[DRBD-user] see replicated data

Felix Frank ff at mpexnet.de
Thu May 31 22:00:15 CEST 2012

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


On 05/31/2012 03:10 PM, agag wrote:
> OK! So main task for DRBD is to replicate data? If main server crashes then
> Pacemaker prometes secondary? If I'll have GFS then for what do I nead DRBD?

GFS in and of itself does not give you distribution. E.g., you can mount 
one GFS from several nodes via iSCSI. Fine and good, but dual-primary 
DRBD allows both your nodes to make all reads from the local disk, no 
network involvement. There are performance benefits.

> Can DRBD also replicate ethernet interfaces? (it is not necessary becouse of
> vrrp but may be that is something what DRBD offers).

No. It's a *block* device, meaning storage only.

> I'm sorry, may be that are stupid questions but I'm not native english
> speaker - I can mix something ;)

You're doing fine.

> What does it mean stonith? I can't find it in dictionary :)

Shoot The Other Node In The Head.

It's techniques that allow one peer to shut down the other in an instant 
(e.g. by cutting its power).

It is necessary to protect yourself from split-brains: Without it, in 
case the link between the nodes breaks, each will store rapidly 
diverging data, with practically no way of recovering.


More information about the drbd-user mailing list