Recovery :: AlwaysOn Cluster Reboot Due To File Share Witness Unavailability
Apr 23, 2015
Came across this scenario in AlwaysOn Availability Group (two node), file share witness times out and RHS terminate and cause the cluster node to reboot. File share witness is for continuous failover and if the resource is unavailable my expectation was that it should go offline and should not impact Server or Sql Server. But its rebooting the cluster node to rectify the issue.
Configuration
Windows Server 2012 R2 (VMs)
Sql Server 2012 SP2
Errors
A component on the server did not respond in a timely fashion. This caused the cluster resource 'File Share Witness' (resource type 'File Share Witness', DLL 'clusres2.dll') to exceed its time-out threshold. As part of cluster health detection, recovery actions will be taken. The cluster will try to automatically recover by terminating and restarting the Resource Hosting Subsystem (RHS) process that is running this resource. Verify that the underlying infrastructure (such as storage, networking, or services) that are associated with the resource are functioning correctly.
The cluster Resource Hosting Subsystem (RHS) process was terminated and will be restarted. This is typically associated with cluster health detection and recovery of a resource. Refer to the System event log to determine which resource and resource DLL is causing the issue.
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May 31, 2015
Is it alright to move the .bak and .trn backups which are automatically created in a File Share Witness when a DB is added to an Availability Group? I did that and there were error IDs 1069 occurring, and the AG was unable to be brought up whenever I run a load intensive batch job ...
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Oct 12, 2015
I've set up a SQL server 2014 cluster with AlwaysOn availability groups. Upon creating the AG i opted for full syncronisation to a specific SMB share.Now i want to change that share because it has to move to a new server. How can i do that? I found no settings in the SSMS for that.
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May 29, 2015
We have several Sql Server 2014 AlwaysOn Availability Groups set up in our test lab and use a combination of SCDPM and Maintenance Plans to back up the databases in them.
Our applications always work well regardless of which of the physical servers are, at any given time, designated the "Primary" for a database. Automatic failover works fine.
There are other applications, such as SQL Server built-in backup and System Center DPM that only work properly when the databases are currently hosted where originally intended.
During the normal course of Windows Updates, etc., machines will occasionally be rebooted in the middle of the night. When they come back up, we would like them to "reclaim" the databases that properly belong to them, in an orderly fashion of course (when the "Synchronization State = Sychronized"). We have lots of these test servers and we do not have staff watching the servers in the middle of the night.
Is there an automatic way to accomplish this?
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Aug 17, 2015
We have a requirement to build SQL environment which will give us local high availability and disaster recovery to second site. We have two sites- Site A & Site B. We are planning to have two nodes at Site A and 2 nodes at Site B. All four nodes will be part of same Windows failover cluster. We will build two SQL Cluster, InstanceA will be clustered between the nodes at Site A Server and InstanceB will be clustered between the nodes at Site B, we will enable Always On Between the InstanceA and InstanceB and will be primary owner where data will be written on InstanceA and will be replicated to InstaceB. URL....Now we want we will have instanceC on the Site B and data will be writen from the application available on Site B, will be replicated to the instance on the Site A as replica.
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Jun 19, 2015
My environment has a 4 node cluster , 2 in primary and 2 in sec dc. Storage is sperate for both.
Need to setup always on for 4 Instances there on the 2 nodes of the primary dc. Is there any restriction in setting up always on for multiple instances for a cluster.
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Aug 14, 2015
I have had a serious issue with a production AlwaysOn cluster whereby the service did not successfully transition to the secondary node and I cannot find the root cause of the issue.
Some details: It is a 2 node cluster (same datacenter) with a shared disk quorum, Windows Server 2012, both are virtual machines running on VMWare vSphere 5.5. SQL Server version is 2012 Enterprise SP2 CU6
The failover occurred because of a network incident (a spanning tree recalculation caused a connection timeout between both nodes). Initial entries in the SQL Log look normal for this event, for example:
05/08/2015 11:18:06: A connection timeout has occurred on a previously established connection to availability replica 'FIN-IE-PA078' with id [6910F4A9-87E7-4836-BA79-0F41BE90266D]. Either a networking or a firewall issue exists or the availability replica has transitioned to the resolving role.
