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Full Discussion: San disk appearing double in old AIX
Operating Systems AIX San disk appearing double in old AIX Post 302912283 by bakunin on Thursday 7th of August 2014 03:41:33 AM
Old 08-07-2014
Quote:
Originally Posted by Tharsan
Actually i want to do the behaviour of the modern driver with the old one.
You can't. You will have to install some sort of MPIO driver (which one that is depends on the SAN you use) and this driver will bundle several hdisk-devices (they represent the OSes view of the disk) to one multipath-device (vpath, powerpath, ..., these represent the multipath drivers view of the device)

Quote:
Originally Posted by Tharsan
If i allocated only one WWN for a LUN, then i have no secondary route in case of failure ?
See above, my rather exhaustive explanation of how a SAN works (#3): no! A WWN is like an address, not a way to get there. Regardless of the route you take it always ends at the same LUN. The WWN is an attribute of the LUN, not the path (otherwise all LUNS sharing the same path would have the same WWNs, no?)

I hope this helps.

bakunin
 

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LEARN ABOUT OPENSOLARIS

stmfdevidfromwwn

stmfDevidFromWwn(3STMF) 			   SCSI Target Mode Framework Library Functions 			   stmfDevidFromWwn(3STMF)

NAME

       stmfDevidFromWwn - convert a WWN to a stmfDevid structure

SYNOPSIS

       cc [ flag... ] file... -lstmf [ library... ]
       #include <libstmf.h>

       int stmfDevidFromWWN(uchar_t wwn[8], stmfDevid *devid);

PARAMETERS

       wwn	The 8-byte WWN identifier.

       devid	A  pointer  to a stmfDevid structure allocated by the caller. On successful return, this will contain the converted device identi-
		fier. On error, the value of this parameter is undefined.

DESCRIPTION

       The stmfDevidFromWwn function convert a WWN to a stmfDevid structure. It returns the devid as a SCSI name string.

RETURN VALUES

       The following values are returned:

       STMF_ERROR_INVALID_ARGUMENT

	   The value of wwn was not valid WWN identifier.

       STMF_STATUS_SUCCESS

	   The API call was successful.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       libstmf(3LIB), attributes(5)

SunOS 5.11							    9 Jun 2008						   stmfDevidFromWwn(3STMF)
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