About HACMP & HANFS disk configuration.

ITEM: RTA000069469

My question is one of HACMP & HANFS disk configuration.                         
I had known that 2.4GB drive as SCSI-2 with 9334-500 is not supported.          
But I had thought that 2.4GB drive as SCSI-1 is supported with HACMP &          
HANFS. However, information in the HA forum says the following:                 
   "The 2.4GB drives are supported with SCSI-1 adapter                          
         (just not ever with HACMP)"                                            
                                                                                
   "SCSI-2 disks are not supported with HACMP(or HANFS)"                        
                                                                                
Is 2.4GB drive as SCSI-1 supported with HACMP & HANFS?                          
If not , please tell me a reason.                                               
                                                                                
                                                                                
                                                                                
ANSWER                                                                         
First, it must be understood that the 2.4GB disk drive is a SCSI-2 SE           
disk drive. Attaching it to a SCSI-1 adapter does not make it a SCSI-1          
drive. The definition of whether a drive is SCSI-1 or SCSI-2 comes from         
what SCSI commands it supports, not by what speed it can transfer at or         
what adapter it is connected to.                                                
                                                                                
As for support for the 2.4GB drive as a shared disk by HACMP or HANFS,          
the answer is that it is not supported by either product. This was              
announced as follows:                                                           
                                                                                
1. For HACMP:                                                                   
   The announcement letter for HACMP Version 1.2 states "HACMP/6000 does        
   not support SCSI-2 adapters or SCSI-2 disks as the shared disk sub-          
   system." (this includes the 2.4GB drive)                                     
2. For HANFS:                                                                  
   The announcement letter for AIX 3.2.4 states "The following are not          
   supported for an HANFS configuration:                                        
     - 9334-500 Expansion Unit with:                                            
        - ...various disks...                                                   
        - 2.4GB disk drive, feature #2590, #2593                                
        - All future IBM SCSI SE drives                                         
                                                                                
The reason is that the voltage and signal characteristics of SCSI-SE            
are not as reliable as SCSI-DE drives, which have now been announced. By        
withdrawing the SCSI Passthrough Cables and making these statements, IBM        
is trying to ensure that all future installations of these products will        
use SCSI-DE components for their shared SCSI disk requirements.                 
                                                                                
S e a r c h - k e y w o r d s:                                                  
HACMP HANFS SHARED DISK 2.4 GB SCSI-1 SCSI-2                                   



WWQA: ITEM: RTA000069469 ITEM: RTA000069469

Dated: 04/1995 Category: ITSAIHA6000

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