The IBM Totalstorage Solutions Handbook (IBM Redbooks) by International Business Machines Corporat

The IBM Totalstorage Solutions Handbook (IBM Redbooks) by International Business Machines Corporat

By International Business Machines Corporat

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For the more information regarding RAID concepts, check 'RAID levels' on page 486. 3 ESS advanced copy services The ESS Advanced Copy Services are enterprise-level, leading-edge functions designed to address an organization's needs for disaster recovery, data migration and data duplication. 1 Peer-to-Peer Remote Copy (PPRC) PPRC is a function of a storage server that constantly updates a secondary copy of a volume to match changes made to a primary volume. The primary and the secondary volumes can be on the same storage server or on separate storage servers.

This feature supplies a pair of optical converters that convert electrical SSA signals into optical signals for transmission using optical fibers. This feature allows the maximum distance between SSA nodes to be increased from 25 meters up to 10 kilometers. 3 More information 7133 products are supported in the environments shown in the Web links that follow. Open < Day Day Up > < Day Day Up > Chapter 4: Enterprise Storage Server (ESS) The IBM Total Storage Enterprise Storage Server (ESS) is IBM's most powerful disk storage server, developed using IBM Seascape architecture.

The largest rack (7014-T42) can hold up to fourteen EXP Plus drawers for a total physical capacity of 28 TB. The standalone tower Models TS4/TU3 are ideal for one- or two-server environments, providing up to 2 TB of capacity in a small desk-side tower unit. The rack-mounted DS4/DU3 models and the desk-side tower TS4/TU3 models all can be populated with up to fourteen disk drives. 8 GB) disk drives. Drive capacities can be intermixed and drives can be added in increments as few as one or as many as thirteen.

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