Enhancing Disk Performance Using RAID and Vinum
Vinum is a software RAID tool built into FreeBSD, supported by a kernel module (geom_vinum.ko). It allows you to increase the efficiency of your ATA or SCSI disks (if you have more than one) by remapping their block device interfaces to a virtual set of “synthetic” drives (or volumes), which can contain plexes that comprise each volume’s address space. A plex allows Vinum to automatically remap your data into arrangements such as RAID-1 (mirroring, which increases reliability), RAID-0 (striping, which increases performance), and RAID-5 (hybrid mirroring and striping) across the volumes constructed from your original hard disks.
Setting up Vinum is a procedure that involves a lot of manual calculations ...
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