[sclug] Mirror disks across machines like distributed RAID?

[Simon Reap]

Dickon Hood wrote:
> How does DRBD help you in this situation?  You can't mount the same
> filesystem on two hosts, remember.
>
> I'd probably do something with NFS or the like.
>   

I do this commercially for big telecoms operators.  We currently use 
HP's ServiceGuard or RedHat Clustering to have highly-available 
NFS-shared disks, and those disks are then mounted on all of the clients 
(up to 11).  The disks themselves are on a SAN (EMC or EVA), so it is 
not a cheap solution, but when a few minutes of messaging can generates 
tens of thousands of dollars, cost is less of a problem.

Some people have suggested using XFS instead of NFS - has anyone tried this?

Simon