05/08/2015 11:18:06: AlwaysOn Availability Groups connection with secondary database terminated for primary database 'UserManagement' on the availability replica with Replica ID: {6910f4a9-87e7-4836-ba79-0f41be90266d}. This is an informational message only. No user action is required.
[code]....
My interpretation of this is that the cluster failover attempts failed, because the network condition still persisted. The network interruption lasted approximately 2 minutes, and I would have expected the cluster to come back online at this point, after the restart delay period as suggested in the last entry in the error log. However this did not happen.
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Jun 30, 2015
we have to build high availability SQL 2012 cluster for VDI and we have two options. One option is to build a server cluster with combination of failover and mirroring and other option is to build failover cluster with AlwaysOn.We are not sure which option to chose. We have contacted Microsoft support to provide us some documents and instructions for failovermirroring combination but they have send us instructions for AlwaysOn option.
What would be best way to build high availability cluster for VDI? Also, since first option is very complicated.
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Sep 5, 2012
I have a 3-nodes AlwaysOn cluster (Windows Server 2008 R2 SP1 + SQL Server 2012 RTM), Node Majority quorum, the quorum vote for each node is 1.
Today the AlwaysOn AG was suddenly down due to the cluster service on node 1 stopped and can't be started.
The error in eventlog is -
The cluster database could not be loaded. The file may be missing or corrupt. Automatic repair might be attempted.
The Cluster Service service terminated unexpectedly. It has done this 2 time(s). The following corrective action will be taken in 120000 milliseconds: Restart the service.
The failover cluster database could not be unloaded. If restarting the cluster service does not fix the problem, please restart the machine.
The Cluster Service service terminated with service-specific error The system cannot find the file specified..
The error log in cluster log is -
0000156c.000008f8::2012/09/05-08:09:36.057 INFO [DM] Key RegistryMachineCluster.restored does not appear to be loaded (status STATUS_OBJECT_NAME_NOT_FOUND(c0000034))
0000156c.000008f8::2012/09/05-08:09:36.057 WARN [DM] Node 1: Failed to unload restored hive from the registry with error STATUS_INVALID_PARAMETER(c000000d)
0000156c.000008f8::2012/09/05-08:09:36.057 INFO [DM] Node 1: loading local hive
0000156c.000008f8::2012/09/05-08:09:36.057 ERR [DM] Node 1: failed to unload cluster hive, error 2.
Now the cluster service can't be started on node 1, error code 2. Looks like the clusdb in C:windowscluster is missing or corrupted. How to restore the clusdb file? And how to prevent this happen again?
All nodes were well patched, AlwaysOn and cluster related hotfixes were all installed. [URL] .... doesn't wok.
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May 22, 2015
I'm getting an error adding Replica to SQL AlwaysOn failover cluster in the new availability group wizard. When I enter the name of the target node (secondary replica) server and press connect, I get the following:
A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2) The system cannot fine the file specified
The SQL Browser service is up and running on the target. I am using an Azure VM for my SQL instance. This cluster spans geographies from our on-premise site to Azure via a VPN. This is a multi-subnet cluster. I'm attempting to create a new AG from the primary replica node and the target is a node on Azure called SSASNodeAz03.
[URL]
Full error:
Connect to Server
Cannot connect to ssasnodeaz03
Additional information: A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2) The system cannot fine the file specified
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Oct 8, 2015
I have a Windows 2008 R2 Always on Cluster with 3 nodes (two in the primary site and one in the DR site).
Primary Site:
-Primary Site Server1
-Primary Site Server2
DR Site 1 (to be decommed):
-DR Site Server1
Our company is planning on decommissioning the DR site. But before we do this, we want to add a 4th site to the cluster. Migrate the data...and then decommission the original DR Site.
Is it possible to have this configuration:
Primary Site:
-Primary Site Server1
-Primary Site Server2
DR Site 1 (to be decommed):
-DR Site Server1
DR Site 2 (NEW DR Site):
-DR Site Server1
IF this is possible, do I simply add the new DR site to the existing cluster (same steps as adding the first DR node to the cluster when the cluster was originally configured? or are there special steps?
