This may not really be a subject ceph-devel mailinglist but rather a
potential ceph-users? I hope it is ok to write here. I would like to
discuss the if it sounds reasonable to run a Ceph cluster distributed over
a metro (city) network.
Let us assume we have a couple of sites distributed over a metro network
with at least gigabit interconnect. The demands for storage capacity and
speed at our sites are increasing together with the demands for reasonably
stable storage. May Ceph be a port of a solution?
One idea is to set up Ceph distributed over this metro network. A public
service network is announced at all sites, anycasted from the storage
SMB/NFS/RGW(?)-to-Ceph gateway. (for stateless connections). Statefull
connections (iSCSI?) has to contact the individual storage gateways and
redundancy is handled at the application level (dual path). Ceph kernel
clients contact the storage servers directly.
Hopefully this means that clients at the sites with a storage gateway will
contact it. Clients at a site without a local storage gateway, or when the
local gateway is down, will contact a storage gateway at another site.
Hopefully not all power and network at the whole city will go
down at once!
Does this sound reasonable? It should be easy to scale up with more
storage nodes with Ceph. Or is it better to put all servers in the same
server room?
Internet
| |
Routers
| |
Metro network =============================
| | | | | |
Sites R R R R R R
| | | |
Servers Ceph1 Ceph2 Ceph3 Ceph4
--jerker
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