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SCSI bus problems

Hi,
We have an installation which has 2 AS2100 4/275, working with DECsafe 
1.2 and DU 3.2C (Rev 148).
Some days ago, in a random way, we are reading some weird messages 
regarding the local bus, involving the O.S. disk. After this message 
appears, we perceive a slow performance, which sometimes led us to 
reboot the computers.
The message is as follows :
BTW, some weeks ago the system disk was changed due to a hard error.

********************************* ENTRY    17. 
*********************************

----- EVENT INFORMATION -----

EVENT CLASS                             ERROR EVENT
OS EVENT TYPE                  199.     CAM SCSI
SEQUENCE NUMBER                  7.
OPERATING SYSTEM                        DEC OSF/1
OCCURRED/LOGGED ON                      Thu Nov 28 08:35:08 1996
OCCURRED ON SYSTEM                      sapbd2
SYSTEM ID                 x00060009     CPU TYPE:  DEC 2100
SYSTYPE                   x00000000
PROCESSOR COUNT                  2.
PROCESSOR WHO LOGGED      x00000000

----- UNIT INFORMATION -----

CLASS                         x0000     DISK
SUBSYSTEM                     x0000     DISK
BUS #                         x0000
                              x0000     LUN x0
                                        TARGET x0

----- CAM STRING -----

ROUTINE NAME                            tmv2_continue_cbf

----- CAM STRING -----

                                        corrupt host ping buffer 
received

----- CAM STRING -----

ERROR TYPE                              Soft Error Detected 
(recovered)

----- CAM STRING -----

DEVICE NAME                             DEC     RZ28

********************************* ENTRY    18. 
*********************************

I'll summarize
TIA
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