[Gluster-users] simple AFR setup, one server crashes, entire cluster becomes unusable ?

[Keith Freedman]

At 09:28 AM 12/9/2008, Stas Oskin wrote:
>Hi.
>
>Thanks for the example, but how actually server-side AFR works?
>
>I mean, when you put a file on one server, it writes to the second 
>one? And vice-versa?

yes.

client 1 updates file on server 1.  server 1 and server 2 (if AFR'ed) 
communicate and server 1 pushes file to server 2.

Client 1 reads file from server 1.  Server 1 and server 2 coordinate 
to see if they are already in sync.  if so, server 1 sends file to 
client 1.  if not server 1 gets newer version first then send to client 1.

>Regards.
>
>here's my server configs:
>
>volume home1
>  type storage/posix                   # POSIX FS translator
>  option directory /gluster/home        # Export this directory
>end-volume
>
>volume posix-locks-home1
>  type features/posix-locks
>  option mandatory on
>  subvolumes home1
>end-volume
>
>## Reference volume "home2" from remote server
>volume home2
>  type protocol/client                   # POSIX FS translator
>  option transport-type tcp/client
>  option remote-host <http://192.168.2.2>192.168.2.2       # IP 
> address of remote host
>  option remote-subvolume posix-locks-home1     # use home1 on remote host
>  option transport-timeout 10
>end-volume
>
>### Create automatic file replication
>volume home
>  type cluster/afr
>  option read-subvolume posix-locks-home1
>  subvolumes posix-locks-home1 home2
>end-volume
>
>### Add network serving capability to above home.
>volume server
>  type protocol/server
>  option transport-type tcp/server     # For TCP/IP transport
>  subvolumes posix-locks-home1
>  option auth.addr.posix-locks-home1.allow 
> <http://192.168.2.2>192.168.2.2,<http://127.0.0.1>127.0.0.1
>
>
>###I believe the following will do what you want, it's not exactly 
>the same as mine since I added the auth option for the clients 
>(192.168.1.x) to mount home--the AFR volume
>  option auth.addr.home.allow 
> <http://92.168.1.1>92.168.1.1,<http://192.168.1.2>192.168.1.2,<http://127.0.0.1>127.0.0.1 
> #
>end-volume
>
>