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I have 6 Aos's. 5 are part of one cluster and other one which is a batch server is in separate cluster. For the past few months, we been noticing that 2 or 3 random Aos's out of 6 are going to dead state in online users form (Including batch AOS server), though the services are in started state. The users who are already on the dead AOS's are still able to perform their tasks for some time. But eventually the services will stop and kick everyone out. This is happening more often recently. Did not find any information in application and system event logs for any of the AOS servers or database servers.
Kernel version: 18.104.22.168.5628
Application version: 6.0.947.280
Has anyone else faced the similar problem? Please help
Can you find any related events in the Windows event viewer on the servers?
Do you know something about memory consumption on those servers? Did you.monitor the used hardware resources already?
Thanks for the reply.
I have monitored the resources on all the servers and they are looking good. All of them have 16GB memory and 2 core processors. Memory consumption as of now is about 30% on all the servers.
No related events were found in the windows application or system log except below 2 which have been living with for a while.
Object Server 01: The database reported (session 1 (-AOS-)): [Microsoft][SQL Server Native Client 10.0][SQL Server]Warning: Null value is eliminated by an
aggregate or other SET operation.. The SQL statement was: "UPDATE SYSCACHEFLUSH SET CLEARDATA=?,RECVERSION=?,MODIFIEDDATETIME=? WHERE ((RECID=?) AND (RECVERSION=?))"
Object Server 01: Dialog issued for client-less session 1: Cannot edit a record in System cache flush (SysCacheFlush).
The SQL database has issued an error.
I have 2 other AOS's going down. This time the services are stopped completely. They still appear as dead in online users form.
Windows application Event log reads the following
Object Server 01: Unexpected situation
More Information: Session Allocation Failed: Session is already allocated.
Please verify why you have Kernel version and Application version difference
it is recommended to keep both the version simmilar
Please update us with your findings
Microsoft provides kernel updates separately. This is causing the difference in Kernel and Application version. This is normal and it is in this case not possible to have the versions similar.
@SomuAx2012: Make sure the client executable version and AOS binaries do have the same version number. Do all AOS and clients have been updated with the same kernel version?
As I mentioned earlier. This is very random. Happening on any of the 6 servers.
All the AOS's have the same kernel and application versions.
We use citrix for users to access the application. I see the same versions even if I login using citrix. Can you please let me know if I am missing anything here..
Can you try installing the latest kernel hotfix from the below link,
Also did you come across Denis blog sinedax.blogspot.in/.../ax-2012-aos-crash-kernel-hotfix_5.html
I have seen this quite a few times -- unfortunately, with a couple of answers. Multiple clients on the Citrix server are trying to use the same session on the AOS. The throws a user session error which will stop the AOS from allocating new sessions, and eventually lead to everyone being kicked out. You need to find out which of the Citrix client configurations are leading to this -- without seeing your environment or architecture, I can't say where the bad citrix configurations are coming from. However, I can get you started:
1. Is your Citrix client properly configured for load balancing also? 2. How many different configurations are you using for your citrix client -- the wrong configurations will led to attempts to start sessions on other environments. 3. Use Windbg.. this is about as textbook of a case as you can get for sitting there and watching the call stack (and client sessions) right before the AOS generates the errors, even a dump would answer the mystery for you. Then, determine which configurations are responsible. Hope that helps.
Load balancing using AOS cluster configuration.
All reporting load will be one AOS only then.which AOS is having the extension installed?
.Is any AOS marked as load balancer?
IF not see the client configuration. the first AOS and second aos in the client config might be frequently out.
Is there any NLB ?
As of this , In my machine, i have 3 AOS running working good. I think this is a common problem for anyone who are using AX2012xx.
I too face same problem while running second AOS in my machine.
My Suggestion is,
1.Make sure why your kernal version and application versions are different.
2.Check the Hardware compatibility i.e by Increasing RAM size (more than 8GB)..
3.Make the use of Rollup CU6 and CU7 hotfixes..
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