[DRBD-user] DRBD with CentOS in Production?

James MacLachlan james at pcmsite.net
Wed Aug 14 18:40:47 CEST 2013

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On 8/14/13 11:37 AM, Brian Candler wrote:
> On 14/08/2013 15:58, Christian Völker wrote:
>> Hi all,
>> I'm planning to use DRBD in a production environment. I prefer to use
>> CentOS as base system.
>> The reason to use drbd is the synchronisation, not the high 
>> availability.
>> We'll have two locations connected through a 100Mbit line. On both
>> locations users will access the data at the same time. So I know I have
>> to use a cluster aware filesystem.
> You mean, you are planning to use DRBD in dual-master mode??
> Why not just have all the accesses go to one master node in one data 
> centre? Then you can use a regular filesystem, with something like NFS 
> on top, and you can still replicate to a slave.
This would be the best option, or a chunk fs might be better, still 
having a single master entry point is the key.
> Perhaps you expecting a very read-heavy workload, and you want all 
> reads to take place from the nearer copy? Using DRBD + dual master + 
> GFS is a risky way of achieving this, and as the GFS nodes will have 
> to communicate to grab locks anyway, it may not have much better 
> latency than the simple case.
I agree with this, I think you will have issues with locking.  DLM, 
proto C and OCFS2 in the same data center is questionable with multiple 
>> Which filesystem is recommended? GFS? ZFS (experimental?)?
> Apples and oranges. GFS and OCFS2 are cluster-aware filesystems which 
> you may be able to use in a multi-master scenario - if you are braver 
> than me. ZFS is a standard filesystem which you could only use in a 
> single-master setup. The Linux ZFS port is also a somewhat risky 
> option; if you want to use ZFS I'd suggest FreeBSD (or a FreeBSD-based 
> appliance like FreeNAS)

> Regards,
> Brian.
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