----- Original Message -----
> From: "James Gibbon" <[email protected]>
> To: "James Gibbon" <[email protected]>
> Cc: [email protected]
> Sent: Tuesday, July 31, 2012 8:49:52 AM
> Subject: Re: [DRBD-user] DRBD - one half of Proxmox cluster miscommunicating
>
>
> Can someone tell me what the "become-primary-on-both" part means? I'm
> fairly anxious to ensure that the second node doesn't attempt to
> become
> primary when its restarted as its data will be out of date..
>
>
> startup {
> wfc-timeout 15;
> degr-wfc-timeout 60;
> become-primary-on both;
> }
>
>
> http://www.pastedump.com/paste/2365
Just what it sounds like - both servers will be allowed to be primary at the
same time - "dual primary"
Short version - when secondary comes up it will make sure it is uptodate the it
will also be able to become primary at the same time. However you also have
settings that control what happens when the two nodes are not uptodate (these
settings are right out of the DRBD users guide for automatic split brain
recovery in a dual primary setup - links after):
net {
cram-hmac-alg sha1;
shared-secret "abcxxx";
allow-two-primaries;
after-sb-0pri discard-zero-changes;
## sb-1pri says to discard data on the secondary and resync if there has only
been the one primary since the last uptodate status
after-sb-1pri discard-secondary;
## sb-2pri says to disconnect from each other if they have both been primary
since the last uptodate - I believe this is where you are at currently. They
have both been primary when they were not connected and uptodate so DRBD is
disconnecting them so that you don't overwrite possibly good data. Manual
recovery required
after-sb-2pri disconnect;
}
More here:
http://www.drbd.org/users-guide-8.3/s-enable-dual-primary.html
http://www.drbd.org/users-guide-8.3/s-configure-split-brain-behavior.html
HTH
Jake
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