Hitachi AMS 2000 User Manual page 228

point-in-time logical copy
A logical copy or snapshot of a volume at a point in time. This enables a
backup or mirroring application to run concurrently with the system.
pool volume
Used to store backup versions of files, archive copies of files, and files
migrated from other storage.
primary or local site
The host computer where the primary volume of a remote copy pair
(primary and secondary volume) resides. The term "primary site" is
also used for host failover operations. In that case, the primary site is
the host computer where the production applications are running, and
the secondary site is where the backup applications run when the
applications on the primary site fail, or where the primary site itself
fails.
primary volume (P-VOL)
The storage volume in a volume pair. It is used as the source of a copy
operation. In copy operations a copy source volume is called the P-VOL
while the copy destination volume is called "S-VOL" (secondary
volume).
P-VOL
See primary volume.
R
RAID
Redundant Array of Independent Disks. A disk array in which part of
the physical storage capacity is used to store redundant information
about user data stored on the remainder of the storage capacity. The
redundant information enables regeneration of user data in the event
that one of the array's member disks or the access path to it fails.
Recovery Point Objective (RPO)
After a recovery operation, the RPO is the maximum desired time
period, prior to a disaster, in which changes to data may be lost. This
measure determines up to what point in time data should be recovered.
Data changes preceding the disaster are preserved by recovery.
Recovery Time Objective (RTO)
The maximum desired time period allowed to bring one or more
applications, and associated data back to a correct operational state. It
defines the time frame within which specific business operations or data
must be restored to avoid any business disruption.
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Hitachi AMS 2000 Family TrueCopy Extended Distance User Guide
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