Re: Support for DRDB

On 16/01/15 07:29 PM, Dimitri Maziuk wrote:
> On 01/16/2015 05:33 PM, Digimer wrote:
>
>> 1. CentOS replicates RHEL, "warts and all".
>
> Not exactly. E.g. gluster is a for-pay RHEL add-on. There's some kind of
> gluster rpm in Centos but it's pretty much disfunctional: you have to
> remove that, add the upstream gluster repo and get your gluster from there.

I don't use gluster myself, so I can make no intelligent comment on 
this. All I can say is that, in general, CentOS aims to repackage RHEL 
RPMs exactly, then changes only trademarks. Gluster is, as I understand 
it, fully open source so I can see no reason, from a general position, 
why gluster's RPMs on CentOS should be treated any differently.

>> 2. DRBD is an HA technology, ceph/gluster are cloud technologies.
> ...
>> from what I've gathered, ceph/gluster shine brightest when they're
>> on top of many nodes. Their goal is, first, scalability and resource
>> utilization. DRBD's is, first, data protection.
>
> More or less. IRL they apparently shine on top of a 10Gb network. Or
> better, three 10Gb networks. DRBD works just fine over a crossover piece
> of cat-5e.

I use it extensively on both 1 Gbps copper (always through a switch) and 
10 Gbps SFP+ (again, always through a switch). In all cases, I use dual 
links in simple mode=1 (active/passive) bonding with each leg to a 
different switch in a stacked pair.

In both cases, I can get replication speeds very very close to the 
maximum the underlying network is capable of. So in this light, I am not 
really sure what issues you might be referencing are. Can you expand on 
your comments?

>> Again, my understanding only, I could be wrong.
>
> Oh, it's a pure speculation on my part. Any resemblance to the actual
> RedHat is purely coincidental and all that. ;)

:p

-- 
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without 
access to education?
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