Plz, could you help me to get these points more clear?

1. I need to know how takeover can occur automatically in HADR, instead of manually running command ... db2 takeover hard on db by force
(Where the second node automatically be primary just when failure occur in the first node)

Hint: in my environment I have no SAN or even shared resource

2. According to my information, HADR applied only on each database alone.
(So if I have 30 databases in the instance I should configure HADR on each database alone)
Can I make HADR on instance level instead of on database level?

Thanks in advance ..

1. You need cluster manager software, such as Tivoli System Automation, which comes free with DB2. This software is used to detect system problems and issue HADR takeover commands.

2. No, you cannot set up HADR at the instance level.

Thanks very much

but i read little about TSA and i found that it need shared

if my information is true, is there were another way to apply TSA and avoid using shared ?
else could u clarify the idea of TSA or give me link that help me more.

I cannot give you a link (try google), but I am fairly sure that it can be setup with or without a shared disk, but in any case, you could easily share it via NFS mount (no SAN required).

a link and many more
Configuring a cluster using db2haicu
tsa can use a shared disk as tiebraker, default is network
there is a doc in developerswork also about this setup.. have a look