Auto Failover Issues
May 22, 2007
I have been looking over the forum, and also other sites for information about my problem but cant seem to find what im looking for so I have decided to make a quick post.
Presently, I have 3 computers setup for mirroring. One is the principal, another the mirror and the third is the witness.
Im using SQL 2005 Enterprise Edition on all three, and creation of the mirror using SQL Studio works without problems. Manual failover (using the button in SQL Studio) also works fine.
When I start the "Mirror Monitor" application, and connect to the two DB servers the status is all green, they are connected to each other and the witness server can be contacted.
Now here is my issue; when its time for an automatic failover situation (pulling the plug from the current principal for example) it detects the fault and changes the status of the mirror to "principal" BUT keeps the other status to "Disconnected" (Principal, Disconnected) so no active connections to the failed over database will work.
When running the mirror monitor during the failed fail-over attempt the still online database reports that the connection to the witness is still present but the mirror is offline.
There are a few error notices in the logs, but from what I can tell they are normal for whats happening. But the codes would be 1479 (cant talk to the database; this would be the one we took offline) and 1474 (network name is no longer available; once again as it was taken offline). Note that these errors are also in the witness server logs, as I believe one should expect.
Any help or assistance with this problem would be appreciated.
Thanks,
Sean
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May 13, 2008
Hi all,
Is it possible to setup auto-autofailower on 2 servers? Do i need to setup a witness on each server or what?
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Mar 12, 2015
I have a 2-node Windows Cluster and File Share Witness with an availability group. The cluster is set to sync and auto failover. I'm using SQL 2014 and Windows 2012R2. I'm trying to understand the steps to apply Windows Updates that require a restart. Are the steps something like this where ServerA is the primary replica and ServerB is the secondary replica.
Apply updates to ServerB.
Restart ServerB.
Fail ServerA availability group to ServerB using ALTER AVAILABILITY GROUP MyAvailGroup FAILOVER;. Server B is now the primary.
Apply updates to ServerA.
Restart ServerA.
Fail ServerB availability group to ServerA using ALTER AVAILABILITY GROUP MyAvailGroup FAILOVER;. Server A is now the primary.
What I don't understand is where Drain Roles on the Failover Cluster Manager fits in?
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Jun 7, 2015
I Config Ha-Alwayson on 2 test servers . In addition, was defined a listener for them.i can connect to them from the listener and in directly. I did manual Failover and it worked.However all connection to all servers (primary and secondary and listener) was breaked. I expected my connection To The listener, be stable. But How can I test the Auto failover mechanism? I run this scenario :
1- I filled all free space from the primary server else a bit.
2- And run on it a Huge Update to fill remain free space.
3- MeanWhile I Run an insert command into listener IP. (in a while Loop)
I expected :
>>> After run update or in middle of it , The primary server face to a problem. (Full Log file). And This was happened.
>>> After I expected The Failover act and change Primary And Secondary.And My insert commands Continues without Break Or Continue On new server After some Seconds
But It didn't Happend.Both Of 2 Command are stoped !!!!! And auto failover didnt act. I tryed To create a manual fail on primary server . I Tried to Offline the main database in primary server.
Then
1- What is the meaning Of fail that Auto failover act about it ?
2- In which scenario I can Test It ?
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Apr 9, 2015
We have 2 data centers, site 1 and site 2. Â Site 1 is generally our primary, and site 2 is our Disaster Recovery (DR) site. Â I want to setup a SQL instance to have extremely high availability. Â Therefore I was looking at using DB mirroring, with synchronous data writing, high-safety and auto-failover. Â This requires the usage of a witness server.My problem with this setup, is that if the witness and principal are both at site 1, if site 1 goes away (power failure, asteroid impact, lol, anything else that would be a *true* DR scenario), then there is no failover to the mirror server at site 2. Â However, if you put the witness at site 2, anytime the WAN link between site 1 and site 2 has an issue, the DB will auto-failover to site 2. Â Is the reason for the recommendation of the witness being at the primary site because the thinking is that WAN link failure is likely more common than a *true* DR scenario that takes out all of site 1?
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Oct 29, 2015
1. Once fail over to secondary replica, what will happen to connected session in primary node? can the session fail over to secondary seamlessly or need to re-login. what happen committed transactions which has not write to disk.
2. Assume I have always on cluster with three nodes, if primary fails, how second node make write/ read mode.
3. after fail over done to 2nd secondary node what mode in production(readonly or read write).
4. how to rollback to production primary ,will change data in secondary will get updated in primary.
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Mar 3, 2007
We have set up Mirroring with a witness server and everything works fine when we failover from the SQL Management console.
However, if we failover when our Maccola client is connected, the client blows up - clearly because it can no longer connect to the database.
