HPE XP7 User Manual page 359

Pair
Two logical volumes in a replication relationship in which one volume contains original data to be
copied and the other volume contains the copy of the original data. The copy operations can be
synchronous or asynchronous, and the pair volumes can be located in the same storage system (in-
system replication) or in different storage systems (remote replication).
Parity group
See RAID group.
Pool
A set of volumes that are reserved for storing Snapshot data or Thin Provisioning write data.
Pool volume
A logical volume that is reserved for storing snapshot data for Snapshot operations or write data for
Thin Provisioning.
Port
A physical connection that allows data to pass between a host and the disk array. The number of
ports on a disk array depends on the number of supported I/O slots and the number of ports available
per I/O adapter. The XP and XP7 family of disk arrays supports Fibre Channel (FC) ports and other
port types. Ports are named by port group and port letter, such as CL1-A. CL1 is the group; A is the
port letter.
Primary volume
P-VOL. The volume in a copy pair that contains the original data to be replicated. The data on the P-
VOL is duplicated synchronously or asynchronously on the secondary volume (S-VOL).
See also secondary volume (S-VOL).
R
RAID
redundant array of independent disks. A disk array in which part of the physical storage space is used
to store user data and parity information, and another part is used to store a duplicate set of user data
and parity information. This redundant configuration prevents data loss in case a disk drive within the
RAID configuration fails, and enables regeneration of user data in the event that one of the array's
member disks or the access path to it fails.
RAID group
A set of RAID disks that have the same capacity and are treated as one group for data storage and
recovery. A RAID group contains both user data and parity information. This allows user data to be
accessed in the event that one or more of the drives within the RAID group are not available. The
RAID level of a RAID group determines the number of data drives and parity drives and how the data
is "striped" across the drives. For RAID1, user data is duplicated within the RAID group, so there is no
parity data for RAID1 RAID groups.
A RAID group can also be called an array group or a parity group.
RAID level
The type of RAID implementation. RAID levels include RAID0, RAID1, RAID2, RAID3, RAID4, RAID5
and RAID6.
RAID Manager Library (RML, RMLIB)
The RAID Manager Library is an API library that enables third-party software products to directly
operate some of the functions on the P9500/XP7 and XP disk arrays.
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