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Sun Enterprise 5500 Server
 

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Applies to:

Goal

Decoding device paths to board slot locations.

The document provides instructions, tables, and examples to assist a user in identifying which board slot number is referenced from a Sun Enterprise[TM] (also known as "Ultra Enterprise") 3000, 3500, 4000, 4500, 5000, 5500, 6000, and 6500 Server device path.

Solution

Decoding device paths to identify a board slot number.

Example using a device path from an Ultra Enterprise[TM] 3000 Server:

/sbus@3,0/SUNW,fas@3,0/sd@0,0

The first portion ("sbus@3,0")of the device path indicates the I/O board slot location.  In Table 1 below, sbus@3,0 correlates to the I/O board in slot 1 which is located on the rear of the machine (UE 3000's only use the rear, odd number slots because there are internal disks in the front).

I/O Board Sbus@Front/Rear Slot Assignments

Table 1(a): Front Slot Assignments:

Table 1(b): Rear Slot Assignments

The second portion ("SUNW,fas@3,0") of the device path indicates the type of onboard controller and the Sys I/O bus it uses (see Table 2 below).  I/O boards are basically split in half, each half is controlled by a Psycho or Sys I/O chip (A or B).  SUNW,fas@3,0 correlates to the onboard (built-in) fast/wide SCSI controller at Sys I/O B on this board.

Onboard Controller Assignments

Table 2: Onboard Controller Assignments

The next portion of the device path ("sd@0,0") correlates to the SCSI disk (sd) set to target id 0 (in this case an internal disk, since only internal disks should be controlled by the onboard SCSI controller of the I/O board in slot 1).

Example 1:

/sbus@6,0/SUNW,socal@d,0/sf@0,0/ssd@2200002136bcd49,0 (ssd27)

***NOTE: sf@0 is the GBIC port on the right and sf@1 is the GBIC port on the left when looking at an I/O with soc+ (socal) board.; On an Enterprise 3000 & 3500, sf@0 is the GBIC port on the bottom and sf@1 is the GBIC port on the top.

Example 2:

/sbus@5,0/scsi@2,0/st@5,0

Example 3:

Without access to the tables above, one is forced to use a different method to determine slot location.

/sbus@2,0/SUNW,socal@d,10000/sf@0,0/ssd@w21000020370df2a8,0

Divide the "sbus@#" by 2, the remainder is not important.

sbus@2 = Divide the 2 by 2 to reveal the I/O board slot number "2/2 = 1"
I/O board slot number = 1

NOTE:  Always divide the "sbus@#" by 2, the remainder is not important (i.e /sbus@7, 7/2 = 3 r1).

The device drivers used in this example are some of many device drivers that could appear in the device driver section. See examples below:

Note:

From the Ultra™ Enterprise™ 3000 System Installation Guide (802-6050), section 2.7, and the Sun Enterprise 6500/5500/4500 Systems Installation Guide (805-2631) section 2.8:

“External SCSI-2 devices connect to your system through the built-in single-ended Fast/Wide SCSI-2 port on I/O boards (except for the board in slot 1), or through FSBE/S, DSBE/S, SWIS/S, or DWIS/S SBus cards installed on I/O boards.

Note – The onboard SCSI-2 bus on the I/O board in slot 1 controls internal SCSI tray devices. Therefore, the external SCSI connector on the I/O board in slot 1 must always have a terminator installed.”

The HD68, Single Ended, Fast Wide terminator, part number 150-2267, should be used to terminate the SCSI port on I/O board #1.

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