On Wed, Jun 27, 2007 at 03:54:07PM +1200, Rohit Grover wrote: > Hello, > > We'd like to run GFS in a cluster serviced by a pool of iSCSI disks. > We would like to use RAID to add redundancy to the storage, but > there's literature on the net saying that linux's MD driver is not > cluster safe. Since CLVM doesn't support RAID, what options do we > have other than pairing the iSCSI disks with DRBD? Ok, couple of notes: * MD is only unsafe in a cluster if it's used on multiple cluster nodes. That is, it should be fairly easy to implement a resource agent which assembles MD devices from network block devices - on one node at a time. * DRBD only will work with two writers (if 0.8.x+). I'm not sure how many mirror targets you can maintain. * Aren't most iSCSI targets RAID arrays already (?) -- Lon Hohberger - Software Engineer - Red Hat, Inc. -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
