFAC-3-UNK:Current number of connections (5) from historical Clients/Scheduler to 'CRA_DATABASE' database exceeded the maximum number of possible connections (5).Check with your administrator about changing this limit on server (wfengine.properties), however this might impact server performance.
|| Below we can see all 5 connections being used up . ||
2: 6/20/2014 9:13:49 AM %CHC-LOG_SUBFAC-3-UNK:[DB Connections From Clients (count=5)]|[(#1) 'username'='uccxhrc','hostname'='3SK5FS1.ucsfmedicalcenter.org']|[(#2) 'username'='uccxhrc','hostname'='PFS-HHXDGX1.ucsfmedicalcenter.org']|[(#3) 'username'='uccxhrc','hostname'='PFS-HHXDGX1.ucsfmedicalcenter.org']|[(#4) 'username'='uccxhrc','hostname'='PFS-HHXDGX1.ucsfmedicalcenter.org']|[(#5) 'username'='uccxhrc','hostname'='47BMMM1.ucsfmedicalcenter.org']
|| Once the maximum number of connection was reached it threw an error . ||
3: 6/20/2014 9:13:49 AM %CHC-LOG_SUBFAC-3-UNK:Number of max connection to 'CRA_DATABASE' database was reached! Connection could not be established.
4: 6/20/2014 9:13:49 AM %CHC-LOG_SUBFAC-3-UNK:Database connection to 'CRA_DATABASE' failed due to (All available connections to database server are in use by other client machines. Please try again later and check the log file for error 5054.)
Current exact UCCX Version 9.0.2.11001-24
Current CUCM Version 8.6.2.23900-10
Business impact Not Critical
Exact error message All available connections to database server are in use by other client machines. Please try again later and check the log file for error 5054
What is the OS version of the PC you are running and is it physical machine or virtual machine that is running the HRC client ..
OS Version Windows 7 Home Premium 64 bit and it’s a physical machine.
. The Max DB Connections for Report Client Sessions is set to 5 for each servers (There are two servers). The no of HR Sessions is set to 10.
I wanted to know if there is a way to find the HRC sessions active now and terminate the one or more or all of that sessions from the server end ?

We have had this "PRX5" problem with Exchange 2013 since the RTM version. We recently applied CU3, and it did not correct the problem. We have seen this problem on every Exchange 2013 we manage. They are all installations where all roles
are installed on the same Windows server, and in our case, they are all Windows virtual machines using Windows 2012 Hyper-V.
We have tried all the "this fixed it for me" solutions regarding DNS, network cards, host file entries and so forth. None of those "solutions" made any difference whatsoever. The occurrence of the temporary error PRX5 seems totally random.
About 2 out of 20 incoming mail test by Microsoft Connectivity Analyzer fail with this PRX5 error.
Most people don't ever notice the issue because remote mail servers retry the connection later. However, telephone voice mail systems that forward voice message files to email, or other such applications such as your scanner, often don't retry and
simply fail. Our phone system actually disables all further attempts to send voice mail to a particular user if the PRX5 error is returned when the email is sent by the phone system.
Is Microsoft totally oblivious to this problem?
PRX5 is a serious issue that needs an Exchange team resolution, or at least an acknowledgement that the problem actually does exist and has negative consequences for proper mail flow.
JSB

