HP MSA 2040 SAN Storage - Manual (Page 30)

30 Glossary
primary site A primary site is a production environment that provides business-critical datacenter
services. In a replication environment, the primary site can be any site where HP MSA
Remote Snap replication software supports a critical business need. Another term for
protected site. See also primary volume.
primary volume The volume that is the source of data in a replication set and that can be mapped to hosts.
For disaster recovery purposes, if the primary volume goes offline, a secondary volume can
be designated as the primary volume. The primary volume exists in a primary vdisk in the
primary (or local) storage system.
protected site A protected site provides business-critical datacenter services. The protected site can be any
site where vCenter supports a critical business need. See also protected site.
proxy volume A virtual volume in the local system that represents a volume in a remote system. Proxy
volumes are used internally by the controllers to perform actions such as transferring
replication data.
recovery site A recovery site is an alternative facility in a replication environment to which services and
data can be migrated from a protected site. The recovery site can be located thousands of
miles away. The recovery site is usually located in a facility that is unlikely to be affected by
environmental, infrastructure, or other disturbances that affect the protected site.
remote replication Asynchronous (batch) replication of block-level data from a volume in a primary system to a
volume in one or more secondary systems by creating a replication snapshot of the primary
volume and copying the snapshot data to the secondary systems via Fibre Channel links.
The capability to perform remote replication is a licensed feature (Remote Snap).
remote system A management object on the local system that enables the MCs in the local system and in
the remote system to communicate and exchange data.
replication image A conceptual term for replication snapshots that have the same image ID in primary and
secondary systems. These synchronized snapshots contain identical data and can be used
for disaster recovery.
replication set Associated primary and secondary volumes that are enabled for replication and that
typically reside in two physically or geographically separate storage systems. See primary
volume and secondary volume.
replication snapshot A special type of snapshot, created by the remote replication feature, that preserves the
state of data of a replication set’s primary volume as it existed when the snapshot was
created. For a primary volume, the replication process creates a replication snapshot on
both the primary system and, when the replication of primary-volume data to the secondary
volume is complete, on the secondary system. Replication snapshots are unmappable and
are not counted toward a license limit, although they are counted toward the system’s
maximum number of volumes. A replication snapshot can be exported to a regular,
licensed snapshot. See also replication sync point.
replication sync point The state of a replication snapshot whose corresponding primary or secondary snapshot
exists and contains identical data. For a replication set, four types of sync point are
identified: the only replication snapshot that is copy-complete on any secondary system is
the “only sync point”; the latest replication snapshot that is copy-complete on any
secondary system is the “current sync point”; the latest replication snapshot that is
copy-complete on all secondary systems is a “common sync point”; a common sync point
that has been superseded by a new common sync point is an “old common sync point.”
SAS Serial Attached SCSI interface protocol or disk-drive architecture.
SATA Serial ATA disk-drive architecture.
SC Storage Controller. The processor (located in a controller module) that is responsible for
RAID controller functions. The SC is also referred to as the RAID controller.
secondary site A backup or recovery site in a replication environment. The secondary site is usually
located in a facility that is unlikely to be affected by environmental, infrastructure, or other
disturbances that affect the protected site. Another term for recovery site. See also
secondary volume.