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Re: [Linux-cluster] Software RAID support by GFS



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Lin Shen (lshen) wrote:
> So with clvm in the picture, I should be able to do software raid across
> nodes, right? I'm also using gnbd in my setup, would you mind giving
> some detailed info about how to do this?
> 
> lin
>  

Only if you're going to use cmirror (cluster mirror). On its own, clvmd
just allows you to use the LVM2 tools safely in a shared storage
environment - e.g. preventing you growing an LV on one node while you
shrink it on another - it doesn't address actually getting the data
synced between devices on separate nodes.

There's some discussion of cmirror in the paper here:

http://developer.osdl.org/dev/clusters/docs/cluster_summit_mirror_paper.pdf

(a bit old, but has some useful background)

And CVS is in the cluster repository:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/cluster/cmirror/?cvsroot=cluster
http://sources.redhat.com/cgi-bin/cvsweb.cgi/cluster/cmirror-kernel/?cvsroot=cluster

Kind regards,

Bryn.
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