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May 27, 2015
I have getting issues when i am creating listener for always On . Error shown as below
Can not bring the Windows server fail over cluster (WSFC) resources online. (Error Code 5942). The WSFC service may not be running or may not be accessible in its currents states, or the WSFC resources may not be in a state that could accept the request.
For information about this error code see "system error code" in windows development documentation
The attempt to create network name and IP address for the listener is failed. The WSFC service may not be running or may not be accessible in its currents states or the value provide for the network name and IP address may be incorrect. Check the state of the WSFC cluster and validate network name and IP address with network administrator. (Microsoft SQL Server error 41066) ...
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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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Aug 5, 2015
I was looking to change the file growth setting in our AlwaysOn environment databases.We have a single availability group, one primary and one secondary replica. I learned that when changing the file growth setting on the primary databases (data file), the change flows though to the database on the secondary replica.However after doing the same with the log files, the file growth setting changed on the primary but the change did NOT propagate to the secondary.
Is the solution to apply the change directly to the secondary?here's the T-SQL code I used:
ALTER DATABASE myDB
MODIFY FILE ( NAME = N'myDB_log', FILEGROWTH = 512MB );
GO
SQL Server 2012 (11.0.5532)
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May 10, 2015
I want to truncate my sharepoint config database and WSS_Logging database logs the size of sharepoint_config database is growing at a pace of ~10GB every week. I have scheduled a weekly full backup. Current .ldf file size is 113GB.
I am using SQL server 2012 with Always On High Availability feature. I am not able to set the recovery mode from Full to Simple as it gives me message that mirroring is running on both server.
In my case to reduce the log file what I need to do.
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Apr 9, 2015
We have 2 data centers, site 1 and site 2. Site 1 is generally our primary, and site 2 is our Disaster Recovery (DR) site. I want to setup a SQL instance to have extremely high availability. Therefore I was looking at using DB mirroring, with synchronous data writing, high-safety and auto-failover. 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. 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. 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 8, 2015
can we join a node in a windows cluster which is already in a different cluster?
We have this requirement as we need to setup readable secondary ( always on AG) on the third node.
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Jul 15, 2015
We are planning to change all IPs of PRODUCTION Failover Cluster Setup. In my cluster setup ... we have 2 Physical Nodes with windows-2008, Roles are MSDTC and SQL-2008R2.
IP change for:
1. Both Nodes(Physical)
2. MSDTC
3. SQL Server
4. windows Cluster
So Almost... All IPs are going to change.
Im DBA here, I need to take care of SQL cluster and MSDTC. But I haven't performed this activity before.So I'm worrying about Impacts and consequences of this change. steps how should I perform this activity.
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Aug 21, 2000
I have setup a Microsoft SQL 7.0 cluster as Actice/Passive configuration on NT 4.0 Enterprise. The problem I am having is that when I create a shared folder on Node B on a shared drive then I reboot Nobe B, the cluster fails over to Node A, but the shared dispeares.
Does anyone have any idea why would this happend.
Thank You,
Piyush Patel
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Sep 16, 2015
Can we set up always on availability groups in server 2012 standard edition.
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Aug 6, 2015
We have a client which they have production 2 node cluster environment. On it around 200 databases with single SQL instance.
Now client wants disatster plan for these 200 database. In these 200 database 3 db's are around 80 GB each databases remaing are less than 5 DB.Note: All these 200 db's are having produciton sites (i mean to say each db is having single site)
For this DR paln clinet is going to provide other DR server,they wants to setup DR between exsting produciton cluster instance to this DR server.
So in this case we have suggest SQL server AlwaysOn availability group.
Here my main question is can we keep all these databases in single AG? .If yes, guidlines to move up. if not, do we have any limitations.Also, best method to setup for this DR plan.
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Oct 16, 2015
Merge replication on AlwayOn is configured, working fine on Original Publisher.When failover to possible publisher data is not being replicated.
Replication Monitor Error:
Message: Validation failed for the publisher 'RIMDNS' with error 21879 severity 16 message 'Unable to query the redirected server 'RIMDNS' for original publisher 'UNITEDKINGDOM' and publisher database 'TD_AO11' to determine the name of the remote server; Error
2, Error message 'Error 2, Level 16, State 1, Message: Named Pipes Provider: Could not open a connection to SQL Server [2]. '. '.
