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copied!<p>Do not forget that ClearCase (<strong>Central</strong> VCS) and Mercurial (<strong>Distributed</strong> VCS) are very different.<br> See <a href="https://stackoverflow.com/questions/645008/what-are-the-basic-clearcase-concepts-every-developer-should-know/645771#645771">Core ClearCase concepts</a> for a full list. </p> <p>In the case of a migration, that means you are dealing with a <em>repository-centric</em> VCS (Mercurial) which implies "working with timelines" (a timeline being a commit, building a new changeset)<br> In ClearCase though, there is no global timeline, as each <em>file</em> is committed individually (file-centric VCS). </p> <p>So for a migration, you need to setup a ClearCase dynamic view with a config spec you will change to list all relevant "ClearCase timelines" (labels for non-UCM views or even better: baselines for UCM views) and import that fixed state into Mercurial.<br> And repeat the process until the most recent label/baseline. </p> <p>The idea is: there is often no need to import the <em>all</em> history of <em>all</em> the files when migrating from ClearCase to another (D)VCS. Only the "significant" changes need to be recorded.<br> I would not recommend the "<a href="http://www.selenic.com/mercurial/wiki/ClearCaseConversion" rel="nofollow noreferrer">Conversion of ClearCase repo to Mercurial</a>" article, especially for large and old ClearCase repositories.</p> <p>See also <a href="https://stackoverflow.com/questions/542479/what-is-the-best-strategy-when-migrating-from-clearcase-to-svn">SVN migration for other considerations</a>.</p>

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