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Full Discussion: PowerHA(HACMP) full vg loss - cluster hangs on release_vg_fs event
Operating Systems AIX PowerHA(HACMP) full vg loss - cluster hangs on release_vg_fs event Post 302792615 by MichaelFelt on Wednesday 10th of April 2013 04:57:49 PM
Old 04-10-2013
Well, you need to differentiate between between full SAN loss (no nodes can see disks) and failure of only one node seeing disk.

It has been years since I have debugged HACMP scripts - there have been a lot of additions to what is checked, but at it's core the problem is that a resource has gone done - not a topology element - so it is up to the application stop script to make sure the resources are released before "standard processing" continues.

To have this fully automated you would need to write a recovery script that HACMP could call - as config_too_long - means HACMP does not see this as an error.

What I would look for is using the application monitoring abilities to see that the application is down and doing a verification of the resources on the "active" node.

If I recall correctly, the steps PowerHa takes is:
1) application stop - key here is that there are no open files on file system so that following step(s) that
2) release the resources (i.e. 2a) unmount filesystems and 2b) varyoffvg volume group) can succeed.

Again, config_too_long means the script is not exiting with any status - so it is not an error. It is hanging. I would have to look at both the current script as well as application monitoring to determine if application monitoring could inject a new action by the cluster manager to forcibly unmount the filesystems. I am guessing that is not a possibility.

Comment: I would be nervous to be mixing vSCSI and NPIV within a resource group. No real issues with a mix in the cluster, but real concerns when mixing technologies for a single resource in a resource group.

Hope this helps you advance your testing! Good diligence!
 

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LEARN ABOUT OPENSOLARIS

scds_get_rg_hostnames

scds_get_rg_hostnames(3HA)				 Sun Cluster HA and Data Services				scds_get_rg_hostnames(3HA)

NAME

       scds_get_rg_hostnames - get the network resources used in a resource group

SYNOPSIS

       cc [flags...] -I /usr/cluster/include file
	 -L /usr/cluster/lib  -l  dsdev
       #include <rgm/libdsdev.h>

       scha_err_t scds_get_rg_hostnames(char *resourcegroup_name,
       scds_net_resource_list_t **netresource_list

DESCRIPTION

       The  scds_get_rg_hostnames()  function  retrieves  a list of hostnames used by all the network resources in a resource group. This function
       returns a pointer to the list in netresource_list.  It is possible for a resource group to contain  no  network	resources  or  to  contain
       resources that do not use network resources, so this function can return netresource_list set to NULL.

       You  can pass the name of any resource group name in the system to scds_get_rg_hostnames(). Use the hostnames returned by scds_get_rg_host-
       names() to contact applications running in the specified resource group.

       Free the memory allocated and returned by this function with scds_free_net_list().

PARAMETERS

       The following parameters are supported

       resourcegroup_name	   Name of the resource group for which data is to be retrieved

       netresource_list 	   List of network resources used by the resource group

RETURN VALUES

       The scds_get_rg_hostnames() function returns the following:

       0			   The function succeeded.

       non-zero 		   The function failed.

ERRORS

       SCHA_ERR_NOERR		   Function succeeded.

       See  scha_calls(3HA) for a description of other error codes.

FILES

       /usr/cluster/include/rgm/libdsdev.h

	   Include file

       /usr/cluster/lib/libdsdev.so

	   Library

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscdev 		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       scds_free_net_list(3HA), scds_get_rs_hostnames(3HA), scha_calls(3HA), attributes(5)

Sun Cluster 3.2 						    14 Sep 2007 					scds_get_rg_hostnames(3HA)
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