protocol-independent manner. See also worldwide node name

write hit

A write operation in which the requested data is in the cache.

write penalty

The performance impact of a classical RAID-5 write operation.

WWNN

See worldwide node name.

WWPN

See worldwide port name.

X

xSeries

The product name of an IBM e(logo)server product that emphasizes industry-standard server scalability and self-managing server technologies. It is the successor to the Netfinity family of servers.

Z

z/Architecture

An IBM architecture for mainframe computers and peripherals. The IBM e(logo)server zSeries family of servers

uses the z/Architecture architecture. It is the successor to the S/390 and 9672 family of servers. See also iSeries.

z/OS An operating system for the IBM e(logo)server product line that supports 64-bit real storage.

z/OS Global Mirror

A function of a storage server that assists a control program to maintain a consistent copy of a logical volume on another storage unit. All modifications of the primary logical volume by any attached host are presented in order to a single host. The host then makes these modifications on the secondary logical volume. This function was formerly called extended remote copy or XRC.

zSeries

An IBM e(logo)server family of servers that emphasizes near-zero downtime.

IBM enterprise servers based on z/Architecture.

zSeries storage

Storage arrays and logical volumes that are defined in the DS8000 as connected to zSeries servers.

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IBM DS8000 manual Write hit, Write penalty, XSeries, Architecture, OS Global Mirror, ZSeries storage