Sun Storage S1 Array: How to Manage SCSI Transfer Speed

Asset ID:	1-71-1005020.1
Update Date:	2014-12-18
Keywords:

Solution Type Technical Instruction Sure

Solution 1005020.1 : Sun Storage S1 Array: How to Manage SCSI Transfer Speed

Applies to:

Sun Storage S1 Array - Version All Versions and later
Sun Fire V440 Server - Version Not Applicable and later
All Platforms

Goal

A poor SCSI negotiation speed occurs when a Sun Storage S1 Array is attached to a Sun Fire V440 Server's onboard SCSI external port. You can check the negotiation speed with the following:

# prtpicl -v | grep sync
:no-dma-interrupt-sync
:target0-sync-speed        320000
:target1-sync-speed        320000
:target2-sync-speed        320000
:target0-sync-speed        40000
:target1-sync-speed        40000
:target2-sync-speed        40000

In the example, the last 3 disks are running at 40000, but the onboard SCSI controller in the Sun Fire V440 Server is an Ultra320 SCSI device, and the Sun Storage S1 Array is an Ultra160 SCSI device. Therefore, the speed should be set to 16000.

Also, the following messages appear during boot:

NOTICE: mpt1: fault detected in device; service still available
NOTICE: mpt1: Connected command timeout for Target 0
WARNING: /pci@1f,700000/scsi@2,1 (mpt1):
Target 0 reducing sync. transfer rate

Solution

Add the following to the /kernel/drv/mpt.conf file and then reboot. The correct syntax for "parent" and "unit-address" is taken from the error message at boot time, for example:

name="mpt" parent="/pci@1f,700000"
unit-address="2,1"
scsi-options=0x1ff8;

Compare the prtpicl output following this change to the output shown previously:

# prtpicl -v | grep sync
:no-dma-interrupt-sync
:target0-sync-speed        320000
:target1-sync-speed        320000
:target2-sync-speed        320000
:target0-sync-speed        160000
:target1-sync-speed        160000
:target2-sync-speed        160000

Do you still have questions? You can use My Oracle Support Communities. Communities put you in touch with industry professionals like yourself. They are monitored by Oracle support engineers, so you can expect reliable and correct answers. Ask questions and see what others are asking about in the Disk Storage 2000, 3000, 6000 RAID Arrays & JBODs Community.

Previously Published As
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