[Linux-cluster] any timeline for supporting software RAID?

[Jeff Wasilko]

Could someone comment on the potential timeline for supporting  
software raid in CLVM? Any hopes of it soon?

Thanks!

(from http://www.redhat.com/magazine/009jul05/departments/tips_tricks/ )


Does Red Hat Cluster Suite support software RAID (like Veritas and HP)?
by John Berninger

At the present time, software RAID drivers are not supported in the  
Red Hat Cluster Suite (RHCS) due to state maintenance issues between  
nodes.

The present versions of mdadm and RHCS are unable to transfer state  
information from one node to another in a cluster, so the node not  
actively using the file system is unable to determine the status of  
the RAID in case of a fence or STONITH operation. This inability  
could lead to file system corruption if a state is calculated  
incorrectly, which would likely be worse than not having the RAID in  
place in the beginning.

Red Hat engineers are working on a new volume manager, the Cluster  
Logical Volume Manager (CLVM), which will enable the use of LVM on  
shared storage. Once this work is complete, finalized testing and  
quality assurance will begin on making multi-pathed CLVM available  
for production use, which will act in place of software RAID in a  
cluster environment, providing similar functionality through  
different means. 
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