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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