AdvFS fileset soft limit automatically set

Hi Gurus,

Hopefully someone can re-assure me this is not a bug and merely a *product 
feature*...

Running Tru64 v4.0F PK8 and I have an AdvFS file domain with an LSM volume 
as its disk. I have created AdvFS filesets from this file domain which 
appears as:

# df -k
Filesystem       1024-blocks        Used   Available Capacity  Mounted on
...
db3_domain#db3       4089520     3595696      493824    88%    /db3
db3_domain#local     8880632      116487     5160384     3%    /usr/local
...
#

Notice the 1024-blocks for db3_domain#db3? This was previously 8880632 but 
after restoring a large amount of data from tape somehow the total size then 
drops to 4089520. I later found that the cause was an AdvFS fileset soft 
limit which was somehow automagically sets while copying large files.

Resetting the softlimit to 'unlimited' as follows solved the problem:
# chfsets -B 0 -b 0 db3_domain db3
db3
        Id           : 371e163d.000615f5.3.8003
        Block H Limit: 0 --> 0
        Block S Limit: 4089520 --> 0
# df -k
Filesystem       1024-blocks        Used   Available Capacity  Mounted on
...
db3_domain#db3       8880632     3595696     5160384    42%    /db3
db3_domain#local     8880632      116487     5160384     3%    /usr/local
...

My query is simply whether this behaviour is an built-in feature to AdvFS? 
Perhaps to prevent some malicious user from totally filling up the domain?

Thanks in advance.

Regards,
Bobby Mackun

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