Subject: Re: [vserver] cluster file system and vserver
From: ADNET Ghislain <gadnet@aqueos.com>
Date: Thu, 17 Jul 2008 08:04:28 +0200
Thu, 17 Jul 2008 08:04:28 +0200

> Simple, glusterfs AFR does not prevent split brain operation.  AFR is well suited
for clusters where nodes rarely go down and can be expected to come back up before any
others go down and where network outages are very unlikely.  Glusterfs AFR really is
a very simplistic node replication algorithm that is meant more for providing high availability
but it does not yet ensure consistent data.  If you have lots of disks and can do AFR
with several copies (more than 2) than it might be safer, but that might also kill you
performance.  Search or ask on the glusterfs mailing list if you want to know more why
AFR might not be a good idea for this.
>   

For whoever might be interested here is the AFR explanation:

http://www.gluster.org/docs/index.php/Understanding_AFR_Translator

the split brain part is in the road map for version 1.5.

-- 
Cordialement,
Ghislain


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