[Gluster-users] Cheers and some thoughts

Joe Julian joe at julianfamily.org
Thu Jan 5 23:33:28 UTC 2017

On 01/05/17 11:32, Gandalf Corvotempesta wrote:
> Il 05 gen 2017 2:00 PM, "Jeff Darcy" <jdarcy at redhat.com 
> <mailto:jdarcy at redhat.com>> ha scritto:
>     There used to be an idea called "data classification" to cover this
>     kind of case.  You're right that setting arbitrary goals for arbitrary
>     objects would be too difficult.  However, we could have multiple pools
>     with different replication/EC strategies, then use a translator like
>     the one for tiering to control which objects go into which pools based
>     on some kind of policy.  To support that with a relatively small
>     number of nodes/bricks we'd also need to be able to split bricks into
>     smaller units, but that's not really all that hard
> IMHO one of the biggest drawback in gluster is the way it manage bricks
> Adding the ability to add one server per time without having to 
> manually rebalance or similiar would be usefully
> Both ceph and lizard manage this automatically.
> If you want, you can add a single disk to a working cluster and 
> automatically the whole cluster is rebalanced transparently with no 
> user intervention
> This is really usefully an much less error prone that having to 
> manually rebalance all the things

That's still not without it's drawbacks, though I'm sure my instance is 
pretty rare. Ceph's automatic migration of data caused a cascading 
failure and a complete loss of 580Tb of data due to a hardware bug. If 
it had been on gluster, none of it would have been lost.
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