[Code] ....
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Oct 29, 2014
How many maximum database's can we have in AlwaysON Availability Group?
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Jul 22, 2015
I am looking for information on using CSV storage for a windows 2012r2 Hyper-V cluster configuration.
The cluster will be used by SQL Server 2014.
Mainly, does it support filestream.I have not found much documentation for using Cluster shared volumes with SQL Server 2014.There was a session at Tech-Ed 2014 on the subject.
SQL Server 2014 is the first version to support CSV storage.
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Dec 8, 2006
Is there a way for multiple SQL 2005 instances in a cluster to share drives for user databases.
Once we install our instances in the cluster using seperate disk resources. Can we then have multiple instances share the same physical disk for user databases only. This is for a test environment.
Thanks
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Sep 14, 2015
We have an AG scenario where we are using WFC on a 2 node cluster. We are then using AG for mirroring the databases to both nodes and have a listener.
What I want to do next is to establish another copy of the database at a remote location. But I don't want to add the 3rd system to the WFC. I am not a big fan of WFC and I have seen it causes many more problems. The 3rd system will be in a remote location and the network not 100% reliable. I have seen in the past that it causes the entire cluster to hang and causing my production to crash which I don't want.
I there a way to add a 3rd node to the mirror configuration. I don't know if I can add a 3rd node to the AG unless it is part of the same cluster.
I know I can configure log shipping, I am fine with it but in the source, I have no control of which node the DB will be. I am not sure if a log shipping scenario can be configured using the listener instead of the physical host.
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Aug 13, 2015
How do I add my second (secondary) node in my AlwaysOn Availability Group, after adding my head node, and the secondary node is a virtual machine. See based on the attached file if it is the correct way?
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Oct 16, 2015
We've just started using AlwaysOn High Availability and run into a wierd issue. I have 1 particular database that is not syncing data to the secondary replica. But when i look at all the dashboards, everything is green, they all say synchronised - but if I query the data they are not.
The database has additional sql transactional 1 way replication a different server which i was wondering if was causing any problems, but it's working ok.
I'm just wondering if there's any other more detailed logs i can check to see why the data is not flowing. The availability dashboard and it's event log all says ok.
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Sep 3, 2015
In the case of a manual failover, what happens to open transactions. Are they killed (rolled back), completed, a little bit of both?
Does the status of the query has any impact (are running queries handled differently then waiting ones, does the type of wait have an impact...)
I am using synchronous commit mode and all I seem to find is reference to the potential or absense of loss of data.
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Jul 3, 2015
How to test always on availablity after configuring them.I have configured always on group with 1 active and 1 passive with readonly.I want to test from application.what are cases which we can have for testing.
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Apr 28, 2015
I know that AlwaysOn creates a WSFC role in order to provide failover of the Availability Group Listener. But does it also "honor" the WSFC network setttings? What I'd like to do is isolate the client-side traffic from the database replication traffic. But it's not clear to me that AlwaysOn even uses that part of WSFC.
a) Can you totally isolate the traffic as I've described?
b) Does AlwaysON actually use WSFC network settings? If yes, then I guess I cannot do what I want, since my choices are Cluster & Client, or Cluster Only.
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Sep 18, 2015
We have a SQLServer 2012 Always-On Availability (AAG) Primary and Secondary Node installation/environments. On the Primary node, we have some databases that have the TRUSTWORTHY option enabled (Set to ON). But when the databases are synched/added to the AAG the databases loose the TRUSTWORTHY property and are reset to OFF on the Secondary Node.Because of this,When the instance fails over to the Secondary Node the applications that were working don’t work anymore.
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Oct 29, 2015
I have configured AlwaysOn HA setup with HyperV environments without shared disk and using quorum voting in file share witness.
1. I want to monitor AlwaysOn HA setup and AO Group database on daily basis.
2. To configure email alerts for proactive monitoring if unusual events occur.
Scripts for monitoring in that AO setup as well as AO group database ...
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