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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