[Info-vax] Request description of UFS for VMS person

[Richard B. Gilbert]

ChrisQ wrote:
> Bill Gunshannon wrote:
> 
>> Are you saying that the blocks used by a file that has been deleted are
>> not going to be reused?  Assuming a decent file allocation scheme I would
>> expect the freed blocks to be in locations that were likely to be 
>> considered
>> prime real estate for the next file that needed space.
>>
>> bill
>>
> 
> I guess you could define an algorithm that ensured that the most 
> recently deallocated blocks went to the back of a queue which defined 
> which blocks were next allocated. A sort of disk block usage fifo 
> scheme. On modern systems with sparsely used drives, it could provide a 
> larger window for undelete operations.
> 
> Asuming that you keep backups though, undelete becomes more work than 
> it's worth in system complexity terms...
> 
> Regards,
> 
> Chris
> 

I can "undelete" a file in seconds.  Restoring it from backup could take 
  an hour or more.  I still say it's better to think BEFORE you delete. 
  Much less trouble that way!