The ODBC DSN used by the Maccola client shows a checkbox for the 'select a failover server' but the checkbox is grayed out.
Also the summary of settings for the DSN at the end of the wizard reveals that the failover to server (y/N) option is set to N.
The default setting for this DSN is 'populate the remaining values by querying the server' but it doesn't appear to be getting the settings for failover from the server or any other interactive DSN settings either. The server is clearly set for mirroring.
Another suspicious item is that the DSN cannot connect to the server with SA permissions, even though the server is set to mixed security and we use the correct authentication.
Is it possible that the client MACHINE is not authenticating with the domain or sql server properly. We are logged into the client with the domain account that is the SQL admin account on the sql server box.
We should be able to interact with the sql server settings through the ODBC DSN on the client shoulnd't we?
Are we missing a service pack on the client?
Thanks,
Kimball
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Oct 29, 2015
1. In alwaysON fail over cluster, Once fail over to secondary replica, what will happen to connected session in primary node? can the session fail over to secondary seamlessly or need to re-login. what happen committed transactions which has not write to disk.
2. Assume I have always on cluster with three nodes, if primary fails, how second node make write/ read mode.
3. After fail over done to 2nd secondary node what mode in production(readonly or read write).
4. How to rollback to production primary ,will change data in secondary will get updated in primary.
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Feb 16, 2014
Since upgrading from SQL Server Management Studio 2008 R2, I've noticed that it no longer autosaves queries that have not been manually saved first. If a file has been manually saved the autorecover files end up in the following directory:
%appdata%MicrosoftSQL Server Management Studio11.0AutoRecoverDatSolution1
However, I have ended up in the situation where I have unsaved queries when my computer has crashed and have not been able to recover them.
I have also found references to .sql files stored in temp files in the following directory, but the files here seem to be very haphazardly caught:
%userprofile%AppDataLocalTemp
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Jan 23, 2004
I have an MS SQL Server table with a Job Number field I need this field to start at a certain number then auto increment from there. Is there a way to do this programatically or within MSDE?
Thanks, Justin.
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Jan 22, 2007
I have to figure out a way to handle a failover in SQL Server 2005. I was reading a few articles about it.
1. Do I need to do anything in application layer to let a failover occur in SQL Server 2005
2. I have a web site that connects to a production server, the connection string is defined in web.config. If I implement Mirroring in SQL Server 2005, and when failover occurs, shouldn’t I change the connection string to point the application to the new server?
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Oct 2, 2007
Hi I just set up a new cluster and everything was working. Now when I try to test failovers like unplug the public network card etc...
The cluster group fails over correctly but my data and log array's dont failover.
So I unplug the network cable from node 1 (active) the cluster group with the IP, name, and Quorum disk fails over to node 2 but the other groups sql data and sql log stay on node1 and dont failover.
Any ideas?
TIA
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May 13, 2004
I have 4 servers, the first two are web app and load balanced the second two are to be configured for failover. Let us call them SvrA and SvrB. SvrA will have active SQL (2000EE) and passive Content (large directory of courses offered) SvrB will have passive SQL(2000EE) and active Content. Both SvrA and SvrB will be connected to a redundant SCSI 18 drive Drive bay (cheap SAN) which will be configured with a) mirrored OS drives, b) a RAID 5 partition for SQL and c) a RAID 5 partition for the content folders.
SvrA & SvrB will be quad processor machines. EE license for 4 processors as 2nd svr is failover for SQL.
My concern is the failover set up for the content portion, or is it the failure of the server that causes the failover? This is quite confusing to me.
Any thoughts would be most helpful.
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May 25, 2008
Hi there,
I am testing the db mirroring, making sure it will auto failover. I've stopped the SQL services on my principal and then I looked at the mirror db is says it's restoring. It stayed like that for 10 min before I enabled the mirroring again. Anyone knows why it's not failing over??????
Here's my setup: SQL 2005 Standard, Server 1 Principal, Server 2 Mirror & Witness.
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Mar 9, 2007
Hi all:
I was wondering what will happend to the transaction when the cluster failover from one node to another?
In my case the database is in node-001 and I need to restart the server on node-001. So I need to have the database failover to node-002, so I can work on node-001. During this process, will it effect to end-user?
