HP StorageWorks P4000 User Manual page 328

network RAID Synchronous replication, mirroring or parity protection on a volume-by-volume
basis. Protecting data for a volume across all storage systems in the cluster.
Network RAID-10, 10+1 or 10+2 is required to protect data in an HP P4000
SAN solution.
network window Graphically depicts the status of each storage system. Storage systems on the
network are either available or part of a management group.
NTP Network Time Protocol
parity In RAID 5, redundant information is stored as parity distributed across the disks.
Parity allows the storage system to use more disk capacity for data storage.
peer site Absence of a primary site designation makes all the sites peer sites.
primary site A site designation assigned by the administrator in the HP StorageWorks P4000
Centralized Management Console. A primary site is more important than a
secondary site. In this setup, you would run a majority of managers in the primary
site. In a two-site setup, this allows the primary site to stay online even if the
network link between the primary and secondary sites fails. Typically, the primary
site has majority/all of the application servers. In configurations that do not
designate a primary site, the sites are referred to as "peer" sites.
original primary The primary volume that fails and then is returned to service.
volume
overprovisioned An overprovisioned cluster occurs when the total provisioned space of all volumes
cluster and snapshots is greater than the physical space available on the cluster. This
can occur when there are snapshot schedules and/or thinly provisioned volumes
related to the cluster.
point-in-time Snapshots that are taken at a specific point in time, but an application writing
snapshot to that volume may not be quiesced. Thus, data may be in flight or cached and
the actual data on the volume may not be consistent with the application's view
of the data.
preferred interface A preferred interface is the interface within an active backup bond that is used
for data transfer during normal operation.
primary snapshot A snapshot of the primary volume which is created in the process of creating a
remote snapshot. The primary snapshot is located on the same cluster as the
primary volume.
primary volume The volume which is being accessed (read/write) by the application server. The
primary volume is the volume that is backed up with Remote Copy.
quorum A majority of managers required to be running and communicating with each
other in order for the SAN/iQ software to function.
RAID device RAID (originally redundant array of inexpensive disks, now redundant array of
independent disks) refers to a data storage scheme using multiple hard drives
to share or replicate data among the drives.
RAID levels Type of RAID configuration:
•
•
•
328 Glossary
RAID 0 - data striped across disk set
RAID 1 - data mirrored from one disk onto a second disk
RAID 10 - mirrored sets of RAID 1 disks