what does status ACTIVE mean?

[Zeus V Panchenko]

Hi,

i used to see in daily report gmirror status output and it looked
like:

      Name    Status  Components
mirror/gm0  COMPLETE  gpt/storage1
                      gpt/storage2

but recently i began to see:
      Name    Status  Components
mirror/gm0  COMPLETE  gpt/storage1 (ACTIVE)
                      gpt/storage2 (ACTIVE)

while trying to find the explanation, i have got confused ...
may somebody agree to clarify it for me, please, what `ACTIVE' namely mean?
may it be caused by resent cvsup to stable?

> uname -a
FreeBSD 8.2-STABLE #1: amd64

-- 
Zeus V. Panchenko
JID:zeus at gnu.org.ua			      	        GMT+2 (EET)