No collocation and backup directly to tape.
Not any other message which could be related to the problem.
Especially no device or tape problems.
It is the lack of information which make me ask .... 

> -----Message d'origine-----
> De : ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] De 
> la part de Larry Clark
> Envoyé : mardi 2 octobre 2007 14:11
> À : ADSM-L AT VM.MARIST DOT EDU
> Objet : Re: [ADSM-L] Msgno=ANR0523W
> 
> There's isn't enough information.......
> Since it is the same client over several days I would ask if 
> you have collocation set and if you are backing up to tape. 
> If so, it might suggest a bad volume.
> Look in the activity log and see if there is a reference.
> ----- Original Message -----
> From: "CAYE PIERRE" <Pierre.Caye AT ALCATEL-LUCENT DOT FR>
> To: <ADSM-L AT VM.MARIST DOT EDU>
> Sent: Tuesday, October 02, 2007 7:58 AM
> Subject: [ADSM-L] Msgno=ANR0523W
> 
> 
> I got the following message during backup of one and only one 
> node, always the same, since few days :
> 
> ANR0523W Transaction failed for session 127 for node BCV51S80_SAP (TDP
> R3 HP) - error on output storage device.
> 
> The meaning is that TSM stop a db transaction because of 
> device problem BUT there are no device problem of any kind 
> and my backups felt down in error.
> On TSM server (AIX 5.3 and TSM 5.3.4.2), there are no 
> filesystems corruptions.
> 
> I suspect a possible db corruption but there are no other 
> symptoms than this one.
> 
> Some help ?
> 
> Pierre
>