7135 : non identical confiration on both nodes

ITEM: RS4000004883

QUESTION :                                                                      
Hi,                                                                             
is it possible to have a configuration where the 7135 is physically             
connected to 2 RS/6000, with two controllers, but on the first server           
each controller is connected to a different SCSI2 adapter, and on               
 the other one only the first controller is connected to an SCSI2               
 adapter ?                                                                      
If yes, how does it react in case of failure ?                                  
  --> failure of the first controller ( there are LUNs defined on both          
  controllers)                                                                  
  --> failure of a the first node                                               
No HACMP is considered in that configuration (hopefully)                        
                                                                                
Thank you                                                                       
                                                                               
ANSWER :                                                                        
Unfortunately, the configuration you proposed is not possible.  You             
cannot connect two hosts to a 7135 and connect one host to both                 
controllers(dacs) while the second host only has access to one dac.             
If you connect multiple hosts to a 7135, all the hosts MUST connect to          
all the dacs.  The only valid configuration with two hosts has both             
hosts with two scsi adapters and both hosts are connected to both               
dacs(controllers).                                                              
                                                                                
There have been several severe problems reported when customers tried           
to use the configuration proposed.  It is also not recommend to use             
the 7135 in a concurrent access, multi-host environment without                 
HACMP.                                                                          
                                                                                
Thank you for using AIX Technical Support.                                     



WWQA: ITEM: RS4000004883 ITEM: RS4000004883

Dated: 10/1996 Category: AIXSTORAGE

This HTML file was generated 99/06/24~12:43:04

Comments or suggestions?
Contact us