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App server failed after moving resource on MSCS

Former Member
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hi experts,

I setup separated 1 central instance and 3 dialog instances with two node DB/SCS clustered servers.

OS:windows2003

DB:MSSQL2005

SAP:NW04s ABAP

After moving cluster group(SAP,DB,other), all app servers turned to yellow in SAPMMC and showed the

message "Running but Message Server unreachable".

After few minitues goes, some of app servers turned green

and available, but others's disp + work failed and turned

gray, ofcourse it's unavailable.

it seems to be failure which happens while connecting to message server for some app servers.

If anybody has same experience or can give any advice to me, I'd like you to instruct me, please.

Thanks in advance.

Regards

MASAKI

Accepted Solutions (0)

Answers (1)

Answers (1)

Former Member
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Hi,

Did you configure your app servers to use the SAP cluster alias as SAPMSHOST ?

For Oracle, the app servers must also be in database reconnect mode. I guess there must be the equivalent foe MSSQL.

Regards,

Olivier

Former Member
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Thank you for reply.

SAPMSHOST of each instance is Virtual hostname of

DB instance.

Unfortunatly I am so new to MSSQL that I have no idea

regarding reconnect setting for that.

I've tested to find cause, some failure patterns have been

found. Judging from failure patterns, the number of app server

might cause this problem.

Because in case of less than app 3 servers this problem never occure.

But in case of more than app servers this problem occure with high rate.

Regards

MASAKI

Former Member
0 Kudos

Hi,

>SAPMSHOST of each instance is Virtual hostname of

>DB instance

You can't be right on this : SAPMSHOST has to be the virtual hostname of SAP CI instance.

It is SAPDBHOST that should be set to the virtual hostname of DB instance.

Regarding the number od app servers : check the number of allowed connections in your database.

Regards,

Olivier

Former Member
0 Kudos

Dear Olivier,

I Appricate your reply very much.

I really agree with your opinion.

SAPMSHOST must be set to be the virtual hostname of SAP(SCS).

It's set by default, so it's seems to be sap bugs or something.

Fortunatly our problem solved. The solution is adding all server's hostname to hosts file.

I found so many message " time out" in dev_disp.

Maybe DNS server works so badly due to someting that it must take long time to resolve hostname and IP address.

Anyway I relly feel thankfull for your support, Thanks!!

Regards

MASAKI