Re: bdr replication

Hello Alvaro,
We running BDR where each PostgreSQL vm is a master and shared storage only on hypervisor level. All vm leave with own virtual disk. Right now we have 2 server for redundancy which have shared network between them. Issue that BDR is working right now see log below. And my question how to restore BDR replication correctly.

volga629

From: "Alvaro Aguayo Garcia-Rada" <aaguayo(at)opensysperu(dot)com>
To: "volga629" <volga629(at)skillsearch(dot)ca>
Cc: "pgsql-general" <pgsql-general(at)postgresql(dot)org>, "John R Pierce" <pierce(at)hogranch(dot)com>
Sent: Thursday, 31 March, 2016 02:19:42
Subject: Re: [GENERAL] bdr replication

What's the purpose of such configuration? Doesn't makes sense for me. The only reasonable case where you would want to put the data folder on a shared storage is for usage with warm standby, where you can have a secondary server which serves as a read-only replica, and can be rpomoted to master on master failure.

If you intend high availability, you'd rather try it at VM level, like vmware HA or Proxmox HA. That will make your VM run on any hypervisor in the group disregarding the failure of some node.

Regards,

Alvaro Aguayo
Jefe de Operaciones
Open Comb Systems E.I.R.L.

Oficina: (+51-1) 3377813 | RPM: #034252 / (+51) 995540103 | RPC: (+51) 954183248
Website: www.ocs.pe

----- Original Message -----
From: "Slava Bendersky" <volga629(at)skillsearch(dot)ca>
To: "John R Pierce" <pierce(at)hogranch(dot)com>
Cc: "pgsql-general" <pgsql-general(at)postgresql(dot)org>
Sent: Wednesday, 30 March, 2016 10:57:13 PM
Subject: Re: [GENERAL] bdr replication

In my case only virtual hosts are use share storage (feed from glusterfs), but actual virtual machines have own separate disks and all PostgreSQL run on separate data directories.

volga629

----- Original Message -----

From: "John R Pierce" <pierce(at)hogranch(dot)com>
To: "pgsql-general" <pgsql-general(at)postgresql(dot)org>
Sent: Thursday, 31 March, 2016 00:34:55
Subject: Re: [GENERAL] bdr replication

On 3/30/2016 8:09 PM, Slava Bendersky wrote:
> Is any share storage technology recommended for PostgreSQL in virtual
> environment ?
> Ok what I will do is going take backups, shutdown both virtual servers
> and place all vm use local disk on server only.

'share storage technology'... um. thats such a vague term, it can
mean lots of things.

each postgres instance needs its own data store, two instances can NOT
share the same files under any condition. these data stores can be
on SAN or NAS, as long the storage is reliable about committed random
writes, and as long as two different servers aren't using the SAME
directory for their data stores.

--
john r pierce, recycling bits in santa cruz

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