I run servers for my self as a embedded systems developer and for my family. I'm trying to increase the long term reliability by moving from a master/slave pair of Cent OS servers to a High Availability cluster of 4 servers. For storage I was considering a pair of Link Station Pro Quad NAS. They appear to be built on a good platform and have a reasonable price. There is only mention of support for Windows and Apple clients. Given the underlying OS on them is Linux I was hoping they would also support Linux. NFS is often offered to do that but it looks like the "quorum disk device" I need is more specific than that. To quote from the Red Hat's documentation:
A quorum disk device should be a shared block device with concurrent read/write access by all nodes in a cluster. The minimum size of the block device is 10 Megabytes. Examples of shared block devices that can be used by qdiskd are a multi-port SCSI RAID array, a Fibre Channel RAID SAN, or a RAID-configured iSCSI target.
My experience with block devices is they are locally mounted drives where as NAS unit present a higher level access. Has anyone experience with working such a configuration? Can this be done with a Link Station Pro Quad NAS or will have to build my own NAS from scratch?