
374 DS8800 Performance Monitoring and Tuning
Figure 9-10 Veritas Volume Manager (VxVM) overview
The DS8000 LUNs that are under the control of VxVM are called VM Disks. You can split
those VM Disks in smaller pieces that are called
subdisks. A plex looks like a mirror and
consists of a set of subdisks. It is at the plex level that you can configure RAID 0, RAID 5, or
simply concatenate the subdisks. A volume consists of one or more plexes. When you add
more than one plex to a volume, you can implement RAID 1. On top of that volume, you can
create a filesystem or simply use it as a raw device.
To set up the volume layout with the DS8000 LUNs, you ...