On Fri, May 11, 2001 at 01:26:31PM +0800, tin wrote:
> thank you very much Jan
> 
> where i can setup ROOTVOLUME? (size , and partition )

Ehh, this sounds like a trick question.

The name of the root volume should be in /vice/db/ROOTVOLUME on the
servers. Where this volume is created doesn't matter.

If you've got 2 or more servers, create at least a doubly replicated
volume. If the clients have both of the servers listed as root servers
they can come up and access the tree even when one of the servers is
(temporarily) down. If there is only one server, just create a singly
replicated volume, and create a new root volume when servers are added.

A lot of this stuff can be found in the "Coda File System User and
System Administrators Manual". It's a bit of a read, but it should be
worth it. (http://www.coda.cs.cmu.edu/doc/html/manual/book1.html)

Most of the time creating a replicated volume is pretty simple,

On the SCM:
# cat /vice/db/VSGDB
E0000100 server1
E0000101 server1 server2
# createvol_rep codaroot E0000101
... done.


Clients query the servers listed as "rootservers" in their configuration
file for volume location information. These servers don't necessarily
have to export a replica of the rootvolume. Basically when all the
rootservers are down a client is unable to find any volumes, however
many servers are still up and running.

Typically you'd want to avoid depending on programming bugs that take
down all servers in a VSG during resolution. So If you have 3 server
groups.

VSG1 server1,server2,server3
VSG2 server4,server5
VSG3 server6

It is probably best to set rootservers to "server1,server4(,server6)"
(pick some server in each VSG). Generally 2 servers should give enough
redundancy,

# grep rootservers /etc/coda/coda.conf
rootservers="server1,server4"

Jan