Re: [Gluster-devel] Gluster Recovery

[Anand Avati]

> 
> The concern here is the following though:
> 
> Two separate clients are identically configured to use AFR to two identical 
> server configurations as follows:
>              Server1
>            /         \
> Client1 ---           ---Client2
>            \         /
>              Server2
> 
> Client1 puts "hello.c" onto both Server1 and Server2 via AFR.  Client2 then 
> changes hello.c in some way.
> Server1 goes down; data lost, no chance of recovery and is replaced by 
> Server3, a brand new server with fresh disks.
> In this case, how does the data get reconstructed from the client's side 
> because you mentioned that the automatic recovery was going to be on the 
> glusterfs side.  Client1 believes hello.c is something different to what 
> Client2 believes.  Which client will responsibly reconstruct the data?  Will 
> the journaling of the remaining servers be used to reconstruct the data on 
> the new server?

'changes' are done in sync on both server1 and server2 always
(writes()s are sent to all child nodes). when server3 comes in place
of server1, the self-heal should detect that hello.c is missing on
server3 and sync it from server2.



regards,
avati

-- 
ultimate_answer_t
deep_thought (void)
{ 
  sleep (years2secs (7500000)); 
  return 42;
}