HP NetRAID 1 Controller - Manual (Page 11)

7
Valid RAID Level Changes
To make practicable RAID level changes with HP NetRAID, observe the possible valid RAID level
changes listed in the following table when altering a physical drive or logical drive.
Existing RAID
Configuration Valid RAID
Configuration Change Configuration Event
RAID 3 or RAID 5 Optimal RAID 3 or RAID 5 Optimal Expanding capacity
RAID 3 or RAID 5 Optimal RAID 0 Stopping parity
RAID 3 or RAID 5 Optimal RAID 0 Deleting a drive, or adding drives
RAID 3 or RAID 5 RAID 3 or RAID 5 Optimal If a drive fails, you can configure an
Optimal RAID 0 system.
RAID 1 Optimal RAID 3 or RAID 5 Optimal Adding drives
RAID 1 Optimal RAID 0 Adding drives, or deleting a drive
RAID 1 Degraded RAID 0 If a drive fails, you can configure an
Optimal RAID 0 system
RAID 0 RAID 3 or RAID 5 Optimal Adding drives
RAID 0 RAID 1 Optimal Adding a drive
RAID 0 RAID 0 Adding drives
HP NetRAID Valid RAID Configuration Changes
C. Monitor Feature
Monitors send SNMP error messages to the HP NetRAID Assistant or the HP NetServer Assistant if
the disk array is not functioning properly.
Disk array monitors are provided for all operating systems. For information on SNMP agents (the
part of the system that performs information preparation and exchange on behalf of a client or
server) or server standalone, refer to HP NetServer Assistant. Monitors are installed with the
NetRAID utilities, and are included as part of the utility installation process.
Refer to your operating system information and the section Installing HP NetRAID Utilities for
information on installation. Refer to the section Troubleshooting for a list of monitor alerts.
D. Check Consistency Feature
Check Consistency ensures that parity data or mirroring is correct for the selected drives. RAID
levels 3, 5, 30 and 50 use an extra drive to store parity data blocks. Parity is checked between these
parity data blocks and the selected drives when you select this option. RAID levels 1 and 10 use
duplicate data drives; the duplicate data is verified.
NOTE It is strongly recommended that you run a regular consistency check (every 2 - 4
weeks) to ensure that good blocks on hard disk drives are reallocted. Bad blocks
which accumulate can cause rebuild failures is a drive fails.