HP StorageWorks P4000 User Manual page 207

Volume characteristic
Data Protection Level
Type
Provisioning
Configurable for
Primary or Remote
Volume
Both
Both
Primary
What it means
The data protection level indicates the number and
configuration of data copies created on storage systems
in the cluster.
There are six levels of data protection
• Network RAID-0 (None)
• Network RAID-5 (Single Parity)
• Network RAID-6 (Dual Parity)
• Network RAID-10 (2–Way Mirror)
• Network RAID-10+1 (3–Way Mirror)
• Network RAID-10+2 (4–Way Mirror)
The default value = Network RAID-10. For information
about the data protection levels, see
protection" on page 190.
• Primary volumes are used for data storage.
• Remote volumes are used for configuring Remote
Copy for business continuance, backup and recovery,
or data mining/migration.
Default value = Primary
• Fully provisioned volumes are the same size on the
SAN as the size presented to the application server.
• Thinly provisioned volumes have less space reserved
on the SAN than the size presented to the application
server. As data is stored on the volume, the SAN/iQ
software automatically increases the amount of space
allocated on the SAN.
The default value = Full for the following data protection
levels.
• Network RAID-0 (None)
• Network RAID-10 (2–Way Mirror)
• Network RAID-10+1 (3–Way Mirror)
• Network RAID-10+2 (4–Way Mirror)
The default value = Thin for the following data protection
levels.
• Network RAID-5 (Single Parity)
• Network RAID-6 (Dual Parity)
Thin provisioning is the best practice configuration for
Network RAID-5 and Network RAID-6 volumes.
NOTE:
The SAN/iQ software allocates space as needed.
However, thin provisioning carries the risk that, if
all warnings are ignored, an application server will
fail a write because the SAN has run out of disk
space.
P4000 SAN Solution user guide
"Planning data
207