Dear AFS'ers
We're running a small AFS cell since last Fall and about to
re-organize our cell's servers. About database server functions I have
some questions.
We have somewhat frequent network outages between buildings
which are computer center and laboratory building A and B. Until now,
all the 3 database servers have been located in computer center. So when
the network service to computer center has disconnected, no AFS users
can't login in lab-builing A and B. (Let's assume the home directory
are located in file servers running in each building)
In order to fix that problem, we're going to distribute 3 database
servers so that one database server can be placed in each building. In
this situation, I'm curious whether we can login in spite of the same
network outages. (Let's assume the lowest IP-address database server is
located in computer center.)
1) What if the network between computer center and building A is
disconnected ? I know that as far as two of the three database servers can
communicate each other, there could be the 'sync site' and users can login.
in computer center and building B. But I wonder what happens to the users
in the building A. Can they login with the information of the database
server in building A or not ? The admin manual says that the database server
which can't get majority votes does not provide DB info to clients. Is it
true ? All the clients in building A want to do is to read the DB info,
not to change them.
2) Let's consider about clients. The manual says that client machine
chooses the database server *randomly* when it boots up. If so, can the
client switch to the new database server when the original database server
can not provide informations no longer due to some reasons; network outages,
server process crashes, etc... ?
3) Ah.. one more should be added to #1 question. If it true
that users in building A can't login in such situation and the situations
are very frequent, how can you solve that kind of problem ? Please give me
some tips... ^_^
I'm more than curious and hope there would be a good solution.
Sincerely,
Jay Kim
from Korea...
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| * * ** * * ** | Remember Yesterday, Dream about Tomorrow
| * * * * * * * * | but ... LIVE TODAY !!!
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|_ * * * * * * _| [EMAIL PROTECTED] (Jae-young Kim)
((_) * ** * ** (_)) NDS Lab., PIRL/POSTECH, KOREA
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