Question about HACMP for active-active mode Post: 302365516

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Operating Systems AIX Question about HACMP for active-active mode Post 302365516 by shockneck on Tuesday 27th of October 2009 09:38:38 AM

10-27-2009

Registered User

HACMP terminology changed now and then. Some terms were used with older HACMP versions 3 and 4, some came into existence with the current HACMP Version 5 while others ceased to exist. The same is true with certain functions/possibilities. IBM Speak itself can be a bit challenging but when you mix up words from different times you end up in a mess.

An active-active cluster has (at least) two nodes and two Resource Groups RG. So there is one RG per node and only during takeover/failover two RG are on one node. This is a very good setup because during normal operation the RG (its application) has its dedicated CPU/RAM/IO. Furthermore not everybody can afford running (i.e. paying for) two servers but using only one. It does not at all mean that there is no takeover / failover possible.

A concurrent HACMP RG means Oracle RAC. I am not aware of another application that is able to run as a concurrent HACMP cluster. While there are two or more nodes active at a time this is not usually called an active-active configuration as no takeover is involved. In a concurrent cluster a node may die but the other(s) keep on working regardless.

Cascading / rotating is related to RG behaviour. If there is a fixed order of how the RG is taken over from node to node (usually in a Cluster with 3+ nodes that are different so that using certain nodes is perferable) this is a cascading behaviour. If the RG does not care on what node it is active, i.e. it can be active on any node a rotation of the RG might be OK.

Concurrent volume group are rarely used these days. Today you are likely to use Enhanced Concurrent Mode VG. And Oracle RAC can use an ECM VG in a Concurrent Cluster.

As you might have guessed by now already: some reading might be required. If you are an absolute beginner with HACMP you might start by reading the HACMP cookbook from December 2005 followed by the PowerHA cookbook (yes, the name changed with 5.5 ....) from September 09.

shockneck

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LEARN ABOUT REDHAT

pvmfsetrbuf

SETRBUF(3PVM)							  PVM Version 3.4						     SETRBUF(3PVM)

NAME

       pvm_setrbuf - Switches the active receive buffer and saves the previous buffer.

SYNOPSIS

       C    int oldbuf = pvm_setrbuf( int bufid )

       Fortran	 call pvmfsetrbuf( bufid, oldbuf )

PARAMETERS

       bufid   Integer specifying the message buffer identifier for the new active receive buffer.

       oldbuf  Integer returning the message buffer identifier for the previous active receive buffer.

DESCRIPTION

       The  routine  pvm_setrbuf switches the active receive buffer to bufid and saves the previous active receive buffer oldbuf.  If bufid is set
       to 0 then the present active receive buffer is saved and no active receive buffer exists.

       A successful receive automatically creates a new active receive buffer.	If a previous receive has not been unpacked and needs to be  saved
       for later, then the previous bufid can be saved and reset later to the active buffer for unpacking.

       The  routine  is  required  when  managing multiple message buffers.  For example switching back and forth between two buffers.	One buffer
       could be used to send information to a graphical interface while a second buffer could be used send data to other tasks in the application.

EXAMPLES

       C:
	    rbuf1 = pvm_setrbuf( rbuf2 );

       Fortran:
	    CALL PVMFSETRBUF( NEWBUF, OLDBUF )

ERRORS

       These error conditions can be returned by pvm_setrbuf

       PvmBadParam
	      giving an invalid bufid.

       PvmNoSuchBuf
	      switching to a non-existent message buffer.

SEE ALSO

       pvm_setsbuf(3PVM)

								  30 August, 1993						     SETRBUF(3PVM)