Hi all,
We run glusterFS in our testing lab (since 2.0rc1). We are currently
using client-side AFR (mirror) with two server and two clients over GigE.
Testing is going well except one important point: How do you upgrade
with minimal/zero downtime? Here I have several questions:
1. Is the wire-protocol stable during major releases? Can I mix and
match all 2.0.x client/servers? If not how do find out which one are
compatible?
2. Can I export one directory on the servers through multiple instances
of glusterfsd (running on different ports)? This would allow to run old
and new version in parallel for a short time and do a test from the client.
3. How do I restart clients without shutting down all services accessing
the mountpoint? Will glusterfs re-read config via signals (HUP)? Or is
it OK to kill/restart in one go?
How do YOU handle upgrades, especially wrt downtime and rolling back to
a known good configuration?
cheers and thanks in advance
Paul
BTW: I have automated most of compile/install/confgen/start/stop on
multiple clients/servers via bash/ssh. If someone is interested I could
share it here.
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