On 31 jan 2008, at 19:07, Bob Doolittle wrote:
Hi,
A few questions inline:
Christer Bernérus wrote:
Hi.
Today I tried to form a server failover group out of three solitary
servers.
How? What actions did you perform?
I did a utreplica -p <secondary server list> on the primary server,
then a utreplica -s <primary server> on the scondary servers.
This cmmand complained about not finding a port and gave me the option
o continuing by answering a question about
which version was running on the primary. This was version 3.1.1
(Linux RHAS btw)
These had active sessions on them. It didn't turn out too well,
leaving hordes of disconnected DTU's looking for their lost
session, but never being able to connect to them.
What does this mean, exactly? Were the disconnected DTUs
showing an icon of some sort? What number was displayed in the
lower-right corner?
I actually didn't see this myself. I got a report on the phone from
our servicedesk.
Then I checked using utsession -p and all connections were marked "D"
and just "D"
If you ran utgroupsig and give all servers the same signature,
this ought to have worked.
Yes, that was what I expected too. I thought I did give the same sig.
What happens if I didn't ?
In panic I reverted the secondary servers to solitary service by
running utreplica -u, utconfig -u (which was scary as hell!) and
then utconfig to configure the servers back again. By divine
interaction, luck or just because it was designed this way, the
user's sessions actually survived this operation, and eventually
most of the users got their sessions back.
We run the servers on the public network, wit a separate DHCP
server, so there were no interconnect or DHCP issues issues involved.
So, the question is, what is the proper procedure here? I want to
form a failover group out of some already running servers?
Are your servers within a single broadcast domain (subnet)? Or
are you relying on multicast to communicate across subnets?
All of the servers in this group are on a single subnet, yes.
-- Christer
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