On Thu, Apr 28, 2005 at 12:11:37PM +0200, miele@xxxxxxxxx wrote: > > Hi. > ... > All is wonderful but.. when all seems ok and my work seems to be finished.. > ..I'm having hard doubts on this RAID configuration and its stability. With good reason - there is no way that this can work reliably. > I fear that RAID SW modules that runs on each of two Linux nodes, and > works on the same data of the shared disk array, could produce > conflicts, misalignments, or I don't know what other.. This is exactly what will happen. It will not work. > > Can you give me a comment or suggests about RAID SW use i've made? > You cannot share storage between multiple SW RAID "masters". If you take SW RAID and LVM out of the equation, you will still have problems with the filesystem - you cannot share storage between two nodes by mounting the same storage. Again, both nodes will write to the journal with no synchronization between them, both will cache data locally with no cache synchronization, etc. etc. Disaster lies ahead. Look into GFS for a solution to the filesystem problem. You can use some of the linux-ha stuff to make sure that only one node at a time will actually use the underlying storage, if that is an acceptable solution (pure fail-over). But all in all, there's no plug'n'play solution for what you're trying to accomplish. Personally, I think I'd get a "storage box" which did the RAID for me (that could be an off the shelf iSCSI/FC box, or it could be another Linux box exporting a software RAID over iSCSI, it could be a lot of things depending on your needs and budget), then, I'd look into GFS or Oracle's recently opensourced shared filesystem for the shared filesystem. Maybe others on this list have better suggestions. But first of all; stop what you are doing now, you are hurting yourself and your data ;) -- / jakob - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
