HP NetRAID-4M Configuration and Upgrade Guide (Release 5)

Chapter 10 Glossary

Duplex (simple) - A special case of RAID-1 where the drives are on separate

channels (same controller) for increased fault tolerance.

Duplex (teaming) - Another special case where the drives are on separate channels

that happen to be on separate controllers. Booting from this type of duplex is

technologically difficult because it requires that the system BIOS know which pair

of the card and mirror half is good and which pair is bad.

Striping with distributed parity (RAID-5) - Three or more drives combined

together, including parity. The parity is rotated around among the members for better

performance. Fault tolerant. Good performance with less overhead compared to

RAID-1. Most RAID controllers can gang up to 16 drives together.

Volume set of stripe sets - A multi-level container. Multiple stripe sets are

combined together into a large logical drive. The stripe sets underneath are filled one

by one.

Volume set of mirror sets - A multi-level container. Multiple mirror sets are

combined together into a large logical drive. The mirror sets underneath are filled

one by one.

Volume set of RAID-5 sets - A multi-level container. Multiple RAID-5 sets are

combined together into a large logical drive. The RAID-5 sets underneath are filled

one by one.

Stripe set of mirror sets (RAID-10) - A multi-level container. Multiple mirror sets

are combined together into a large logical drive. The mirror sets underneath are filled

evenly (striped) for better performance.

Stripe set of RAID-5 sets (RAID-50) - A multi-level container. Combining

(concatenating) multiple drives together into a large logical drive. The RAID-5 sets

underneath are filled evenly (striped) for better performance.

RAID unprotected

When a container starts the scrubbing process and that process is stopped for any

reason, the container is marked “unprotected.” It will stay unprotected until an I/O

process is issued to that drive and it fails. The failed I/O will kick off a rebuild

process and the container will show as scrubbing. Scrubbing can also be started

manually.