> On Sun, 22 Oct 2006, Stephen Le wrote: > >> Is it possible to construct a RAID-10 array with ZFS? I've read through >> the ZFS documentation, and it appears that the only way to create a >> RAID-10 array would be to create two mirrored (RAID-1) emulated volumes >> in ZFS and combine those to create the outer RAID-0 volume. >> >> Am I approaching this in the wrong way? Should I be using SVM to create >> my RAID-1 volumes and then create a ZFS filesystem from those volumes? > > No - don't do that. Here is a ZFS version of a RAID 10 config with 4 > disks: > > ----- from 817.2271.pdf --------- > > Creating a Mirrored Storage Pool > > To create a mirrored pool, use the mirror keyword, followed by any number > of storage devices that will comprise the mirror. Multiple mirrors can be > specied by repeating the mirror keyword on the command line. The > following command creates a pool with two, two-way mirrors: > > # zpool create tank mirror c1d0 c2d0 mirror c3d0 c4d0 > > The second mirror keyword indicates that a new top-level virtual device is > being specied. Data is dynamically striped across both mirrors, with data > being replicated between each disk appropriately. >
We need to keep in mind that the exact same result may be achieved with simple SVM : d1 1 2 /dev/dsk/c1d0s0 /dev/dsk/c3d0s0 -i 512b d2 1 2 /dev/dsk/c2d0s0 /dev/dsk/c4d0s0 -i 512b d3 -m d1 metainit d1 metainit d2 metainit d3 metattach d3 d2 At this point, if and only if all stripe components come from exactly identical geometry disks or slices, you get a stripe of mirrors and not just a mirror of stripes. 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. However ZFS brings a lot of other great features. Dennis Clarke _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