Thanks
vua
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May 25, 2006
Is it possible to failover a single or a selected number of databasesonto a standby server? We're currently log shipping about 12 databasesto a standby and I was wondering if it was possible to randomlyfailover onto selected dbs.My understanding of log shipping is that when the primary server goesdown, the standby takes over. But, does that mean that all of the db'son the standby server now become the primary? Or, can failover occur onselected dbs?The reason I ask is because if one db on the primary, for example, wasto go down, I'd like to be able to bring the particular db on thestandby server online while I fix or restore what's on the primaryserver. Can it be done individually or is it an all or nothingscenario?Your personal advice or links is greatly appreciated.Thanks,Peps
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Jul 20, 2005
I have a 2 node Microsoft 2000 cluster with a shared storage device. Iwant to create automatic failover for MS SQL 2000 server. I can dothat wit the following options:1. Active/Pasive (one instance installed)2. Active/Active (More then one instance/virtual sql serversinstalled)I have a question about option 2.Is it possible to have more then one instance/virtual SQL server,service only one database for example loadbalancing. ?, or when youcreate multiple instances/virtual SQL servers, does that mean you havemultiple databases ? If not why does a Virtual SQL server has to betaken over by a cluster node that didnt fail. Then you can actuallyuse option 1. Please advise!The documentation is not very clear on this issues.Regards,Nico de Groot
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Oct 15, 2015
Could not able to connect secondary replica below is the error message I am getting when I tried to failover. Cannot connect to VLDBATEAM.
The secondary replica that you selected to become the new primary replica does not belong to the specified availability group. A possible explanation is that the replica has not been joined the availability group. Â (Microsoft.SqlServer.Management.HadrTasks)
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Jan 2, 2008
Hi there!
I use different udls for a website which is partly asp pages and partly aspx pages.
Every database is mirrored, so each udl indicates a "failover partner". However we decided recently that one of the database would not be mirrored anymore. For this database we still use in the udl a "failover partner" to redirect the connection to the second database in case of a failover. For the asp pages the failover works fine even if the database is not mirrored, but it doesn't work for the aspx pages.
It would be great if anyone had an idea why the behaviour is not the same for the aspx pages, and if we can still use a "failover partner" in udls even if the database is not mirrored.. if not, what should we use to connect to another database?
Any help is welcome!
idel
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Sep 13, 2006
How do I test failover to point to the mirrored database instead of the principal without having to stop the primary instance? I would like to just bring the mirrored database on the primary instance to an offline status and see that the same database on the mirrored instance getting activated as the primary. This does not happen if I try to put the database on the primary server "offline" as it complains that any database that is being mirrored cannot be taken offline.
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Feb 9, 2007
Our reports are connecting to a database snapshot for their data. Periodically this snapshot loads, which means for a minute or two the reports go down. There is however another snapshot available, and between the two one will always be up. Is there a way with Reporting Services to dynamically switch between the two, depending on which one is up? These snapshots are on a constant schedule, so it would also acceptible (but not as nice), to have the database connection automatically switch at certain times of the day.
These snapshots are on the same server, or I would try using a failover partner in the connection string. To the best of my knowledge, this only switches servers, not the database instances.
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Sep 5, 2007
We're planning on moving some applications to a SQL server. We're likely going to go with 64-bit for obvious reasons. Since these are critical apps, we plan on having a failover cluster set up. We're aware that all nodes in the cluster have to be 64-bit, if that's the way we decide to go.
The question is this: is there any "non-standard" way to have a 32-bit failover solution, perhaps via a 3rd party application? The only reason we're considering this is from a budget standpoint.
"Hurricane" Andrew
Milford, DE
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Jun 7, 2006
Hi,
I have successfully set-up a DB mirroring. When the pricipal goes down, the mirror picksup and the other way around too. So the mirroring part is working great. However, when I use my web applicaiton (dot net 2.0), it is not able to connect to Mirror server. I get the following error:
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
My connection string in web app:
"Server=serverAAA;Failover Partner=serverBBB;Database=TestDB;User Id=testUser;Password=testPassword;"
I have checked the surface are config on "serverBBB" and it is set to use tcpip only for remote connections.
Any suggestions are higly appreciated. TIA.
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Jan 23, 2007
I have to figure out a way to handle a failover in SQL Server 2005. I was reading a few articles about it.
1. Do I need to do anything in application layer to let a failover occur in SQL Server 2005
2. I have a web site that connects to a production server, the connection string is defined in web.config. If I implement Mirroring in SQL Server 2005, and when failover occurs, shouldn€™t I change the connection string to point the application to the new server?
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Jan 25, 2007
Hi there,
We've recently set up a Principle, Mirror and Witness configuration with the Mirror and Witness in a separate building to the Principle. All three are part of the same domain (DMZ) and are different servers, the buildings are connected via a fiber optic cable. All servers and SQL Server instances are logged in with the same domain admin account DMZesAdmin.
