SDS (thing)

Disksuite is nowhere near as flexible as veritas volume manager. It works with slices/partitions on the systems' disks. Veritas, on the other hand, creates virtual slices inside a single slice called the "public region" and manipulates those. This allows Veritas to use an almost unlimited number of "slices" where SDS is stuck with a maximum of 7 per disk by the operating system. This slice limitation is the great weakness of SDS.

SDS excels at simple mirroring and striping. For anything much more complicated than basic redundancy and extending filesystems, though, you probably want Vxvm.