On Dec 27, 2006, at 1:58 PM, Bill Verity wrote:

>> On 12/27/2006 11:06, Nathan Brindle wrote:
>>> I've never been a fan of no-archive lists, so it's a blind spot  
>>> for me.
>
> Our default is to keep archives for two months.  For class related  
> lists, we keep them for four months which covers a semester.  We  
> like to have logs to help diagnose problems. We've started adding a  
> Notebook-Header= Full to provide additional information to track  
> problems.
>
> We run a job every Saturday evening that purges old archive files.   
> We keep a separate file, read by the Saturday job, that has a list  
> of retention periods.  Some lists we just keep a week.  Others are  
> kept forever.  A few have explicitly asked for no archives at all.
> -- 
> When a clock is hungry it goes back four seconds.

We keep logs until we need disk space. So far, on our current Linux  
box, I have never run low on disk space in the three years its been  
deployed. Instructors are free to clear out their class-related  
lists' logs if they want.