Mirroring is all set-up and the databases are synchronized. Every once in a while some (not all, normally 6 out of 15) databases will switch roles and become active on the mirror. The SQL Server mirroring monitor job then reports:
Date 25/01/2007 12:37:01
Log Job History (Database Mirroring Monitor Job)
Step ID 1
Server DMZSQL01
Job Name Database Mirroring Monitor Job
Step Name
Duration 00:00:02
Sql Severity 16
Sql Message ID 32038
Operator Emailed
Operator Net sent
Operator Paged
Retries Attempted 0
Message
Executed as user: DMZesadmin. An internal error has occurred in the database mirroring monitor. [SQLSTATE 42000] (Error 32038). The step failed.
I have no idea, what causes the failover, it could be a slow network or a bad set-up, can anyone give me some ideas of what to do to track down the problem or any experience of what could be causing this, it happens randomly every day or three. No warning and if I go to the mirror and failover back to the principle again then it's all just fine. However I don't want half my databases working on 1 server and half on the other.
Any ideas?
Thanks
Ed
UPDATE:
I've just been looking at the logs on my Mirror and at the same time it reports in this order
Error: 1479, Severity: 16, State: 1.
The mirroring connection to "TCP://DMZSQL01.dmz.local:5022" has timed out for database "WARCMedia" after 10 seconds without a response. Check the service and network connections.
Database mirroring is inactive for database 'WARCMedia'. This is an informational message only. No user action is required.
Recovery is writing a checkpoint in database 'WARCMedia' (41). This is an informational message only. No user action is required.
The mirrored database "WARCMedia" is changing roles from "PRINCIPAL" to "MIRROR" due to Failover.
Database mirroring is inactive for database 'WARCMedia'. This is an informational message only. No user action is required.
...
This looks like a time out, is there any way to set the TimeOut threashold for Database mirroring or set retry intervals??
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Feb 29, 2000
We need to start testing our Microsoft cluster servers.
Has anyone heard of any plan or products one can use to test
the failovers?
Please advise
Thanks
Susan
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Jul 16, 1999
I need to know if there are any other failover options available for SQL Server/NT, beyond Microsoft Clustered Services. If there are any, which ones are advised?
Thanks,
Jon
jon_waldow@emeraldsolutions.com
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Sep 24, 2002
Hi all,
We are the studying the possibilty of implementing SQL - Clustering for
Failover server.
Are there any third party tools readily available.
Any suggestion or checklist ??
Any suggestions or comments will be appreciated.
Thanks and have a great day.
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Dec 13, 2004
Question(s):
If you are using Legato to mirror your database server are you running any specialized scripts against the system tables at failover time? Are you running any kind of script at failover?
Background:
We are using Legato to mirror several of our critical database servers and it’s really worked well for us but a situation occurred last week that causes me some concern and I’d like to know what other Legator users are doing.
Normally our failovers are for short durations, a few hours at most. This time the failover occurred over several days. I found that any job that executed a step with a DTS package was failing.
It seems that there’s a documented issue from Microsoft, that when the originating_server column in the sysjobs table contained a value other than the name of the current server, the job fails. The fix was simple. I changed the originating_server name to the current server and all was well. When we went back to the primary server, I changed the value back again.
This brings me to the question about any special scripts or processes that you may be running at failover time. Any information you share is greatly appreciated.
Sidney Ives
Database Administrator
Sentara Healthcare
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Feb 15, 2006
This one is a needle in the haystack. I have a fairly robust Dell server running WIn 2003, 16 gig of memory, SQL SP3a using log shipping failing over to a local server and then back to my location across a WAN, using a vb6 app with about 60 users, a 24X7 shop Mon-Sat. 2 times in the past month the production server has created a corrupt log ship file which gets applied to my failover server and then corrupts the failover DB to both failover servers. Of course it is my 20 gig db and the only time I can recreate the failover is Saturday night. The production DB is not corrupt and is fine. Has anyone ever run into this before. Currently working with MS and Dell, but hoping someone had experience with this !
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Mar 10, 2014
If I have multiple servers in my AG group and set two of the secondaries to synchronous with auto failover, how do I control which one one of the two secondaries will become primary if the original primary goes down?We need to maintain HA even during patching so need a first choice auto failover and a second choice auto failover.
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Jun 5, 2008
Dear All,
we have one production server and continuously getting the data from application.
we have replication server with transactional replication for the main database.
so, for taking the data, we are using prod server, and for fetching the data, we are using replication server.
now what i'm expecting from you is, if something happend to the main server, there is no cluster except backup. what is the best plan for this?
and one more thing, if replication server fails, then the application will not fetch the data then what is the plan for this?
please give me a good plan for this kind of strategy.
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Aug 30, 2007
I'm sure this has been discussed in the forums before, but I'll ask anyways. I'm replacing our GP server next year to one that will run SQL2k5 64-bit. The current server is only capable of 32bit SQL. I know with some databases changing from x64 to x32 is a bad idea...will SQL Server support it?
Thanks
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