San Basics for Redhat Post: 302519681

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Operating Systems Linux Red Hat San Basics for Redhat Post 302519681 by mark54g on Wednesday 4th of May 2011 05:12:42 PM

05-04-2011

Registered User

Your question is very open ended and vague.

If you want to see if you have an HBA card in RHEL a few ways would be to do the following:

lspci -vv | egrep -i 'brocade|emulex|qlogic'

As well, you should probably look in:

/sys/class/scsi_host/host?/model_desc

Checking if it is faulty is a determination that is dependent on the fault.

Changing one depends on the interface. If it is a blade, then it will possibly be a mezzanine card and that may be the job of the support team of the manufacturer. Otherwise you must have a level of hardware knowledge to remove the blade and the associated card.

if it is a server, it will likely be some PCI standard (PCI-X or PCIe) device. It is replaced like any other.

Normally, the HBA is not reconfigured in case of replacement. That is usually handled at the SAN controller and switch, where the zone is now configured for the new WWID/WWN (World Wide ID or World Wide Name, similar to a MAC address). At that point, the rezone would occur and the representation of the LUN would be done to map to the new device. A rescan might be in order for the devices.

You can either look for a script that is available online called "rescan-scsi-bus.sh" and pass it the appropriate arguments to rescan, or you can do the following at the command line:

Code:

for i in /sys/class/scsi_host/host*
do
echo '- - -' > $i/scan
done

that should represent the LUNs to you.

You should use some sort of multipath driver, such as the one provided with most Linux installs (dm-multipath) or powerpath, securepath, etc.

Last edited by mark54g; 05-04-2011 at 06:34 PM.. Reason: fixed syntax error

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hba_getbindingsupport

HBA_GetBindingCapability(3HBAAPI)	      Common Fibre Channel HBA Information Library Functions		 HBA_GetBindingCapability(3HBAAPI)

NAME

       HBA_GetBindingCapability, HBA_GetBindingSupport, HBA_SetBindingSupport - return and sets binding capabilities on an HBA port

SYNOPSIS

       cc [ flag... ] file... -lHBAAPI [ library... ]
       #include <hbaapi.h>

       HBA_HANDLE HBA_GetBindingCapability(HBA_HANDLE handle,
	    HBA_WWN hbaPortWWN, HBA_BIND_CAPABILITY *pFlags);

       HBA_STATUS HBA_GetBindingSupport(HBA_HANDLE handle, HBA_WWN
	    hbaPortWWN, HBA_BIND_CAPABILITY *pFlags);

       void HBA_SetBindingSupport(HBA_HANDLE handle, HBA_WWN hbaPortWWN,
	    HBA_BIND_CAPABILITY Flags);

PARAMETERS

       handle	     an open handle returned from HBA_OpenAdapter(3HBAAPI)

       hbaPortWWN    the Port WWN of the local HBA through which the binding capabilities implemented by the HBA is returned

       pFlags	     a pointer to an HBA_BIND_CAPABILITY structure that returns the persistent binding capabilites implemented by the HBA

       Flags	     an HBA_BIND_CAPABILITY structure containing the persistent binding capabilites to enable for the HBA

DESCRIPTION

       The HBA_GetBindingCapability() function returns the binding capabilities implemented by the HBA.

       The HBA_GetBindingSupport() function returns the currently enabled binding capabilities for the HBA.

       The  HBA_SetBindingSupport()  function  sets  the currently enabled binding capabilites for the HBA to a subset of the binding capabilities
       implemented by the HBA.

RETURN VALUES

       The HBA_GetBindingCapability() and HBA_GetBindingSupport() functions return the following values:

       HBA_STATUS_OK

	   Persistent binding capabilites have been returned.

       HBA_STATUS_ERROR_ILLEGAL_WWN

	   Port WWN hbaPortWWN is not a WWN contained by the HBA referenced by handle.

       HBA_STATUS_ERROR_NOT_SUPPORTED

	   The HBA handle specified by handle does not support persistent binding.

       HBA_STATUS_ERROR

	   An error occurred. The value of pFlags remains unchanged and points to the persistent binding capabilites.

       The HBA_SetBindingSupport() function returns:

       HBA_STATUS_OK

	   Persistent binding capabilites have been enabled.

       HBA_STATUS_ERROR_ILLEGAL_WWN

	   Port WWN hbaPortWWN is not a WWN contained by the HBA referenced by handle.

       HBA_STATUS_ERROR_NOT_SUPPORTED

	   The HBA handle specified by handle does not support persistent binding.

       HBA_STATUS_ERROR_INCAPABLE

	   The flags argument contains a capability not implemented by the HBA.

       HBA_STATUS_ERROR

	   An error occurred.

ATTRIBUTES

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

       +-----------------------------+-------------------------------------+
       |      ATTRIBUTE TYPE	     |		ATTRIBUTE VALUE 	   |
       +-----------------------------+-------------------------------------+
       |Interface Stability	     |Standard: FC-MI 1.92 (API version 1) |
       +-----------------------------+-------------------------------------+
       |			     |Standard: FC-HBA Version 4 (API ver- |
       |			     |sion 2)				   |
       +-----------------------------+-------------------------------------+
       |MT-Level		     |Safe				   |
       +-----------------------------+-------------------------------------+

SEE ALSO

       libhbaapi(3LIB), attributes(5)

       T11 FC-MI Specification

SunOS 5.11							    1 Sep 2003					 HBA_GetBindingCapability(3HBAAPI)