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 is split, and then 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 disks reside in an external storage system.
R
R/W
read/write
RAID
redundant array of inexpensive disks
RAID group
A redundant array of inexpensive drives (RAID) 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, which allows
the 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 RAID 0, RAID 1,
RAID 2, RAID 3, RAID 4, RAID 5 and RAID 6.
RCU
See remote control unit (RCU).
312 Glossary
Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series
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