On 05.06.2012 21:06, Florian Haas wrote: > On Tue, Jun 5, 2012 at 8:34 PM, Arnold Krille <[email protected]> wrote: >> Luca Fornasari <[email protected]> schrieb: >>> I have already setup a two node HA Proxmox cluster configuring as per >>> <http://pve.proxmox.com/wiki/Two-Node_High_Availability_Cluster> >>> http://pve.proxmox.com/wiki/DRBD >>> So I have a primary/primary DRBD resource (yes I configured fencing >>> correctly). >> I believe that three nodes including dual-primary is probably a nightmare to >> setup and an even worse nightmare configuring a cluster to automate it... > It's not a nightmare. It's just not possible. You can sleep soundly. :) > >> As far as I was told, linbit is working on three-way drbd-replication on a >> single-layer. But there are other systems both on the block- and on the >> fs-layer that do n-way replication... > Yup. Well actually I'm not aware of anything that does n-way > multi-master at the block level, although you could say that RBD does > (not exactly correct, but close enough). Multi-master n-way filesystem > replication is available in GlusterFS.
I would count rbd of ceph and also sheepdog as n-way replication at the block-level. Although its the block-devices of virtual machines. And who needs block-level replication for something else then VMs anyway? :-) I tried HA-nfs with drbd below but went back to just providing drbd to a vm for the nfs and (re)start that vm from corosync/pacemaker. Its a bigger problem with samba as windows doesn't seem to like it when the server crashes and restarts, probably because some packets in between are answered with 'rejected'. nfs and smtp/imap are far more tolerant. But somehow I fear my eviction from this list when I always answer posts with a list of alternatives... Hint to the list-maintainers: I do have drbd running in production, I do not (yet) have one of the other in production... Have fun, Arnold -- Dieses Email wurde elektronisch erstellt und ist ohne handschriftliche Unterschrift gültig.
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