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Full Discussion: Stupid Question?
Top Forums UNIX for Dummies Questions & Answers Stupid Question? Post 2178 by Neo on Wednesday 25th of April 2001 06:17:26 PM
Old 04-25-2001
Yes, SCSI can be 'pretty wierd' at times. In a nutshell, there are a total of 8 SCSI IDs on a SCSI bus (as I recall off the top of my head). These IDs are 0 - 7. Often the 0 ID is reserved for the 'host adapter' which is tyically the bus interfaced card. (someone please correct me if I've misstated the ID info).

The more tricky, and often fatal problem that come with SCSI, is the requirement to have electrical terminations at both ends of the bus. All devices between the two ends must not be terminated. This can cause real nightmares for people. Sometimes you get all the SCSI IDs just right, but in rearranging things on the bus, you forget to readjust your terminations and WHAM!

Sometimes it will boot just fine and run until a intense transfer on the bus causes the OS to panic (hang up and die). Sometimes even correctly configured devices and terminations can cause unexpected errors.

BTW: I used to be a very big fan of SCSI but (as you can read); I've moved to EIDE for most server applications. I have found EIDE to be 'fast enough' and more reliable. However, for fault tolerant applications (like CPU switchover and other complex RAID configurations) SCSI provides good bus flexibility. Depending on your application, carefully consider the complexity of SCSI vs. the simplicity of EIDE before making a purchase.

 

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LEARN ABOUT MINIX

tran_bus_reset

tran_bus_reset(9e)						Driver Entry Points						tran_bus_reset(9e)

NAME

       tran_bus_reset - reset a SCSI bus

SYNOPSIS

       #include <sys/scsi/scsi.h> int prefix

       tran_bus_reset(dev_info_t *hba_dip, int level);

INTERFACE LEVEL

       Solaris DDI

PARAMETERS

       hba_dip	       The  dev_info_t pointer associated with the SCSI HBA.

       level	       The level of reset required.

DESCRIPTION

       The   tran_bus_reset()  vector  in  the	scsi_hba_tran(9S) structure should be initialized during the HBA driver's attach(9E). It is an HBA
       entry point to be called when a user initiates a bus reset through device control interfaces.

       tran_bus_reset() must reset the SCSI bus without resetting targets.

       level will be one of the following:

       RESET_BUS       Reset the SCSI bus only, not the targets.

       Implementation is hardware specific. If it is not possible to reset the SCSI bus without changing the state and operating mode of the  tar-
       gets, the HBA driver should not initialize this vector or return failure.

RETURN VALUES

       tran_bus_reset() should return:

       1	on success.

       0	on failure.

ATTRIBUTES

       See attributes(5) for a description of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Stability Level 	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5), tran_quiesce(9E), scsi_hba_tran(9S)

SunOS 5.10							    17 Mar 1999 						tran_bus_reset(9e)
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