> Dennis Clarke wrote: >> While ZFS may do a similar thing *I don't know* if there is a published >> document yet that shows conclusively that ZFS will survive multiple disk >> failures. > > ?? why not? Perhaps this is just too simple and therefore doesn't get > explained well.
That is not what I wrote. Once again, for the sake of clarity, I don't know if there is a published document, anywhere, that shows by way of a concise experiment, that ZFS will actually perform RAID 1+0 and survive multiple disk failures gracefully. I do not see why it would not. But there is no conclusive proof that it will. > Note that SVM (nee Solstice Disksuite) did not always do RAID-1+0, for > many years it would do RAID-0+1. However, the data availability for > RAID-1+0 is better than for an equivalent sized RAID-0+1, so it is just > as well that ZFS does stripes of mirrors. > -- richard My understanding is that SVM will do stripes of mirrors if all of the disk or stripe components have the same geometry. This has been documented, well described and laid out bare for years. One may easily create two identical stripes and then mirror them. Then pull out multiple disks on both sides of the mirror and life goes on. So long as one does not remove identical mirror components on both sides at the same time. Common sense really. Anyways, the point is that SVM does do RAID 1+0 and has for years. ZFS probably does the same thing but it adds in a boatload of new features that leaves SVM lightyears behind. Dennis _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
