9840/9940/T10000/LTO - Resolving Drive Communication Errors

Asset ID:	1-71-1347725.1
Update Date:	2011-09-16
Keywords:

Solution Type Technical Instruction Sure

Solution 1347725.1 : 9840/9940/T10000/LTO - Resolving Drive Communication Errors

Applies to:

Sun StorageTek 9840 Tape Drive - Version: Not Applicable and later   [Release: N/A and later ]
Sun StorageTek 9940 Tape Drive - Version: Not Applicable and later    [Release: N/A and later]
Sun StorageTek T10000 Tape Drive - Version: Not Applicable and later    [Release: N/A and later]
LTO Tape Drive - Version: Not Applicable and later    [Release: N/A and later]
Information in this document applies to any platform.
Removed this KB from the CAP, # 927, as it does not meet CAP criteria.
This is still a valid knowledge entry.
Checked for relevance on 16-Sept-2011.

Goal

How to Resolve 9840/9940/T10000/LTO Drive Communication Errors.

Solution

PROBLEM OVERVIEW:

Unable to communicate with drive from server or drive not being seen from the switch. Excessive I/O errors being reported between drive and server.

CONFIRM THE FAULT BY CHECKING:
GBIC / SFP - Ensure that the GBICs are securely seated on the hosts and targets. Plugging and unplugging cables can cause the GBIC / SFP to become unseated. Ensure that the GBICs / SFPs are the same speed (1,2,4 gigabit) and type (optical nonOFC or copper).

CABLES - Ensure that all cables are attached. The "transmit port" of each device must be connected to the "receive port" of the next device. Normally (looking down the barrel of the connector) the "receive port" of a GBIC / SFP is on the left, and the "transmit port" is on the right (if a copper GBIC / SFP, longer edge of D-shell on top; if an optical GBIC / SFP, keyed side on the bottom) - There should be no sharp bends in the cable (you may break the optics cable).

All activity on the suspected drive should be discontinue from the server.

WHAT ACTION DOES THE ENGINEER NEED TO TAKE:

Should it be determined that the SFP module is defective, order part via standard channels.
Once SFP is acquired, replace the module using proper anti-static precautions.

CONFIRM THE FIX BY:

Verify drive in question is seen by the server/host. Run basic R/W tests from the server/host to verify functionality of drive and path to the drive.

PARTS NOTE:
Refer to the Sun Service Handbook, locate the PN of the SFP under the parts list for the Tape Product.

ADDITIONAL COMMENTS:

Doc 1016898.1: 9840C - Part Number for GBIC/SFP Transceiver

Doc 1016748.1: What is Part Number for SFP Connector on IBM FC LTO drive

Doc 1017282.1: T10000 - Part and Conversion Bill Numbers for 2 GB and 4 GB SFP Connector

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