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

[Gordan Bobic]

Actually, can somebody elaborate what this means?

Does it mean that it isn't possible to put a DRBD on top of a /dev/mdX 
device?

Gordan

Jeff Wasilko wrote:
> 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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