在我的旧回答清理案例到Git迁移（2014），但更一般地说，我会加上（2016）：

ClearCase是集中式的，Vob或UCM组件的大小没有限制（不管是UCM Vob还是UCM Vob中的***文件夹）。

所以，虽然经验法则是一个git repo每个UCM组件，它需要根据该组件的实际特性进行检查。

由于git仓库代表了快照（而不是ClearCase快照） ，但更像ClearCase标签），我只将ClearCase基线导入到git repo中，而不是每个文件的中间版本。基线适用于UCM组件中的全部文件，该文件与git提交更直接。

I wants to migrate projects form CC to Git.
I'm looking for guidelines or recommendation how to do it (not technical methods).
for example, if I have 5 UCM components, do I need to create repository for each component or to create one repository with 5 folders?

I'm familiar with CC methods. Do you have some relevant links?

You have some guidelines in my old answer "ClearCase to Git migration" (2014), but more generally, I would add (2016):

ClearCase being centralized, there is no limit in size for a Vob or even an UCM component (be it an UCM Vob, or a top folder within an UCM Vob).
So while the rule of thumb is one git repo per UCM component, it needs to be checked against the actual characteristic of said component.

Since a git repo represents an history of "snapshots" (not the ClearCase snapshots, but more like ClearCase tags), I only import ClearCase baselines into a git repo, not intermediate versions per files. The baseline applies to all files in an UCM component, which is more inline with git commits.