From: Henrry Aranda [mailto:harango AT HOTMAIL DOT COM] 
> TSM Server 5.1.5.2 on AIX 5.1, a FC Adapter 6228 and an IBM 
> LTO 3583 with SANDataGateway. When the library is performing 
> an intensive write process, I get the following messages in 
> the activity log:
> 
> 01/07/03 17:02:48 ANR8311E An I/O error occurred while 
> accessing drive 3583DRV2 (/dev/rmt2) for WRITE operation, 
> errno = 5. 
> 01/07/03 17:02:48 ANR1411W Access mode for volume 
> 393ACA now set to "read-only" due to write error. 
> 01/07/03 17:02:48 ANR8302E I/O error on drive 3583DRV2 (/dev/rmt2) 
> (OP=OFFL, Error Number=5, CC=0, KEY=0B, ASC=4E, ASCQ=00, 
> SENSE=70.00.0B.00.00.00.00.1C.00.00.00.00.4E.00.00.00.10-.47.0
> 0.00.00.01.20.20.20.20.20.20.20.1A.00.01.40.DF.01.0-0,
> Description=An undetermined error has occurred). Refer to 
> Appendix D in the 'Messages' manual for recommended action.

According to the TSM messages manual (RTFM, sir), ASC=4E and ASCQ=00
indicates 'overlapped commands attempt', which sounds to me like
something is getting overrun.

> IBM changed this drive twice, but I still get the same 
> messages. Does somebody know if it is a known problem with 
> the OS or the TSM version?

I'm not sure why IBM would replace the drive. Is it always the same one?
(We'll all assume you've done the simpler things like replace the fiber
cables/adapter.)

I'd kick this to Tivoli Support and let them wrassle with it.

--
Mark Stapleton (stapleton AT berbee DOT com)