Quorum Disk - Hitachi G200 User Manual

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 at the
primary site fail, or where the primary site itself fails.
primary storage system
The local storage system.
primary volume
The volume in a copy pair that contains the original data to be replicated. The data in
the primary volume is duplicated synchronously or asynchronously on the secondary
pairs.
The following Hitachi products use the term P-VOL: Device Manager - Storage
Navigator, Thin Image, ShadowImage, TrueCopy, and Universal Replicator.
See also secondary volume (S-VOL).
P-site
primary site
P-VOL
See primary volume.
Q
quick format
The quick format feature in Virtual LVI/Virtual LUN in which the formatting of the
internal volumes is done in the background. This allows system configuration (such as
defining a path or creating a TrueCopy pair) before the formatting is completed. To
execute quick formatting, the volumes must be in blocked status.
quick restore
A reverse resynchronization in which no data is actually copied: the primary and
secondary volumes are swapped.
quick split
A split operation in which the pair becomes split immediately before the differential data
is copied to the secondary volume (S-VOL). Any remaining differential data is copied to
the S-VOL in the background. The benefit is that the S-VOL becomes immediately
available for read and write I/O.

quorum disk

Used to determine the volume in the global-active device pair on which server I/O
should continue when a failure occurs in a path or a storage system. Quorum disk is
installed in an external storage system.
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Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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