Welcome to the SQL Server Disaster Recovery and Availability Forum

(Edited 8/14/2009 to correct links - Paul)
Hello everyone and welcome to the SQL Server Disaster Recovery and Availability forum. The goal of this Forum is to offer a gathering place for SQL Server users to discuss:
Using backup and restore
Using DBCC, including interpreting output from CHECKDB and related commands
Diagnosing and recovering from hardware issues
Planning/executing a disaster recovery and/or high-availability strategy, including choosing technologies to use
The forum will have Microsoft experts in all these areas and so we should be able to answer any question. Hopefully everyone on the forum will contribute not only questions, but opinions and answers as well. I’m looking forward to seeing this becoming a vibrant forum.
This post has information to help you understand what questions to post here, and where to post questions about other technologies as well as some tips to help you find answers to your questions more quickly and how to ask a good question. See you in the group!
Paul Randal
Lead Program Manager, SQL Storage Engine and SQL Express
Be a good citizen of the Forum
When an answer resolves your problem, please mark the thread as Answered. This makes it easier for others to find the solution to this problem when they search for it later. If you find a post particularly helpful, click the link indicating that it was helpful
What to post in this forum
It seems obvious, but this forum is for discussion and questions around disaster recovery and availability using SQL Server. When you want to discuss something that is specific to those areas, this is the place to be. There are several other forums related to specific technologies you may be interested in, so if your question falls into one of these areas where there is a better batch of experts to answer your question, we’ll just move your post to that Forum so those experts can answer. Any alerts you set up will move with the post, so you’ll still get notification. Here are a few of the other forums that you might find interesting:
SQL Server Setup & Upgrade – This is where to ask all your setup and upgrade related questions. (http://social.msdn.microsoft.com/Forums/en-US/sqlsetupandupgrade/threads)
Database Mirroring – This is the best place to ask Database Mirroring how-to questions. (http://social.msdn.microsoft.com/Forums/en-US/sqldatabasemirroring/threads)
SQL Server Replication – If you’ve already decided to use Replication, check out this forum. (http://social.msdn.microsoft.com/Forums/en-US/sqlreplication/threads)
SQL Server Database Engine – Great forum for general information about engine issues such as performance, FTS, etc. (http://social.msdn.microsoft.com/Forums/en-US/sqldatabaseengine/threads)
How to find your answer faster
There is a wealth of information already available to help you answer your questions. Finding an answer via a few quick searches is much quicker than posting a question and waiting for an answer. Here are some great places to start your research:
SQL Server 2005 Books Onlinne
Search it online at http://msdn2.microsoft.com
Download the full version of the BOL from here
Microsoft Support Knowledge Base:
Search it online at http://support.microsoft.com
Search the SQL Storage Engine PM Team Blog:
The blog is located at https://blogs.msdn.com/sqlserverstorageengine/default.aspx
Search other SQL Forums and Web Sites:
MSN Search: http://www.bing.com/
Or use your favorite search engine
How to ask a good question
Make sure to give all the pertinent information that people will need to answer your question. Questions like “I got an IO error, any ideas?” or “What’s the best technology for me to use?” will likely go unanswered, or at best just result in a request for more information. Here are some ideas of what to include:
For the “I got an IO error, any ideas?” scenario:
The exact error message. (The SQL Errorlog and Windows Event Logs can be a rich source of information. See the section on error logs below.)
What were you doing when you got the error message?
When did this start happening?
Any troubleshooting you’ve already done. (e.g. “I’ve already checked all the firmware and it’s up-to-date” or "I've run SQLIOStress and everything looks OK" or "I ran DBCC CHECKDB and the output is <blah>")
Any unusual occurrences before the error occurred (e.g. someone tripped the power switch, a disk in a RAID5 array died)
If relevant, the output from ‘DBCC CHECKDB (yourdbname) WITH ALL_ERRORMSGS, NO_INFOMSGS’
The SQL Server version and service pack level
For the “What’s the best technology for me to use?” scenario:
What exactly are you trying to do? Enable local hardware redundancy? Geo-clustering? Instance-level failover? Minimize downtime during recovery from IO errors with a single-system?
What are the SLAs (Service Level Agreements) you must meet? (e.g. an uptime percentage requirement, a minimum data-loss in the event of a disaster requirement, a maximum downtime in the event of a disaster requirement)
What hardware restrictions do you have? (e.g. “I’m limited to a single system” or “I have several worldwide mirror sites but the size of the pipe between them is limited to X Mbps”)
What kind of workload does you application have? (or is it a mixture of applications consolidated on a single server, each with different SLAs) How much transaction log volume is generated?
What kind of regular maintenance does your workload demand that you perform (e.g. “the update pattern of my main table is such that fragmentation increases in the clustered index, slowing down the most common queries so there’s a need to perform some fragmentation removal regularly”)
Finding the Logs
You will often find more information about an error by looking in the Error and Event logs. There are two sets of logs that are interesting:
SQL Error Log: default location: C:\Program Files\Microsoft SQL Server\MSSQL.#\MSSQL\LOG (Note: The # changes depending on the ID number for the installed Instance. This is 1 for the first installation of SQL Server, but if you have mulitple instances, you will need to determine the ID number you’re working with. See the BOL for more information about Instance ID numbers.)
Windows Event Log: Go to the Event Viewer in the Administrative Tools section of the Start Menu. The System event log will show details of IO subsystem problems. The Application event log will show details of SQL Server problems.

hi,I have a question on sql database high availability. I have tried using database mirroring, where I am using sql standard edition, in this database mirroring of synchronous mode is the only option available, and it is giving problem, like sql time out errors on my applicatons since i had put in the database mirroring, as asynchronous is only available on enterprise version, is there any suggestions on this. thanks ---vijay

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