We had a somewhat similar problem almost a year ago, which was caused by 
Windows 2008 TSM clients older than the 6.2 release:
IC66810: 6.1.2 AND 6.1.3 TSM WINDOWS CLIENTS WITH DEFAULT SYSTEM STATE WRITERS 
ON WIN 7 AND 2008 R2 MAY GET FULL SYSTEM STATE BACKUPS
The problem went away when the clients were upgraded to 6.2.1.0 (now I'd use 
6.2.2.0).
- Margaret Clark

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Hans Christian Riksheim
Sent: Wednesday, April 13, 2011 1:18 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Expiration causes backups to hang

Hi,

anyone else have this problem? Running 6.2.2 on AIX 6.1. Submitting a PMR on
this in parallell.

When I say hang I mean a complete hang. All incoming backups stops. Traffic
is resumed when we cancel expiration.

Hans Chr.