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.
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.
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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