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



I think he is referring only to the CLVM Mirroring feature. AFAIK, you can
put drbd on top of a raid device with no problem.   

-----Original Message-----
From: linux-cluster-bounces redhat com
[mailto:linux-cluster-bounces redhat com] On Behalf Of Gordan Bobic
Sent: Tuesday, January 22, 2008 3:35 PM
To: linux clustering
Subject: Re: [Linux-cluster] any timeline for supporting software RAID?

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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