LTO6 - Drive Getting I/O Errors

Asset ID:	1-72-1620530.1
Update Date:	2017-09-26
Keywords:

Solution Type Problem Resolution Sure

Solution 1620530.1 : LTO6 - Drive Getting I/O Errors

Applies to:

IBM LTO6 Tape Drive - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

Tape drive IO Fails within TSM

12/13/13 06:35:46 ANR8311E An I/O error occurred while accessing drive
DRIVE32 (/dev/lin_tape/by-id/IBMtape500104F000A2D6B8) for
SETMODE operation, errno = 5, rc = 1. (SESSION: 17,
PROCESS: 2)
12/13/13 06:35:46 ANR8355E I/O error reading label for volume K00050 in
drive DRIVE32 (/dev/lin_tape/by-id/IBMtape500104F000A2D6-
B8). (SESSION: 17, PROCESS: 2)

The lin_tape Driver Error log :
IBMtape53----00491 Fri Dec 13 06:35:47 2013
Scsi Path : 04 00 18 00
CDB Command : 1A 00 10 00 FF 00
Status Code : 00 0D 00 00
Description : Unknown Host Error
---------------------------------------------------------------------
IBMtape53----00491 Fri Dec 13 06:38:24 2013
Scsi Path : 04 00 18 00
CDB Command : 5F 00 00 00 00 00 00 00 18 00
Status Code : 00 0D 00 00
Description : Unknown Host Error

Messages
Dec 13 06:35:46 datsrv53 kernel: [51368.323254] lin_tape: IBMtape53----00491 tape_modesense_page failed: -5
Dec 13 06:38:24 datsrv53 kernel: [51525.995263] lin_tape: IBMtape53 tape_register_reservation_key failed, rc -5
Dec 13 06:38:24 datsrv53 kernel: [51525.995270] lin_tape: IBMtape53 failed release on close.

Cause

IBM LTO6s are Encryption capable and they will have Belisarius (Bel) Modules installed.
The purpose of this module in IBM LTOs is to multiplex the TTI & KMS signals to the IBM LTO 4, 5 & 6 drives and even though the Bel card is not actually multiplexing in our particular case, the code in this card has been changed to increase the time out value to prevent bar code write failures, the reason for intermittent I/O errors.

Solution

The recommendation is to install Bel code at 4.17.12.35,this is the latest.
It will be necessary to check out the timeout value when this code is loaded, it needs to be set to at least 60 Secs

References

<NOTE:1546547.1> - IBM LTO - Process to Upgrade Belisarius Microcode On IBM LTO Drive
<NOTE:1496557.1> - OKM/KMS / IBM LTO - How To Set IBM LTO4/5 Drive Encryption Timeout Value on Belisarius Card, EMC RKM Solution

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