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Operating Systems AIX Question about HACMP for active-active mode Post 302366680 by qiulang on Friday 30th of October 2009 05:44:19 AM
Old 10-30-2009
Thanks for the answer.

Actually what I did not understand before was what was the value of running 2 instances of the same application on one node during the failover? If the resource group contains the same application on both nodes, why not just make takeover not happen here ? Because from the client point of view, the service still exists while running two same instances on one node may make the node overloaded.

As zxmaus pointed out that two same instances can server different purposes(say, database 1 is used for trading, database 2 for reporting). I think that makes sense. But if two instances serve the same purpose I still don't see the value in it.

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rpc_gss_get_principal_name(3N)											    rpc_gss_get_principal_name(3N)

rpc_gss_get_principal_name() - get principal names at server SYNOPSIS
Servers need to be able to operate on a client's principal name. Such a name is stored by the server as a structure, an opaque byte string which can be used either directly in access control lists or as database indices which can be used to look up a UNIX credential. A server may, for example, need to compare a principal name it has received with the principal name of a known entity, and to do that, it must be able to generate structures from known entities. takes as input a security mechanism, a pointer to a structure, and several parameters which uniquely identify an entity on a network: a user or service name, a node name, and a domain name. From these parameters it constructs a unique, mechanism-dependent principal name of the structure type. Notes Principal names may be freed up by a call to See the free(3C) manpage. A principal name need only be freed in instances where the name was constructed by the application. Values returned by other routines need not be freed because they point to structures that already exist in a context. PARAMETERS
How many of the identifying paramaters (name, node, and domain) to specify depends on the mechanism being used. Kerberos V5, for example, requires only the user name parameter but can accept the node and domain too. An application can choose to set unneeded parameters to NULL. For additional information on data types for parameters, see the rpcsec_gss(3N) manpage. principal An opaque, mechanism-dependent structure representing the client's principal name. mech An ASCII string representing the security mechanism in use. Valid strings may be found in the file, or by using name A UNIX login name (for example, 'gwashington') or service name, such as 'nfs'. node A node in a domain; typically, this would be a machine name (for example, 'valleyforge'). domain A security domain, for example, a DNS or NIS domain name (for example, 'eng.company.com'). MULTITHREAD USAGE
Thread Safe: Yes Cancel Safe: Yes Fork Safe: No Async-cancel Safe: No Async-signal Safe: No These functions can be called safely in a multithreaded environment. They may be cancellation points in that they call functions that are cancel points. In a multithreaded environment, these functions are not safe to be called by a child process after and before These functions should not be called by a multithreaded application that supports asynchronous cancellation or asynchronous signals. RETURN VALUES
returns if it is successful; otherwise, use to get the error associated with the failure. FILES
File containing valid security mechanisms. SEE ALSO
free(3C), rpc(3N), rpc_gss_set_svc_name(3N), rpc_gss_get_mechanisms(3N), rpcsec_gss(3N), mech(4). rpc_gss_get_principal_name(3N)

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