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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Extended Remote Copy</span></span>
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<p><b>Extended Remote Copy</b> or <b>XRC</b> is an <a href="IBM" title="IBM">IBM</a> <a href="ZSeries" class="mw-redirect" title="ZSeries">zSeries</a> and <a href="System_z9" class="mw-redirect" title="System z9">System z9</a> <a href="Mainframe_computer" title="Mainframe computer">mainframe computer</a> technology for <a href="Data_replication" class="mw-redirect" title="Data replication">data replication</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> It combines supported hardware and <a href="Z/OS" title="Z/OS">z/OS</a> software to provide <a href="Asynchronous_replication" class="mw-redirect" title="Asynchronous replication">asynchronous replication</a> over long distances. It is complementary to IBM's <a href="Peer_to_Peer_Remote_Copy" title="Peer to Peer Remote Copy">Peer to Peer Remote Copy</a> (PPRC) service, which is designed to operate either synchronously or asynchronously over shorter distances.
</p><p>XRC as a z/OS copy services solution can be compared to <a href="Global_Mirror" class="mw-redirect" title="Global Mirror">Global Mirror</a> for ESS, which is a controller-based solution for either the open systems or z/Series environments. Both Global Mirror for ESS (Asynchronous PPRC) and XRC (Global Mirror for z/Series) are asynchronous replication technologies, although their implementations are somewhat different.
</p><p>Extended Remote Copy or XRC is now known as Global Mirror for z/Series (XRC).
</p><p>XRC is a z/Series asynchronous disk mirroring technique which is effective over any distance. It keeps the data time consistent across multiple <a href="IBM_Enterprise_Storage_Server" title="IBM Enterprise Storage Server">ESS (Enterprise Storage Server)</a> or HDS (Hitachi Data Systems) disk subsystems at the recovery site.
</p><p>XRC functions as a combination of disk (IBM ESS or HDS licensed) Microcode and application code running on a z/Series host and provides a recovery point that is time consistent across multiple disk subsystems.
</p><p>The host component of the software is called the System Data Mover or SDM. The SDM ensures that no dependent writes are made out of sequence and data residing on the secondary volumes will always provide a time consistent copy of the primary volumes being mirrored.
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<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Peer_to_Peer_Remote_Copy" title="Peer to Peer Remote Copy">Peer to Peer Remote Copy</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.ibm.com/docs/en/zos/3.1.0?topic=xrc-overview-extended-remote-copy">"Overview of extended remote copy (XRC)"</a>. <i>IBM</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2025-05-31</span></span>.</cite></span>
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This article is issued from <a class="external text" title="Last edited on 2025-06-01" href="https://en.wikipedia.org/wiki/?title=Extended_Remote_Copy&oldid=1293344401">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.
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