[Linux-cluster] Starter Cluster / GFS

Gordan Bobic gordan at bobich.net
Thu Nov 11 09:18:30 UTC 2010

Nicolas Ross wrote:
> Redundency for high-availaibility.
> If a node fail, I can restart the service manually, or automaticly on
> another node, without loosing any data.

You can do that anyway. You make the SAN exported block device and the 
non-shared FS on that share into dependent services. You make it so the 
FS service requires the block device service, and make the application 
providing service depend on the file system service. That ensures 
they'll all come up in the correct order and fail over together.

Using a shared file system gains you nothing in the use cases you are 
describing, other than reduce the performance.

> Also, there are come common data between services that need to be availaible in real-time.

That's fair enough, but in that case some volume splitting may be in 
order (have the common static data on GFS and have everything else on 
fail-over non-shared file systems). For optimal performance, you should 
unshare as much as possible.


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