cluster replication between two locations

G

Gerhard W. Recher

Well-Known Member
Mar 10, 2017
158
8
58
Munich
Hi Folks,

I plan a proxmox cluster for a customer, he has a dedicated line between two location, but only 10 Mbit/s synchronous.
vm's will be (windows ad terminalserver , exchange, m$-sql server) clients connect via rdp on Terminalserver .

We want to setup a cluster on both sites , so in case one site dies (fire/Power outage/.... ) users on the other site can work with the local replicated instance.

Is this possible, or will sync traffic saturating a 10 Mbit/s line, so no regular rdp traffic will get through ?

Backup site vm's will be started manually.

any directions ?
 
Hi,

When you want data replication between 2 remote sites, the best is zfs send/receive(like incremental backup at block level). I do not know if your dedicated inter data center link speed (10 Mb/s is enough or not. In this situation your best efforts is:

- use ceph with zfs as backend (so you can do zfs replication)
- replicate very often the most important data (will be finish faster)

When your primary DC is recover after a fail, you will be able to reverse the replication ( maybe during off-work period).

Try to imagine the non-zfs scenario: maybe multi-TB sync? Or only 1 TB with multi-billion files?
 
guletz said:
Hi,

When you want data replication between 2 remote sites, the best is zfs send/receive(like incremental backup at block level). I do not know if your dedicated inter data center link speed (10 Mb/s is enough or not. In this situation your best efforts is:

- use ceph with zfs as backend (so you can do zfs replication)
- replicate very often the most important data (will be finish faster)

When your primary DC is recover after a fail, you will be able to reverse the replication ( maybe during off-work period).

Try to imagine the non-zfs scenario: maybe multi-TB sync? Or only 1 TB with multi-billion files?
Click to expand...
typical windows server ... workload tons of files in windows filesystem, dedicated sql-server, and exchange server ...
so transparent blockdevice replication would be best ....
existing line 10mbit/s leased line is now only used for 15 Workstations RDP traffic.. QoS is just not really possible (no layer-3 switch at customer site...)
 
The first thing, that you need to check, is how much data is read/written in time. 10mbps is very low for anything as replication.
 
I am looking for the same kind of solution, though I have a faster line to the remote site. Has anyone actually done anything like this, with CEPH?
 
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