HP RAID Software for OpenVMS provides ways to configure and
use disk drives so that they achieve improved I/O performance. RAID
(redundant arrays of independent disks) uses striping technology
to chunk data and distribute it across multiple drives. RAID software
is available in various levels, one of which is volume shadowing.
RAID Levels describes RAID levels.
Table 1 RAID Levels
RAID Level
Description
Level 0
Striping with no redundancy.
Level 1
Shadowing.
Levels 0 +
1
Striping and shadowing together.
Level 3
Striped data with dedicated
parity drive. Drives are rotationally synchronized.
Level 5
Striped data and parity.
Level 6
Striped data and parity with two parity
drives.
Shadowing striped drives can increase both performance and
availability, because you can achieve faster response time with
striping and data redundancy with shadowing. In addition to shadowing
striped sets, you can also stripe shadow sets. Each strategy offers
different advantages and tradeoffs in terms of availability, performance,
and cost.
For the latest information about HP RAID Software for OpenVMS,
refer to the following web page: