EMC CX500I Configuration Guide - Page 66

with its source., which unfractures the clone and updates the contents on the clone

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Data Replication and Data Mobility Software Clone private LUNs record information that identifies data chunks on the source LUN and clone LUN that have been modified after you fractured the clone. A modified data chunk is a chunk of data that a host changes by writing to the clone or source LUN. A log in the clone private LUN records this information, but no actual data is written to the clone private LUN. This log reduces the time it takes to synchronize or reverse synchronize a clone and its source LUN since the software copies only modified (changed) chunks. Host I/O requests made to the source LUN are copied to the fractured clone only when you manually perform a synchronization, which unfractures the clone and updates the contents on the clone with its source. Figure 4-1 shows an example of how a fractured clone works. Note, as the production host writes to the source LUN, and the second host writes to the clone, the clone private LUN records information that identifies these writes. Production Host Second Host Continuous I/O Storage System Source LUN Fractured Clone LUN CPL Figure 4-1 Clones Example EMC2438 4-4 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide

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4-4
EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide
Data Replication and Data Mobility Software
Clone private LUNs record information that identifies data chunks
on the source LUN and clone LUN that have been modified after you
fractured the clone. A modified data chunk is a chunk of data that a
host changes by writing to the clone or source LUN. A log in the
clone private LUN records this information, but no actual data is
written to the clone private LUN. This log reduces the time it takes to
synchronize or reverse synchronize a clone and its source LUN since
the software copies only modified (changed) chunks.
Host I/O requests made to the source LUN are copied to the
fractured clone only when you manually perform a synchronization,
which unfractures the clone and updates the contents on the clone
with its source.
Figure 4-1 shows an example of how a fractured clone works. Note,
as the production host writes to the source LUN, and the second host
writes to the clone, the clone private LUN records information that
identifies these writes.
Figure 4-1
Clones Example
Second
Host
Source
LUN
Fractured
Clone LUN
Storage System
Continuous I/O
CPL
EMC2438
Production
Host